Today's Message Index:
----------------------
1. 05:37 AM - Replace 582 with 912 (alienwes)
2. 05:47 AM - Re: Replace 582 with 912 (John Hauck)
3. 07:38 AM - wiring 912 uls (frank goodnight)
4. 07:46 AM - Re: Newbie Question - Kolb MK III Extra or Kolb IV (Steve Simmons)
5. 08:05 AM - Re: wiring 912 uls (b young)
6. 08:34 AM - Re: corvair news (Richard Pike)
7. 08:58 AM - Fw: 912 elect (b young)
8. 09:33 AM - Re: Fw: 912 elect (Herb Gayheart)
9. 10:31 AM - Re: Fw: 912 elect (John Hauck)
10. 11:11 AM - Re: Fw: 912 elect (Herb Gayheart)
11. 11:13 AM - Re: Fw: 912 elect (Herb Gayheart)
12. 11:17 AM - Re: Fw: 912 elect (Herb Gayheart)
13. 01:23 PM - Aileron trim-drag question (Kirby, Dennis Civ USAF AFMC AFNWC/ENS)
14. 01:33 PM - Re: Aileron trim-drag question (John Hauck)
15. 01:34 PM - Re: Aileron trim-drag question (Richard Girard)
Message 1
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| Subject: | Replace 582 with 912 |
Was wondering how hard it would be to replace a 582 with a 912 on a Mark III?
Just curious as to the level of difficulty....
--------
Wesley Elliott
Sport Pilot-PPC
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=392415#392415
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| Subject: | Replace 582 with 912 |
Was wondering how hard it would be to replace a 582 with a
912 on a Mark III?
Just curious as to the level of difficulty....
--------
Wesley Elliott
The 912 and 582 bolt up the same.
Kolb Aircraft can provide parts and technical advice.
I initially powered my mkIII with a 582, then repowered with
912. Was a little more difficult to transition back then.
We had to design engine mounts, radiator and oil cooler
mounts, exhaust system, and reverse throttle control
geometry. The 582 pulls throttle open. The 912 pulls
throttle closed.
Was worth the effort.
john h
mkIII
Woodville, FL
Message 3
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Need help understanding the 912 uls generating sys.
looking at page 17-1 fig 29 of the rotax install manual. I need to know if i can
check for voltage between one of the yellow (ge) wires and ground, or between
the two yellow wires , and if so what should the voltage be.
What does the 2,5 and a little square box repesent
in the wires going to the G terminals on the rectifier?
What is # 11 in fig 29 if it is a diode , what kind and where can i find one.
my engine was removed from a wrecked plane and i don't
think the hookup used the capaciator or whatever #11 is
that is shown in fig 29. thanks to anyone that can help me.
Frank Goodnight
Message 4
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| Subject: | Newbie Question - Kolb MK III Extra or Kolb IV |
Just as a thought I have owned a Kit Fox and a Mark IIIC. As for as SAFETY
goes the Kolb has it all over the Kit Fox. However I would suggest you fly
both of them before you make your decision.
-----Original Message-----
From: owner-kolb-list-server@matronics.com
[mailto:owner-kolb-list-server@matronics.com] On Behalf Of DGaudette
Sent: Tuesday, January 15, 2013 9:20 PM
Subject: Kolb-List: Newbie Question - Kolb MK III Extra or Kolb IV
Hello.
I'm a former Glider/G.A./Gyro pilot looking to get a taildragger. I'm
considering both a Kolb MK III Extra AND a Kitfox IV. I just can't find
anywhere where someone has compared the two.
Any advice?
I'm specifically looking at the KF, Kolb or Avid because when I owned a
Gyroplane, I trailered it to/from my local airport 3 miles away. I kept it
in my barn and avoided hanger fees etc.
Any thoughts folks?
Thanks.
Doug
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=392391#392391
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| Subject: | Re: wiring 912 uls |
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| Subject: | Re: corvair news |
Fascinating read. Thanks for that.
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
richard (at) bcchapel(dot)org
Kingsport, TN 3TN0
Now faith is the substance of things hoped for, the evidence of things not seen.
Hebrews 11:1
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=392438#392438
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frank contacted me direct and said that only the header came through to
me. so I shot this back to him direct.
From: b young
Sent: Wednesday, January 16, 2013 9:48 AM
Subject: Re: 912 elect
I think some how my computer don=99t like forwarding the graphics
in your post.
this was my reply
boyd
Need help understanding the 912 uls generating sys.
looking at page 17-1 fig 29 of the rotax install manual. I need to
know if i can check for voltage between one of the yellow (ge) wires and
ground, or between the two yellow wires , and if so what should the
voltage be.I would measure from yellow to yellow.... not sure but I
think if there is a yellow to ground voltage, there may be a short. I
would think the voltage would change with the rpm... but should be
greater than 14 v probably around 18 V ac or there about. the
regulator/rectifier will convert from ac to dc at the proper charge
voltage for the battery. my eis showes 13.8 v dc.
What does the 2,5 and a little square box repesent
in the wires going to the G terminals on the rectifier?I am
thinking, the 2.5@ is the wire size,, EG:2.5 mm squared the battery to
the starter motor is 16 @ or 16 mm squared
What is # 11 in fig 29 if it is a diode , what kind and where can
i find one. it is a 3 W 12 V charge indicating lamp
my engine was removed from a wrecked plane and i don't
think the hookup used the capaciator or whatever #11 is
that is shown in fig 29. thanks to anyone that can help me. I did
not use the charge indicator lamp.. the eis shows battery voltage.. but
I did use the capacitor shown as item (10) in the diagram between B+ and
ground
Frank Goodnight boyd young mkiii utah hope this helps
Message 8
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| Subject: | Re: Fw: 912 elect |
Same as the yellow wires on other Rotaxing
engines.. the two yellow wires are the
alternator output...AC , whose frequency varies
with rpm's. There should be no short to ground
when measuring each yellow wire..
The case of the regulator can be ground or
there can be a black wire coming out for
ground...Red is positive 13.8 or there bouts...
The AC input voltage to the regulator can be
quite high..though I have never measured
it.. This info based on two cycle engines...should be the same for others..
Herb
At 10:51 AM 1/16/2013, you wrote:
>frank contacted me direct and said that only the
>header came through to me. so I shot this back to him direct.
>
>From: <mailto:byoungplumbing@gmail.com>b young
>Sent: Wednesday, January 16, 2013 9:48 AM
>To: <mailto:frank.goodnight@att.net>frank goodnight
>Subject: Re: 912 elect
>
>I think some how my computer don=99t like
>forwarding the graphics in your post.
>this was my reply
>boyd
>Need help understanding the 912 uls generating sys.
>looking at page 17-1 fig 29 of the rotax install
>manual. I need to know if i can check for
>voltage between one of the yellow (ge) wires and
>ground, or between the two yellow wires , and if
>so what should the voltage be.I would measure
>from yellow to yellow.... not sure but I think
>if there is a yellow to ground voltage, there
>may be a short. I would think the voltage would
>change with the rpm... but should be greater
>than 14 v probably around 18 V ac or there
>about. the regulator/rectifier will convert from
>ac to dc at the proper charge voltage for the battery. my eis showes 13.8 v
dc.
>What does the 2,5 and a little square box repesent
>in the wires going to the G terminals on the
>rectifier?I am thinking, the 2.5@ is the wire
>size,, EG:2.5 mm squared the battery to the
>starter motor is 16 @ or 16 mm squared
>What is # 11 in fig 29 if it is a diode , what
>kind and where can i find one. it is a 3 W 12 V charge indicating lamp
>my engine was removed from a wrecked plane and i don't
>think the hookup used the capaciator or whatever #11 is
>that is shown in fig 29. thanks to anyone that
>can help me. I did not use the charge indicator
>lamp.. the eis shows battery voltage.. but I did
>use the capacitor shown as item (10) in the diagram between B+ and ground
>Frank Goodnight boyd young mkiii utah hope this helps
>
Message 9
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Herb:
I am away from home and my manuals. The reg/rec for the 912 series
engines are similar, but also quite different from the 2 stroke Rotax
engines.
john h
mkIII
Woodville, FL
From: owner-kolb-list-server@matronics.com
[mailto:owner-kolb-list-server@matronics.com] On Behalf Of Herb Gayheart
Sent: Wednesday, January 16, 2013 11:33 AM
Subject: Re: Kolb-List: Fw: 912 elect
Same as the yellow wires on other Rotaxing engines.. the two yellow
wires are the alternator output...AC , whose frequency varies with
rpm's. There should be no short to ground when measuring each yellow
wire..
The case of the regulator can be ground or there can be a black wire
coming out for ground...Red is positive 13.8 or there bouts... The AC
input voltage to the regulator can be quite high..though I have never
measured it.. This info based on two cycle engines...should be the same
for others..
Herb
At 10:51 AM 1/16/2013, you wrote:
frank contacted me direct and said that only the header came through to
me. so I shot this back to him direct.
From: b young <mailto:byoungplumbing@gmail.com>
Sent: Wednesday, January 16, 2013 9:48 AM
Subject: Re: 912 elect
I think some how my computer don=C3=A2=82=AC=84=A2t like
forwarding the graphics in your post.
this was my reply
boyd
Need help understanding the 912 uls generating sys.
looking at page 17-1 fig 29 of the rotax install manual. I need to know
if i can check for voltage between one of the yellow (ge) wires and
ground, or between the two yellow wires , and if so what should the
voltage be.I would measure from yellow to yellow.... not sure but I
think if there is a yellow to ground voltage, there may be a short. I
would think the voltage would change with the rpm... but should be
greater than 14 v probably around 18 V ac or there about. the
regulator/rectifier will convert from ac to dc at the proper charge
voltage for the battery. my eis showes 13.8 v dc.
What does the 2,5 and a little square box repesent
in the wires going to the G terminals on the rectifier?I am thinking,
the 2.5@ is the wire size,, EG:2.5 mm squared the battery to the starter
motor is 16 @ or 16 mm squared
What is # 11 in fig 29 if it is a diode , what kind and where can i find
one. it is a 3 W 12 V charge indicating lamp
my engine was removed from a wrecked plane and i don't
think the hookup used the capaciator or whatever #11 is
that is shown in fig 29. thanks to anyone that can help me. I did not
use the charge indicator lamp.. the eis shows battery voltage.. but I
did use the capacitor shown as item (10) in the diagram between B+ and
ground
Frank Goodnight boyd young mkiii utah hope this helps
Message 10
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Lots on the net... the output is two yellow
wires...shielded...and they go to the
reg/rect the inputs which are normally shown
with a sign wave inscription .. Rotax choses to
mark those with a "G". The + or output goes to
a filter cap and a slow blow fuse...30 amp...
and on to the plus side of the
battery....normally found at the starter
solenoid...Capacitor is 22k ufd or there
bouts...not critical..just there for noise
transients.. All pretty much the same as 2 cycle...Herb
At 12:30 PM 1/16/2013, you wrote:
>Herb:
>
>I am away from home and my manuals.=C2 The
>reg/rec for the 912 series engines are similar,
>but also quite different from the 2 stroke Rotax engines.
>
>john h
>mkIII
>Woodville, FL
>
>From: owner-kolb-list-server@matronics.com
>[mailto:owner-kolb-list-server@matronics.com] On Behalf Of Herb Gayheart
>Sent: Wednesday, January 16, 2013 11:33 AM
>To: kolb-list@matronics.com
>Subject: Re: Kolb-List: Fw: 912 elect
>
>Same as the yellow wires on other Rotaxing
>engines.. the two yellow wires are the
>alternator output...AC , whose frequency varies
>with rpm's. There should be no short to ground
>when measuring each yellow wire..
>
> The case of the regulator can be ground or
> there can be a black wire coming out for
> ground...Red is positive 13.8 or there bouts...
> The AC input voltage to the regulator can be
> quite high..though I have never measured
> it.. This info based on two cycle engines...should be the same for
others..
>
> Herb
>
>
>At 10:51 AM 1/16/2013, you wrote:
>
>frank contacted me direct and said that only the
>header came through to me. so I shot this back to him direct.
>
>From: <mailto:byoungplumbing@gmail.com>b young
>Sent: Wednesday, January 16, 2013 9:48 AM
>To: <mailto:frank.goodnight@att.net>frank goodnight
>Subject: Re: 912 elect
>
>I think some how my computer don=C3=A2=99t like
>forwarding the graphics in your ur post.
>this was my reply
>boyd
>Need help understanding the 912 uls generating sys.
>looking at page 17-1 fig 29 of the rotax install
>manual. I need to know if i can check for
>voltage between one of the yellow (ge) wires and
>ground, or between the two yellow wires , and if
>so what should the voltage be.I would measure
>from yellow to yellow.... not sure but I think
>if there is a yellow to ground voltage, there
>may be a short. I would think the voltage would
>change with the rpm... but should be greater
>than 14 v probably around 18 V ac or there
>about. the regulator/rectifier will convert from
>ac to dc at the proper charge voltage for the battery. my eis showes 13.8 v
dc.
>What does the 2,5 and a little square box repesent
>in the wires going to the G terminals on the
>rectifier?I am thinking, the 2.5@ is the wire
>size,, EG:2.5 mm squared the battery to the
>starter motor is 16 @ or 16 mm squared
>What is # 11 in fig 29 if it is a diode , what
>kind and where can i find one. it is a 3 W 12 V charge indicating lamp
>my engine was removed from a wrecked plane and i don't
>think the hookup used the capaciator or whatever #11 is
>that is shown in fig 29. thanks to anyone that
>can help me. I did not use the charge indicator
>lamp.. the eis shows battery voltage.. but I did
>use the capacitor shown as item (10) in the diagram between B+ and ground
>Frank Goodnight boyd young mkiii utah hope this helps
>
>
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>
>
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><http://www.matronics.com/Navigator?Kolb-List>http://www.matronics.com/Navi
gator?Kolb-List
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Message 11
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Here is a link. Lots more there... Herb
http://www.search-document.com/pdf/1/8/rotax-912-wiring.html
At 12:30 PM 1/16/2013, you wrote:
>Herb:
>
>I am away from home and my manuals.=C2 The
>reg/rec for the 912 series engines are similar,
>but also quite different from the 2 stroke Rotax engines.
>
>john h
>mkIII
>Woodville, FL
>
>From: owner-kolb-list-server@matronics.com
>[mailto:owner-kolb-list-server@matronics.com] On Behalf Of Herb Gayheart
>Sent: Wednesday, January 16, 2013 11:33 AM
>To: kolb-list@matronics.com
>Subject: Re: Kolb-List: Fw: 912 elect
>
>Same as the yellow wires on other Rotaxing
>engines.. the two yellow wires are the
>alternator output...AC , whose frequency varies
>with rpm's. There should be no short to ground
>when measuring each yellow wire..
>
> The case of the regulator can be ground or
> there can be a black wire coming out for
> ground...Red is positive 13.8 or there bouts...
> The AC input voltage to the regulator can be
> quite high..though I have never measured
> it.. This info based on two cycle engines...should be the same for
others..
>
> Herb
>
>
>At 10:51 AM 1/16/2013, you wrote:
>
>frank contacted me direct and said that only the
>header came through to me. so I shot this back to him direct.
>
>From: <mailto:byoungplumbing@gmail.com>b young
>Sent: Wednesday, January 16, 2013 9:48 AM
>To: <mailto:frank.goodnight@att.net>frank goodnight
>Subject: Re: 912 elect
>
>I think some how my computer don=C3=A2=99t like
>forwarding the graphics in your ur post.
>this was my reply
>boyd
>Need help understanding the 912 uls generating sys.
>looking at page 17-1 fig 29 of the rotax install
>manual. I need to know if i can check for
>voltage between one of the yellow (ge) wires and
>ground, or between the two yellow wires , and if
>so what should the voltage be.I would measure
>from yellow to yellow.... not sure but I think
>if there is a yellow to ground voltage, there
>may be a short. I would think the voltage would
>change with the rpm... but should be greater
>than 14 v probably around 18 V ac or there
>about. the regulator/rectifier will convert from
>ac to dc at the proper charge voltage for the battery. my eis showes 13.8 v
dc.
>What does the 2,5 and a little square box repesent
>in the wires going to the G terminals on the
>rectifier?I am thinking, the 2.5@ is the wire
>size,, EG:2.5 mm squared the battery to the
>starter motor is 16 @ or 16 mm squared
>What is # 11 in fig 29 if it is a diode , what
>kind and where can i find one. it is a 3 W 12 V charge indicating lamp
>my engine was removed from a wrecked plane and i don't
>think the hookup used the capaciator or whatever #11 is
>that is shown in fig 29. thanks to anyone that
>can help me. I did not use the charge indicator
>lamp.. the eis shows battery voltage.. but I did
>use the capacitor shown as item (10) in the diagram between B+ and ground
>Frank Goodnight boyd young mkiii utah hope this helps
>
>
>=C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 - The Kolb-List Email Forum -
>
>
>=C2 =C2 -->
><http://www.matronics.com/Navigator?Kolb-List>http://www.matronics.com/Navi
gator?Kolb-List
>
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FORUMS -
>
>
>=C2 =C2 --> <http://forums.matronics.com>http://forums.matronics.com
>
>
>=C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 - List Contribution Web
Site -
>=C2 Thank you for your generous support!
>=C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2 =C2
=C2 =C2 =C2 =C2 =C2
>=C2 =C2 =C2 =C2 =C2 -Matt Dralle, List Admin.
>=C2 =C2 -->
><http://www.matronics.com/contribution>http://www.matronics.com/contributio
n
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>
Message 12
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Copyright =A9 ConAir Sports Ltd. All rights reserved. Site
<http://www.conairsports.co.uk/index.html>
home.
<http://www.conairsports.co.uk/rotax.html>
rotax.
<http://www.conairsports.co.uk/cors-air.html>
cors-air.
<http://www.conairsports.co.uk/heated%20flying%20gear.html>
heated flying gear.
<http://www.ekmpowershop2.com/ekmps/shops/conairsports/index.asp>
shop.
<http://www.conairsports.co.uk/contact%20us.html>
contact us.
To search for parts or accessories click on the
SHOP tab (left) and search in the shop.
ConAir Rotax 4 Stroke Service
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rotax 4-stroke - ignition & charging
912UL, 912A, 912F, 912ULS, 912S, 914UL and 914F Engines
resistance values / trigger gaps of the ignition unit
The values indicated below can be checked on the
engine installed in the aircraft, after detaching connections:
Generator coil (on stator)
yellow ' yellow
0.1-0.8 ohms
Generator winding
yellow ' grounding
open circuit
Charging coil (on stator)
red ' ground
3.2-4.5 ohms
Trigger coil
green/white ' blue/yellow
115-123 ohms
Trigger coil new* (with clamps)
white/yellow ' blue/yellow
220-250 ohms
Ignition coil, primary
connection contact ' ground
0.1-0.4 ohms
Ignition coil, secondary
high voltage ' high voltage
6.1-6.7 kohms
Resistance spark plug connector
4.4-6.0 kohms
Trigger gap old style
0.4-0.5mm (16-20 thou)
Trigger gap new style with clamps
0.3-0.4mm (12-16 thou)
* fitted in serial production, starting with design year 1995
spark plugs & plug gaps
ENGINE
PLUG TYPE
PART NUMBER
PLUG GAP
CHANGE INTERVAL S (unleaded mogas)
CHANGE INTERVALS (avgas)
912UL
DCPR7E
897255
0.6-0.7 mm (0.024 ' 0.028 in)
200 hours
100 hours
912A
DCPR7E
897255C
0.6-0.7 mm (0.024 ' 0.028 in)
200 hours
100 hours
912F
DCPR7E
897255C
0.6-0.7 mm (0.024 ' 0.028 in)
200 hours
100 hours
912ULS
DCPR8E
297940
0.6-0.7 mm (0.024 ' 0.028 in)
200 hours
100 hours
912S
DCPR8E
297940C
0.6-0.7 mm (0.024 ' 0.028 in)
200 hours
100 hours
914UL
X27EPR
897257
0.6-0.7 mm (0.024 ' 0.028 in)
100 hours
100 hours
914F
X27EPR
897257C
0.6-0.7 mm (0.024 ' 0.028 in)
100 hours
100 hours
<http://www.conairsports.co.uk/4-stroke%20ignition.html#resistance_1>resista
nce
values / trigger gaps of the ignition unit
<http://www.conairsports.co.uk/4-stroke%20ignition.html#spark>spark
plugs & plug gaps
All information provided here is correct at the
time of publishing to the best of our knowledge,
but Rotax recommendations may change at any time
without our knowledge. It is the engine owners
responsibility to ensure that the engine is fit
for flight at all times. The information is
provided here free of charge and with no
obligation from us to the consumer. To ensure
that you have the correct and most up to date
information, you should refer to the current
Installation, Operators and Maintenance manuals
for your engine. The information provided here
may not be valid for aircraft outside the
UK.
<http://www.conairsports.co.uk/terms%20of%20use.html>Click
here for
<http://www.conairsports.co.uk/terms%20of%20use.html>ConAir
SportsTerms& Conditions, including website usage policy.
[]
[]
[]
[]
Always apply the correct heat sink paste to plug
threads,
<http://www.ekmpowershop2.com/ekmps/shops/conairsports/silicon-heat-transfer
-compound-1ml-lub-022-417-p.asp>see
here
wiring diagrams
The wiring diagram is in the Installation manual
for the engine which can be downloaded from the
<http://www.rotax-aircraft-engines.com/a_searchdoc.aspx>Documentation
page at www.rotax-aircraft-engines.com
[]
<http://www.conairsports.co.uk/4-stroke%20ignition.html#wiring_1>wiring
diagrams
[]
does the ignition system need a battery to run the engine?
No, the ignition system is completely self
generating and redundant (two separate ignition systems).
912 series engines - circuit A fires 1-2 top 3-4 bottom plugs
circuit B fires 1-2 bottom 3-4 top plugs
914 series engines - A fires all top, B fires all bottom plugs
<http://www.rotax-aircraft-engines.com/a_searchdoc.aspx>
<http://www.rotax-aircraft-engines.com/a_searchdoc.aspx>
[]
how does the electronic ignition work (basic description)?
Rotating magnets in the flywheel generate power
as they pass over coil windings on the
stator. The power generated is stored in
capacitors in the SMD modules until the
=93triggers=94 send a signal to the capacitor which
then passes the power to the secondary coils,
which increase the voltage and send it, via the
ignition cables, to the spark plugs.
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generator / regulator
Regulators need cooling - mounting in the engine
bay is not a good idea and can cause premature failure.
The regulator output is 250W at 5500rpm. The
output is less at cruise rpms. Do not overload
the electrical system - items such as
electrically heated clothing put high demands on the charging system.
Here is some trouble shooting info on the 912...Charging system...Herb
914 engines rely on the electrical system for the
fuel pumps. Improper installation or overloading
of the charging system should be avoided.
Problem: Battery not charging (I.e. Low voltage)
Solutions: Remove the yellow wires and check the
resistance between them is 0.3 - 0.8 ohms. If
the resistance is infinity then you have a broken
wire (open circuit). Re-install the yellow
wires, run engine at idle and check output form
yellow wires (should be 18-20 AC volts). Check
output from B+ terminal or regulator, should be
14 DC volts - check the battery is charged - the
regulator needs to be connected to a charged battery to energise it.
Problem: The generator is putting out AC volts
but the Regulator is not putting out more than
battery voltage - regulator is faulty.
Solution: Replace the regulator
Problem: The generator is not producing AC volts, the stator wiring is
faulty.
Solution: Check / replace the stator wiring. Replace the stator.
Check grounds on Regulator & engine block before
ordering new parts! Check your wiring if you
fail more than one regulator - faulty regulators
are not common but crossed wires are!
Message 13
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| Subject: | Aileron trim-drag question |
Kolb Friends -
Been flying my Mark-3 for a while now (2002), and over the years have
strived tried to clean up various airframe details to reduce drag.
(Stuff like aileron gap seals, gear leg fairings, etc.)
My Kolb requires aileron trim, for straight-and-level flight. I
currently use the proven "John Hauck" method for aileron trim - a bungee
around the control stick, pulling the stick to one side. Works great,
and is cockpit adjustable. But I've been thinking of "upgrading" this
system in favor of a proper trim tab on one of the ailerons, to fix my
trim requirement.
I've been wondering this: Would installing an aileron trim tab cause any
MORE or LESS drag than the bungee cord system?
Intuitively, I think the drag effect would be equal. But I wanted to
hear what the more-experienced minds of my fellow Kolb folk think.
Many thanks -
Dennis Kirby
Mark-3, 912ul, Powerfin-72 in
Sandia Park, NM
Message 14
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| Subject: | Aileron trim-drag question |
I've been wondering this: Would installing an aileron trim
tab cause any MORE or LESS drag than the bungee cord system?
Intuitively, I think the drag effect would be equal. But I
wanted to hear what the more-experienced minds of my fellow
Kolb folk think.
Many thanks -
Dennis Kirby
If there is any difference, doubt it would be measureable.
Why drill holes in the aileron and pop rivets when you
already have an infinitely adjustable roll trim system?
john h
mkIII
Woodville, FL
Message 15
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| Subject: | Re: Aileron trim-drag question |
Dennis, Have you tried to find the nature of the trim requirement? Wing
incidence the same right and left? Can you pick up the falling wing with
rudder input?
Rick Girard
do not archive
On Wed, Jan 16, 2013 at 3:23 PM, Kirby, Dennis Civ USAF AFMC AFNWC/ENS <
Dennis.Kirby@kirtland.af.mil> wrote:
> Kolb Friends '****
>
> ** **
>
> Been flying my Mark-3 for a while now (2002), and over the years have
> strived tried to clean up various airframe details to reduce drag. (Stuf
f
> like aileron gap seals, gear leg fairings, etc.)****
>
> ** **
>
> My Kolb requires aileron trim, for straight-and-level flight. I currentl
y
> use the proven =93John Hauck=94 method for aileron trim ' a bungee arou
nd the
> control stick, pulling the stick to one side. Works great, and is cockpi
t
> adjustable. But I=92ve been thinking of =93upgrading=94 this system in f
avor of
> a proper trim tab on one of the ailerons, to fix my trim requirement.****
>
> ** **
>
> I=92ve been wondering this: Would installing an aileron trim tab cause an
y
> MORE or LESS drag than the bungee cord system?****
>
> ** **
>
> Intuitively, I think the drag effect would be equal. But I wanted to hea
r
> what the more-experienced minds of my fellow Kolb folk think.****
>
> ** **
>
> Many thanks '****
>
> ** **
>
> Dennis Kirby****
>
> Mark-3, 912ul, Powerfin-72 in****
>
> Sandia Park, NM****
>
> *
>
===========
===========
===========
===========
> *
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
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