Today's Message Index:
----------------------
1. 02:03 AM - Re: Rotax starting - 912S (nigel charles)
2. 03:20 AM - Re: Rotax starting - 912S (William Mills)
3. 07:49 AM - Paint booth story (Dave Anderson)
4. 08:19 AM - Re: Paint booth story (Paul Boulet)
5. 11:02 AM - Re: Rotax starting - 912S (Ami McFadyean)
6. 11:06 AM - Painting and products cont. (Erich Trombley)
7. 11:36 AM - Re: Rotax starting - 912S (P.A.D.Clarke)
8. 12:57 PM - Re: FRIDAY-HAT DROPPING-NORTH WEALD (bryan allsop)
9. 01:17 PM - Re: Rotax starting - 912S (James H Nelson)
10. 01:55 PM - Flap Jig Alignment (David Simenauer)
11. 02:42 PM - Re: Rotax starting - 912S (Rowland Carson)
12. 03:12 PM - Re: Flap Jig Alignment (Stephan Cassel)
13. 03:33 PM - Re: Paint booth story (n3eu@comcast.net)
14. 04:27 PM - Re: Rotax starting - 912S (Ami McFadyean)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Rotax starting - 912S |
--> Europa-List message posted by: "nigel charles" <nigelcharles@tiscali.co.uk>
>By the way, I'm having ENORMOUS problems with hot starting at the moment,
which doesn't seem to be related to any of the related issues discussed at
length on this and parallel forums. Hope its not another symptom of the
clutch problem (there's no banging and shaking, just no firing at all). Any
ideas out there?<
Perhaps it might be fuel vapourisation. I have a fuel temperature gauge
which measures temperature at the carb inlet and the temperature jumps up by
about 10degC within 5 minutes after shutdown. I leave the inspection panels
open during short turnarounds which helps cool the engine compartment
significantly. If it is fuel related then a check of a plug after several
start attempts will show a dry plug.
Nigel Charles
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Rotax starting - 912S |
--> Europa-List message posted by: "William Mills" <combined.merchants@virgin.net>
Hi Duncan
My 912 is also difficult to start when it is still hot. I assume it is to do
with
the temperature of the carbs. On such occasions I run the fuel pump for
much longer and then when the engine is turning over and won't fire I
progressively open the throttle until it catches, which is usually about 1/3
to 1/2 throttle. Obviously no choke.
Best wishes,
William
----- Original Message -----
From: "Ami McFadyean" <ami@mcfadyean.freeserve.co.uk>
Subject: Re: Europa-List: Rotax starting - 912S
> --> Europa-List message posted by: "Ami McFadyean"
<ami@mcfadyean.freeserve.co.uk>
>
> How is it that the higher power starter motor does not put a higher load
on
> the sprag clutch, which would lead to the earlier demise of the clutch?
This
> assumes that the clutch is the victim rather than the cause, which seems
to
> be the case.Or is it that the violent starting (and the 'standard' but
less
> violent stopping) is the sole cause?
>
> Many of the other factors that Rotax list as "remedies" would seem to be
> appropriate in the first instance and there must be a compromise somewhere
> between spinning the motor fast enough to generate a good spark etc and
> spinning it excessively fast.
>
> By the way, I'm having ENORMOUS problems with hot starting at the moment,
> which doesn't seem to be related to any of the related issues discussed at
> length on this and parallel forums. Hope its not another symptom of the
> clutch problem (there's no banging and shaking, just no firing at all).
Any
> ideas out there?
>
> Duncan McF.
> ----- Original Message -----
> From: "P.A.D.Clarke" <paddyclarke@lineone.net>
> To: <europa-list@matronics.com>
> Subject: Re: Europa-List: Rotax starting - 912S
>
>
> > --> Europa-List message posted by: "P.A.D.Clarke"
> <paddyclarke@lineone.net>
> >
> > Hi Folks,
> > A bit more on the sprag clutch. It seems to be a problem
> > particularly on the higher compression 912S, but I know of one higher
hour
> > 912 that's affected, so presumably all Rotax engines may eventually be
> > vulnerable. The symptoms have been well described in previous messages,
> but
> > can be positively diagnosed as the sprag clutch using a clamp meter.
Rotax
> > SB-912-042 refers.
> > A clamp meter can be bought ( in the U.K.) for approx.
90
> > pounds from Maplin, tho' I think this could well be a candidate for a
tool
> > for the club to own and hire out. Note that it has to be able to measure
> > DC current.
> > The other thing that is worth checking is the friction
> > torque in the gearbox - again SB-912-042 refers.
> > As David says, Adrian Lloyd at Shobdon did the fix for
> me,
> > and, as I have an XS with the greater clearance behind the engine, he
> > managed to do it with the engine in place. Whether this will be possible
> on
> > the classic I don't know. Adrian also fitted the high power starter
motor
> > ( amazing difference - amazing price! ) as he is convinced it will help
to
> > stop the problem reoccurring. Again, I have heard that this may not be
> > possible on the classic due to the restricted space.
> > It seems that once the problem starts it will only get
> > worse, and as the symptoms are so unpleasant, causing great concern as
to
> > what is being done to the engine mounts, crankcase, prop, etc., delaying
a
> > fix would appear unwise. I can't recommend Adrian highly enough.
> > Cheers, Paddy Clarke
> > ----- Original Message -----
> > From: <RMRRick@aol.com>
> > To: <europa-list@matronics.com>
> > Subject: Re: Europa-List: Rotax starting - 912S
> >
> >
>
>
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
"Anderson, Don" <dcalei@aol.com>
| Subject: | Paint booth story |
--> Europa-List message posted by: "Dave Anderson" <dja767@charter.net>
Thanks to Erich for the detailed rendition of his painting experience. Sounds like
it can be done by a builder - andn done well!
Here is a fascinating story if any one has input for me, I'd appreciate it. I built
a booth of 2X2 lumber and plastic sheeting left over from my previous painting
experience with water based paint. I was experimenting with a box fan for
ventilating. I had decided to have the major parts sprayed by the local painter
and do the small parts myself. I decided after looking at the lighting that
I would not use it as a paint booth, but as a drying dust free booth. I would
paint the parts outside early in the morning and transfer them into the booth.
I have a privately owned hangar on airport property.
When I entered the hangar yesterday, I found the paint booth violently slashed
to bits. That is the only way I can describe it without pictures. I literally
stood there for minutes staring - literally scared that my hangar had been vandalized.
The immediate concern was for the radios and other expensive equipment,
as well as the airplanes themselves. After the shock wore off, I went to the
airport manager's office and called the police. As it turns out, the local county
fire inspector entered my hangar to do an inspection and decided to destroy
my property in the way I described! There was no notice, there was nothing
left to indicate what had been done or who had done it. Needless to say, I am
in a state of shock seeing the government employee (who is paid by my taxes)
acting as judge, jury and executioner. The remarkable thing is I did not intend
to use it as a paint booth and was only experimenting with ideas - lighting
etc. On top of it, they tell me that I will be receiving a citation for having
an illegal paint booth.
I will be consulting a lawyer regarding this, obviously. Does anyone out there
have any experience in such matters. It seems to me that I was denied my right
of due process - never having a chance to explain the situation before the big
arm of the law came down and passionately destroyed what I had created. I think
I'll post a picture on my web site - a picture tells a thousand words.
More windmills to tilt at!
Dave
A227 Mini U2
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Paint booth story |
--> Europa-List message posted by: Paul Boulet <possibletodo@yahoo.com>
My sincere empathy to you. Too often Firemen and other gov't employees think they're
God. Wish I knew the answer... best of luck with the lawyer... keep us
posted what happens
Paul Boulet N914PB
test flight scheduled week of May 3, 2004!!!!!
Dave Anderson <dja767@charter.net> wrote:
--> Europa-List message posted by: "Dave Anderson"
Thanks to Erich for the detailed rendition of his painting experience. Sounds like
it can be done by a builder - andn done well!
Here is a fascinating story if any one has input for me, I'd appreciate it. I built
a booth of 2X2 lumber and plastic sheeting left over from my previous painting
experience with water based paint. I was experimenting with a box fan for
ventilating. I had decided to have the major parts sprayed by the local painter
and do the small parts myself. I decided after looking at the lighting that
I would not use it as a paint booth, but as a drying dust free booth. I would
paint the parts outside early in the morning and transfer them into the booth.
I have a privately owned hangar on airport property.
When I entered the hangar yesterday, I found the paint booth violently slashed
to bits. That is the only way I can describe it without pictures. I literally
stood there for minutes staring - literally scared that my hangar had been vandalized.
The immediate concern was for the radios and other expensive equipment,
as well as the airplanes themselves. After the shock wore off, I went to the
airport manager's office and called the police. As it turns out, the local county
fire inspector entered my hangar to do an inspection and decided to destroy
my property in the way I described! There was no notice, there was nothing
left to indicate what had been done or who had done it. Needless to say, I am
in a state of shock seeing the government employee (who is paid by my taxes)
acting as judge, jury and executioner. The remarkable thing is I did not intend
to use it as a paint booth and was only experimenting with ideas - lighting
etc. On top of it, they tell me that I will be recei!
ving a citation for having an illegal paint booth.
I will be consulting a lawyer regarding this, obviously. Does anyone out there
have any experience in such matters. It seems to me that I was denied my right
of due process - never having a chance to explain the situation before the big
arm of the law came down and passionately destroyed what I had created. I think
I'll post a picture on my web site - a picture tells a thousand words.
More windmills to tilt at!
Dave
A227 Mini U2
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Rotax starting - 912S |
--> Europa-List message posted by: "Ami McFadyean" <ami@mcfadyean.freeserve.co.uk>
Could well be related to heat; the inlet manifolds have been hot and cold
starting remains easy. However, fuel IS getting through because fuel vapour
can be seen "puffing" out of the exhaust pipe. If it's too much fuel, then
trying to dry out by cranking at full throttle doesn't help (and probably
wouldn't anyway with CD-type carbs.). Can't see why over hot fuel would be a
problem, so long as its still present as a vapour rather than as a 'gas'.
Maybe it has something to do with winter MOGAS; other forums have recorded
that these problems are eased by use of AVGAS. Also, inlet air is taken from
under the cowl, which would exacerbate a heat-related problem.
Duncan McF.
----- Original Message -----
From: "nigel charles" <nigelcharles@tiscali.co.uk>
Subject: Re: Europa-List: Rotax starting - 912S
> --> Europa-List message posted by: "nigel charles"
<nigelcharles@tiscali.co.uk>
>
> >By the way, I'm having ENORMOUS problems with hot starting at the moment,
> which doesn't seem to be related to any of the related issues discussed at
> length on this and parallel forums. Hope its not another symptom of the
> clutch problem (there's no banging and shaking, just no firing at all).
Any
> ideas out there?<
>
> Perhaps it might be fuel vapourisation. I have a fuel temperature gauge
> which measures temperature at the carb inlet and the temperature jumps up
by
> about 10degC within 5 minutes after shutdown. I leave the inspection
panels
> open during short turnarounds which helps cool the engine compartment
> significantly. If it is fuel related then a check of a plug after several
> start attempts will show a dry plug.
>
> Nigel Charles
>
>
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Painting and products cont. |
--> Europa-List message posted by: Erich Trombley <erichdtrombley@juno.com>
Fred and others,
Regarding the clear coat. It too is manufactured by Acry-Glow and therefore compatible
with their base coat. The sanding the base coat prior to the application
of the clear coat is permissible provided you do not sand any finer than 1,000
grit, due to possible loss of adhesion. 800 grit might be acceptable although
you run the risk of seeing sanding marks in the final finish. To my knowledge
there has not been a problem using Acry-Glow base and clear coat as per
the manufacture.
Fred writes
"I'd advise doing that only if paint mfr says it's OK. One major paint mfr says
clear over base within so many hours, else trouble. I tried what you did
once, but the clear failed in about 5 years, just like the mfr said it might."
The Sherwin-Williams rep stated that if the clear coat is not applied within so
many hours you will need to sand the base coat prior to the application of the
clear. This is just what I did with my project.
"I'd like to add that the paints you cited are available from the major mfr's as
automotive coatings, and I think it's a stretch to say one brand is superior
for our purposes nor has much changed, based on many I've used periodically since
1960. Also, I've tried to find product literature that says what's really
special about their "aerospace coatings." Only luck so far is the military
cites problems with leading edge abrasion (from dust) on supersonic aircraft,
and the Space Shuttle gets hit with major UV."
Fred, I do not profess to be a painting expert as pointed out this is my first
painting exercise. However, I can personally attest to the fact that at least
one automotive coating I saw on a Velocity was not chemically resistant to Avgas
and left a nasty permanent blue stain around the fuel caps where fuel had
come in contact with the paint.
Sherwin-Williams list the following benefits to their product:
Easy application and fast dry
Resistant to chipping and UV exposure
Long-lasting, high-gloss finish
Superior Skydrol and other hydraulic jet fluid resistance
Salt, chemical and solvent resistant
Available in High Solids and Conventional formulations
Unlimited color availability
I can also attest to the fact that the paint is extremely flexible, a desired characteristic
since there is significant flexing in aircraft. I also know that
many Jet manufactures use this product on their aircraft, which cost a fair
bit more than a Europa.
You can do as you wish, I simple stated the process and products I have used on
my bird, as have others, with the desired affect and longevity we all seek.
For those interested the PPG K36 and K201 can be purchased at most automotive paint
houses. The Acy-Glow base and clear in conventional formulation (not the
High Solids) along with the reducer and thinner was purchased from a Sherwin-Williams
distributor:
Custom Chemical Engineering
Aerospace Coatings of Lincoln
4817 N. 56th St., #10
Lincoln, NE 68504
(888) 258-8619
(402) 466-8958 Fax
E-mail: paint4mike@aol.com
Ask for Mike. Also if you have them ship it look into Fed Ex ground vs. Fed Ex
Trucking. There is a big, big difference in the shipping cost as I have found
out the hard way, at least for small orders. I had to order an extra gallon
of clear and the shipping exceeded the cost of the product. For my initial order
I picked it up directly from the distributor as I happened to be in the area.
What ever method and products you all chose to go with I wish you all the best.
Erich Trombley
N28ET Mono-Classic 914
Las Vegas, NV
Message 7
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Rotax starting - 912S |
--> Europa-List message posted by: "P.A.D.Clarke" <paddyclarke@lineone.net>
Hi All,
First a word of caution. I'm not an engineer and don't have
any specialist knowledge. What I have to say may well be ( and probably is )
a load of old rubbish. Having said that, I'll press on anyway.
The problem seems to arise when the engine kicks back on
start up. The poor little starter motor turning one way meets the engine
violently kicking back the other. The location for this titanic conflict is
the sprag clutch - no wonder it can't cope. The higher output starter spins
the engine so fast that there is plenty of inertia to carry it over the
compression, whenever ignition takes place. This is how it feels anyway.
I agree that the higher power starter will put greater
torque into the clutch, but I suspect the increased forces are relatively
small compared to those involved in meeting a backfiring engine. I shudder
to think what it would feel like to have a kick back against the high power
starter.
Cheers, Paddy Clarke
ps. I hope this message doesn't appear twice - we had a power cut just as it
was being sent!
----- Original Message -----
From: "Ami McFadyean" <ami@mcfadyean.freeserve.co.uk>
Subject: Re: Europa-List: Rotax starting - 912S
> --> Europa-List message posted by: "Ami McFadyean"
<ami@mcfadyean.freeserve.co.uk>
>
> How is it that the higher power starter motor does not put a higher load
on
> the sprag clutch, which would lead to the earlier demise of the clutch?
This
> assumes that the clutch is the victim rather than the cause, which seems
to
> be the case.Or is it that the violent starting (and the 'standard' but
less
> violent stopping) is the sole cause?
Message 8
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: FRIDAY-HAT DROPPING-NORTH WEALD |
--> Europa-List message posted by: "bryan allsop" <info@blackballclub.fsnet.co.uk>
The weather man nearly got it right for Friday. It should be almost balmy at
North Weald, but a front will be running SW to NE through Manchester which
will cause cloud and rain along its' line.
For those SE of the line the weather looks promising, so I hope that the
lure of bacon butties together with the nostalgic promise of North Weald
will be sufficient to make it worth a go.
Happy flying. Bryan A
Message 9
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Rotax starting - 912S |
--> Europa-List message posted by: James H Nelson <europajim@juno.com>
Duncan,
When I flooded my 912S last time, I shut off the main fuel
(valve) and opened the throttle about half way. Then I cranked the
engine and it cleared and started. The moment it started, I turned the
fuel selector back to on and all was fine. Previously I had to let it
set until it cleared itself usually several hours later. That solution
was not acceptable. So the next time it floods, I will do the shut off
of fuel and things should be fine. I've only flooded it three times in
the past 18 mo. but that is three times too many. It was also very
embarrassing as I was giving flight to a first timer----
Jim Nelson
Message 10
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Flap Jig Alignment |
--> Europa-List message posted by: "David Simenauer" <dsimenauer@cox.net>
I have just started on the flaps. On both sides, when the flap cores are set upside
down in the jigs, the jig for the outboard piece is slightly thicker, maybe
by 2 or 3 mm, than the jig for the outboard piece. Therefore when I press
the cores together with the 5 mm foam laminate in between, the foam cores do
not line up. Is this correct, or is it a manufacturing error? I could shim
up the low side but I am afraid this will distort the shape of the flap.
Dave Simenauer
A101
Message 11
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Rotax starting - 912S |
--> Europa-List message posted by: Rowland Carson <rowil@clara.net>
At 2004 04 12 11:54 +0100 David Corbett wrote:
>what's A3800 in a currency I can understnd
David - "A3" appearing in an e-mail message usually means a UK pound
sign was originally typed in that position - so A3800 would be 800 UK
pounds. The problem arises because the basic ASCII character set does
not include the appropriate fancy "L" (for libra) symbol. UK
keyboards often have a pound sign where US ones have the hash sign
(US usage often treats this # as equivalent to "pound" or "number").
regards
Rowland
--
| Rowland Carson PFA #16532 <http://home.clara.net/rowil/aviation/>
| 670 hours building Europa #435 G-ROWI e-mail <rowil@clara.net>
Message 12
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Flap Jig Alignment |
--> Europa-List message posted by: "Stephan Cassel" <cassel@sensewave.com>
Hi Dave,
That was also the case when I did my flaps.
I put some mixing sticks and tape has shims. The key thing
here is that the flap is straight. I used a long straight edge
and checked both LE, TE and the surface between.
Tripple check that you have correct washout.
Regards
Stephan Cassel
#556 Norway
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of David
Simenauer
Subject: Europa-List: Flap Jig Alignment
--> Europa-List message posted by: "David Simenauer"
<dsimenauer@cox.net>
I have just started on the flaps. On both sides, when the flap cores
are set upside down in the jigs, the jig for the outboard piece is
slightly thicker, maybe by 2 or 3 mm, than the jig for the outboard
piece. Therefore when I press the cores together with the 5 mm foam
laminate in between, the foam cores do not line up. Is this correct,
or is it a manufacturing error? I could shim up the low side but I am
afraid this will distort the shape of the flap.
Dave Simenauer
A101
==
==
==
==
Message 13
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Paint booth story |
--> Europa-List message posted by: n3eu@comcast.net
Dave Anderson wrote:
>...
> Does anyone out there have any experience in such matters.
> It seems to me that I was denied my right of due process...
My experience is as long-time officer in our Airport Association, so at
least much exposure to general legal rules of airport life. Before you
potentially waste money on an attorney, wait to see if them's on a
testosterone high actually do anything. Even though a "privately-owned
hangar," if the airport is gov't owned or managed, there can be a legal
link-chain via a "shotgun" ordinance, airport rules and regs, land lease
arrangements with building owners, and thence space lease to you, if the
case.
Result in the end is that anyone merely setting foot on airport property
has to behave like good little kiddies. :-) Also, fergit the "due process"
stuff! Fourth Amendment issues have practical relevance in minor civil
matters primarily in debates over evening pitchers of beer by 1st-year law
students. What really matters in civil law is economic harm, sounds like so far
just some poly sheeting...?
Do not archive
Reg,
Fred F.
Message 14
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Rotax starting - 912S |
--> Europa-List message posted by: "Ami McFadyean" <ami@mcfadyean.freeserve.co.uk>
That being so, the 'shaking and banging' is likely caused by the low
frequency primary resonance (torsional and/or blade-flap) that is inevitably
present below normal cranking speeds. In the absence of any damping, the
forces produced by resonance will build-up towards infinity. The crank and
gearbox get hit with similar forces too; its just that the sprag is the weak
link in the chain (and, if it's any consolation, cheaper than a new crank!).
However, damping of resonance is provided by the friction clutch in the
gearbox; hence Rotax's insistence that this be maintained at the upper
limit. Also anything that accelerates the cranking engine quickly through
and clear of the resonant band should help (i.e. powerful battery, good
contacts, high torque motor). We have to hope that it is the 'shaking and
banging' ONLY that causes the problem, not the loads of normal starting.
Last Summer, there was a certain 912S CT that was regularly shaking the
carburettors out of the mounting sockets on start up, possibly exacerbated
by the big floppy 2-blade prop it had.
Duncan McF.
----- Original Message -----
From: "P.A.D.Clarke" <paddyclarke@lineone.net>
Subject: Re: Europa-List: Rotax starting - 912S
> --> Europa-List message posted by: "P.A.D.Clarke"
<paddyclarke@lineone.net>
>
> Hi All,
> First a word of caution. I'm not an engineer and don't
have
> any specialist knowledge. What I have to say may well be ( and probably
is )
> a load of old rubbish. Having said that, I'll press on anyway.
> The problem seems to arise when the engine kicks back on
> start up. The poor little starter motor turning one way meets the engine
> violently kicking back the other. The location for this titanic conflict
is
> the sprag clutch - no wonder it can't cope. The higher output starter
spins
> the engine so fast that there is plenty of inertia to carry it over the
> compression, whenever ignition takes place. This is how it feels anyway.
> I agree that the higher power starter will put greater
> torque into the clutch, but I suspect the increased forces are relatively
> small compared to those involved in meeting a backfiring engine. I shudder
> to think what it would feel like to have a kick back against the high
power
> starter.
> Cheers, Paddy Clarke
> ps. I hope this message doesn't appear twice - we had a power cut just as
it
> was being sent!
> ----- Original Message -----
> From: "Ami McFadyean" <ami@mcfadyean.freeserve.co.uk>
> To: <europa-list@matronics.com>
> Subject: Re: Europa-List: Rotax starting - 912S
>
>
> > --> Europa-List message posted by: "Ami McFadyean"
> <ami@mcfadyean.freeserve.co.uk>
> >
> > How is it that the higher power starter motor does not put a higher load
> on
> > the sprag clutch, which would lead to the earlier demise of the clutch?
> This
> > assumes that the clutch is the victim rather than the cause, which seems
> to
> > be the case.Or is it that the violent starting (and the 'standard' but
> less
> > violent stopping) is the sole cause?
>
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|