Today's Message Index:
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1. 06:30 AM - Re: Re: Off Field Landing (Clive James)
2. 07:27 AM - Re: Off Field Landing (Charles Deiterich)
3. 02:20 PM - Re: Off Field Landing (Tim Juhl)
4. 11:26 PM - Re: Re: Off Field Landing (Clive James)
Message 1
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| Subject: | Re: Off Field Landing |
I recently had to fit new magnets. The metalwork that houses them is machined vary
accurately as is the recess that they sit in. The screws that hold them in
the recess are mickey mouse alloy and easy to trash when taking out so care needs
to be taken. They did seem to do their job well and werent coming out easily.
My impression of the set up was a good solid installation.
Hearing Bobbys story, well done from me also, I agree closing the gap below spec
is something we should avoid. Might not be the cause but if coils and magnets
collide then it seems to get very messy.
BR, CJ
> On 14 Dec 2014, at 01:14, Tim Juhl <timjuhl@frontier.com> wrote:
>
>
> Bobby,
> You did one heck of a fine job getting that airplane down. You've got the right
stuff my friend!
>
> I'm curious if anything like this has happened to anyone before. Also, as others
have pointed out, the coincidence of the coil air gap change and the failure
makes one wonder. Did the Magnet come loose and hit the coil or vice versa?
>
> Living in Michigan, I was planning to change my gap to .008 but right now I'm
not so sure.
>
> Keep us updated if you learn any more.
>
> Tim
>
> --------
> ______________
> CFII
> Champ L16A flying
> Zodiac XL - Jabiru 3300A
> Almost done! It'll fly in spring!
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=435697#435697
>
>
>
>
>
>
>
>
>
>
Message 2
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| Subject: | Re: Off Field Landing |
Tim,
In 2002 my 2200, sn 988, came with the mag gaps set at .025".=C2- I had t
wo 6 volt lawnmower batteries in series (now have a 12 V Odyssey).=C2- A
bit low on power, but they started it ok above 60 F.=C2- Below 60 F was m
arginal.=C2- Pete said gap them at .010".=C2- But I just went to .016"
and when the prop spun fast it would start even at 40 F. Pre heating helped
below 40 F.=C2- One of my magnets is a bit closer than the other, I gap
using the closest one.=C2- Using .016" work fine for me, I would be cauti
ous going to .008 inches.
My 2 cents worth.Chuck D.N701TX
Message 3
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| Subject: | Re: Off Field Landing |
As Bobby pointed out, having the coils and magnets collide can ruin your day.
It is fortunate for him that he kept his cool and did an outstanding job of getting
the airplane down in one piece. As an old CFI, I can tell you that when
I do a simulated engine failure on a BFR, about half the pilots sit there waiting
for me to tell them what to do next..... scary!
I'm going to leave the coils at 0.010 - I'm also going to check the clearance on
all the magnets just to see how consistent they are. If the magnet screws are
as Clive describes it probably wouldn't be a great idea to try tightening them
periodically.....
Here in Michigan, I preheat below 40 anyway - not only is it easier to start an
engine but I believe it cuts down on internal wear. I use a portable electric
heater blowing into a piece of dryer hose. I plug it in, go to town for a coffee
and by the time I get back it is ready to go :-)
Clive, I wonder why you had to fit new magnets?
Tim
--------
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=435719#435719
Message 4
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| Subject: | Re: Off Field Landing |
'Clive, I wonder why you had to fit new magnets?
So do I, I had the engine apart for the lifter downgrade and then had trouble starting
it. After some messing with the timing, I convinced myself I had inadvertently
moved it, I realised the ignition magnets were weak (bolt pull test).
Why?, I dont know, was careful with the handling of the flywheel, to was stored
in the roof of my garage for a few months. Maybe I dropped it but I dont recall.
Anyhow, that picture of the bolt test I have seen in the manual for years
is what showed me the problem, didnt need a spring balance just compared it
to a nearby 2200. Alternator magnets Ok and output as high as ever.
Strange one, I would suggest real paranoia with flywheel handing..
Regards, Clive
2200+3300 in UK
> On 14 Dec 2014, at 22:20, Tim Juhl <timjuhl@frontier.com> wrote:
>
>
> As Bobby pointed out, having the coils and magnets collide can ruin your day.
It is fortunate for him that he kept his cool and did an outstanding job of
getting the airplane down in one piece. As an old CFI, I can tell you that when
I do a simulated engine failure on a BFR, about half the pilots sit there waiting
for me to tell them what to do next..... scary!
>
> I'm going to leave the coils at 0.010 - I'm also going to check the clearance
on all the magnets just to see how consistent they are. If the magnet screws
are as Clive describes it probably wouldn't be a great idea to try tightening
them periodically.....
>
> Here in Michigan, I preheat below 40 anyway - not only is it easier to start
an engine but I believe it cuts down on internal wear. I use a portable electric
heater blowing into a piece of dryer hose. I plug it in, go to town for a coffee
and by the time I get back it is ready to go :-)
>
> Clive, I wonder why you had to fit new magnets?
>
> Tim
>
> --------
> ______________
> CFII
> Champ L16A flying
> Zodiac XL - Jabiru 3300A
> Almost done! It'll fly in spring!
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=435719#435719
>
>
>
>
>
>
>
>
>
>
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