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Vamoose' Ex-Reduction Drive

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biglar

Joined: 14 Jan 2006
Posts: 457

Posted: Sun Oct 01, 2006 8:14 pm Post subject: Vamoose' Ex-Reduction Drive

I mentioned a problem with Vamoose' redrive a bit ago, and  have been asked for more info, so I guess I should share it with all.  I'm  not really crazy about this, but.........

  

 I started the engine without the prop on a few weeks ago, and  it ran great.  NO OIL LEAKS ! ! !  I thought I was home free, and was  daydreaming about actually flying the thing, and wanted to get it in the air by  Nov. 15 - the 10th anniversary of receiving the kit from TOK.  I was really  going for it - working on it every day after work.

  

 So, I bolted the prop back on, safety wired it, and lit 'er  up.  The engine started to fire, then backfired or kicked back - or both -  and there was a loud bang and a jolt and the engine stopped.  Hitting the  starter didn't even wiggle the prop, so I shut everything off and tried hand  propping it.  Wouldn't move, so I tore that s.o.b. redrive off - again -  and tore it apart - again.  Here's a picture of what I found.  That  chain literally exploded.  I think that's more than a great plenty.   I've stubbornly worked thru several issues with that thing, and that's  enuf.  I don't want to fly in front of it, so it goes in the trash.   

  

 From here ??  I dunno yet.  I'm researching a couple  of other redrives, but it's too early to say yet.  I'll keep ya  posted.                                      Lar.

  

 Larry Bourne

Palm Springs, CA

Building Kolb Mk  III

Vamoose

www.gogittum.com

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Larry Bourne
Palm Springs, CA
Building Kolb Mk IIIC
"Vamoose"

Jim Baker

Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA

Posted: Sun Oct 01, 2006 9:31 pm Post subject: Vamoose' Ex-Reduction Drive

 	  Quote: 	
		   Here's a picture of what I found. That chain 

 literally exploded.


	


Holy crap! Just for info...is either drive hub/gear cushioned on 

the shaft or just bolted up solid?

Jim Baker

580.788.2779

Elmore City, OK

biglar

Joined: 14 Jan 2006
Posts: 457

Posted: Mon Oct 02, 2006 5:04 am Post subject: Vamoose' Ex-Reduction Drive

It's solid, no cushioning.  The theory the mfr explained to me was that the 

belly in the chain caused by centrifugal force would act as a cushion. 

Maybe, but it was still at cranking speed - not much speed for centrifugal 

force to be a factor.                    Lar.



Larry Bourne

Palm Springs, CA

Building Kolb Mk III

Vamoose

www.gogittum.com

---

_________________
Larry Bourne
Palm Springs, CA
Building Kolb Mk IIIC
"Vamoose"

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Mon Oct 02, 2006 5:24 am Post subject: Vamoose' Ex-Reduction Drive

| It's solid, no cushioning.  The theory the mfr explained to me was 

that the

| belly in the chain caused by centrifugal force would act as a 

cushion.

                     Lar.



Larry:



How many of these redrives in operation?



Any idea how much time owners have accumulated on them?



Are they designed specifically for VW engines?



The 912ULS had a problem with gear box chatter at start up and idle, 

even though it had a "ramp and dog" system same as the 912UL.  The 

difference being compression ratio.  912UL, I think, is 9 or 9.5 to 1. 

The 912ULS is 10.5 to one.  After 850 hours I installed the high 

torque starter and slipper clutch.  The 912ULS became a docile engine, 

even more so than the 912UL.



I think what I am trying to say is, engines can behave quite violently 

from torsional vibration, even when they are equipped to handle the 

job.  A high compression engine, in particular, will not tolerate 

torsional vibration when there is no system to absorb it, e.g., a 

solid chain drive.  Not much absorbtion in chain drives.



Sorry to hear of your continued problem.  Really takes the fun out of 

building and hopefully flying your Kolb.



Take care,



john h

mkIII

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

Jim Baker

Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA

Posted: Mon Oct 02, 2006 5:57 am Post subject: Vamoose' Ex-Reduction Drive

 	  Quote: 	
		   It's solid, no cushioning.  The theory the mfr explained to me was that the 

 belly in the chain caused by centrifugal force would act as a cushion. 

 Maybe, but it was still at cranking speed - not much speed for centrifugal 

 force to be a factor.                    Lar.


	


Well, that's a perpetuated lie (not from you, the Hy-Vo chain 

community)....



http://www.epi-eng.com/GBX-ChainDrv.htm



Good info here. I feel for you in this effort, doing something no 

one else has done isn't always easy. Obviously the chain was 

overloaded which intimates a design flaw in material selection 

(chain width, tooth pitch, static tension, alignment of sprokets, 

etc). Was the chain tight enough to prevent tooth skipping? Just 

random thoughts.....



Obviously overloaded but, man, look at the off-road transfer 

cases that use these things...some of those take a beating far 

worse and live. I'd probably look at turning the chain drive into a 

spur gear system....I didn't save your picture so wondering if 

there was enough room to fit a bearing carrier between the 

gears.  And searched the archives but didn't see it....who made 

this PSRU?

Jim Baker

580.788.2779

Elmore City, OK

jindoguy(at)gmail.com
Guest

Posted: Mon Oct 02, 2006 5:59 am Post subject: Vamoose' Ex-Reduction Drive

Larry, This is truly what the word bummer was invented to describe. Have you thought of adapting a Rotax gearbox to your engine? Might take a bit of machine work, but you'd have a proven drive with only the adaptation to de-bug. Just a thought. 



Rick



On 10/1/06, Larry Bourne <biglar(at)gogittum.com (biglar(at)gogittum.com)> wrote: 	  Quote: 	
		          I mentioned a problem with Vamoose' redrive a bit ago, and  have been asked for more info, so I guess I should share it with all.  I'm  not really crazy about this, but.........

  

 I started the engine without the prop on a few weeks ago, and  it ran great.  NO OIL LEAKS ! ! !  I thought I was home free, and was  daydreaming about actually flying the thing, and wanted to get it in the air by  Nov. 15 - the 10th anniversary of receiving the kit from TOK.  I was really  going for it - working on it every day after work.

  

 So, I bolted the prop back on, safety wired it, and lit 'er  up.  The engine started to fire, then backfired or kicked back - or both -  and there was a loud bang and a jolt and the engine stopped.  Hitting the  starter didn't even wiggle the prop, so I shut everything off and tried hand  propping it.  Wouldn't move, so I tore that s.o.b. redrive off - again -  and tore it apart - again.  Here's a picture of what I found.  That  chain literally exploded.  I think that's more than a great plenty.   I've stubbornly worked thru several issues with that thing, and that's  enuf.  I don't want to fly in front of it, so it goes in the trash.   

  

 From here ??  I dunno yet.  I'm researching a couple  of other redrives, but it's too early to say yet.  I'll keep ya  posted.                                      Lar.

  

 Larry Bourne

Palm Springs, CA

Building Kolb Mk  III

Vamoose

www.gogittum.com



  	


-- 

Rick Girard

"Ya'll drop on in"

takes on a whole new meaning

when you live at the airport.  [quote][b]

Rex Rodebush

Joined: 10 Jan 2006
Posts: 209
Location: Branson West area, Missouri

Posted: Mon Oct 02, 2006 7:56 am Post subject: Re: Vamoose' Ex-Reduction Drive

Probably hit a torsional.  Undamped torsional vibration can increase extreamly fast to tremendous levels.  I've seen a 6" 4340 shaft snapped off on a compressor application and it happened in just a few seconds.

ceengland(at)bellsouth.ne
Guest

Posted: Mon Oct 02, 2006 8:30 am Post subject: Vamoose' Ex-Reduction Drive

Larry Bourne wrote:



 	  Quote: 	
		   



 It's solid, no cushioning.  The theory the mfr explained to me was 

 that the belly in the chain caused by centrifugal force would act as a 

 cushion. Maybe, but it was still at cranking speed - not much speed 

 for centrifugal force to be a factor.                    Lar.



 Larry Bourne

 Palm Springs, CA

 Building Kolb Mk III

 Vamoose

 www.gogittum.com 


	




Find different drive maker that understands engineering & physics 

instead of old wives' (hangar) tales. A 4 cyl engine has large torque 

reversals between each power pulse. That's what breaks cranks on direct 

drive auto conversions.

For a chain drive with no torsion damping, think about the difference 

between a weight hanging on a chain & the same weight if you repeatedly 

jerk on the chain, timing the jerks so each jerk happens just as the 

weight bottoms out. If you get the weight flying high enough, think 

about the force on the chain as the weight 'hits bottom' the next time 

you jerk the chain. You can break a very large chain with a very small 

weight doing this.



Charlie

eagle1(at)commspeed.net
Guest

Posted: Mon Oct 02, 2006 10:36 am Post subject: Vamoose' Ex-Reduction Drive

I can feel your frustration Larry. But like some of  the other members have said, I don't think you can have a direct power transfer  without some sort of slippage or shock absorbing unit. I'm certainly not an  expert of these re drives but many use cog belts. Have you given these a  thought?

        As Bald  Eagle

 [quote]   ---

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Mon Oct 02, 2006 10:51 am Post subject: Vamoose' Ex-Reduction Drive

certainly not an expert of these re drives but many use cog belts. 

Have you given these a thought?

       AZ Bald Eagle



George T:



With cog belts one has the same problem.  Instead of breaking chains 

and tearing up gears, the cogs are ripped off the belt.  Most belts 

now use Kevlar or something similar.  This stuff does not stretch or 

slip.



Dan H of my area did a lot of study and experimentation on the 3 cyl 

Suzuki on his 3/4 scale Jenny.  Even enlisted the help of a Scientist 

to help with sensors and computers to try and come up with a cause and 

a solution.  All this was way over my head, but one thing did get my 

attention.  One night Dan put a strobe light on the spinning IVO prop 

on the little Suzuki.  The prop blades looked like snake dancers. 

Would never have imagined they would wiggle the way they did with the 

engine run up.



Some things work and some don't.  Maybe you all can find an answer.



john h

mkIII

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

slyck(at)frontiernet.net
Guest

Posted: Mon Oct 02, 2006 11:23 am Post subject: Vamoose' Ex-Reduction Drive

John is correct about the suzuki and its strange harmonics.

Raven, the principal supplier of drives for this engine hasn't had much 

problem

with the belt as long as it is tensioned properly, too loose wipes the 

cogs off

and too tight overheats and destroys bearings.  -Not easy to arrive at

the right tension immediately because the alloy block and head expand

a lot with warmup.  When cold the belt looks disturbingly slack.

I have had some recurring difficulty with my main shaft bearings losing

preload torque on the stack, causing the spacer between the bearings

to spin.  It performed perfectly all this summer until a week ago with

Thom Riddle and Will U. chasing me with a video cam inspired me to

work it a bit too hard.

-Still investigating and learning.

experimental BB

On 2, Oct 2006, at 2:51 PM, John Hauck wrote:



 	  Quote: 	
		   



  certainly not an expert of these re drives but many use cog belts.

 Have you given these a thought?

        AZ Bald Eagle



 George T:



 With cog belts one has the same problem.  Instead of breaking chains

 and tearing up gears, the cogs are ripped off the belt.  Most belts

 now use Kevlar or something similar.  This stuff does not stretch or

 slip.



 Dan H of my area did a lot of study and experimentation on the 3 cyl

 Suzuki on his 3/4 scale Jenny.  Even enlisted the help of a Scientist

 to help with sensors and computers to try and come up with a cause and

 a solution.  All this was way over my head, but one thing did get my

 attention.  One night Dan put a strobe light on the spinning IVO prop

 on the little Suzuki.  The prop blades looked like snake dancers.

 Would never have imagined they would wiggle the way they did with the

 engine run up.



 Some things work and some don't.  Maybe you all can find an answer.



 john h

 mkIII

NeilsenRM(at)comcast.net
Guest

Posted: Mon Oct 02, 2006 12:13 pm Post subject: Vamoose' Ex-Reduction Drive

I have the Valley Redrive on my VW powered MKIIIc. At one point I came very 

close to buying the same redrive Lar bought but didn't feel comfortable with 

the chain. The Valley redrive uses a coged belt. It works well with wood 

props and to a some what lesser degree my three bladed PowerFin. My 

understanding is the wood props have very low mass and are very rigid. The 

VW engine is a very smooth engine with low compression so it is fairly 

forgiving. It does shake on start up and shut down but isn't violent so it 

has never presented a problem. I can even idle the engine down to 800 RPM. I 

have never had a problem with the belt adjustment after the first hour of 

run in. They are adjusted per instructions and stay at that setting. Now 

with this said it does vibrate more than it did with direct drive. I have 

had cracked exhaust system brackets, Air cleaners, a drive bracket and a few 

nuts and bolts work loose. So far I have had one forced landing over the 

last 230 hours because I normally find the problem on preflight and so far 

have been able to fix the problem. The guys at Valley swear by smoothness of 

their drive with wood props and promise that they will have a long term fix 

for composite props. They have tried rubber dampers, a modified drive like 

they have on their V twin, and a sprag clutch without a satisfactory fix. 

They promise to keep trying and have been very helpful with any problems I 

have had. They even offered to help with the cost of the my engine when my 

drive bracket broke (the over reved engine was my fault).



Rick Neilsen

Redrive VW powered MKIIIc

---

Jim Baker

Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA

Posted: Mon Oct 02, 2006 12:43 pm Post subject: Vamoose' Ex-Reduction Drive

 	  Quote: 	
		   The guys at Valley swear by smoothness of 

 their drive with wood props and promise that they will have a long term fix 

 for composite props. They have tried rubber dampers, a modified drive like 

 they have on their V twin, and a sprag clutch without a satisfactory fix. 


	


They're unlikely, except perhaps through luck, to develop a 

solution without a thourough survey of vibrational characteristics 

of the system as a whole. Not cheap, not easy without extensive 

instrumented/strain guaged props and not a few accellerometers. 

Dampeners move the problem to a different regime and sprag 

clutches are useless above some speed because the system 

then acts like a direct coupled unit.



Jim Baker

580.788.2779

Elmore City, OK

Eugene Zimmerman

Joined: 10 Jan 2006
Posts: 392

Posted: Mon Oct 02, 2006 3:13 pm Post subject: Vamoose' Ex-Reduction Drive

Jim,

In my judgement the best system to deal with the torsional vibration  

harmonics problem is to use a fluid coupler such as an automatic  

transmission torque converter. The only problem is a HUGH weight  

penalty.

On Oct 2, 2006, at 4:42 PM, Jim Baker wrote:



 	  Quote: 	
		   



> The guys at Valley swear by smoothness of

> their drive with wood props and promise that they will have a long  

> term fix

> for composite props. They have tried rubber dampers, a modified  

> drive like

> they have on their V twin, and a sprag clutch without a  

> satisfactory fix.



 They're unlikely, except perhaps through luck, to develop a

 solution without a thourough survey of vibrational characteristics

 of the system as a whole. Not cheap, not easy without extensive

 instrumented/strain guaged props and not a few accellerometers.

 Dampeners move the problem to a different regime and sprag

 clutches are useless above some speed because the system

 then acts like a direct coupled unit.



 Jim Baker

 580.788.2779

 Elmore City, OK

biglar

Joined: 14 Jan 2006
Posts: 457

Posted: Mon Oct 02, 2006 5:23 pm Post subject: Vamoose' Ex-Reduction Drive

Thanks all for your thoughts and comments.  The drive was  made by Aero Kinetics and was one of only a few built to that configuration - I  found out much later.  Later ones were made with a cushioning assembly in  the hub, but after my 1st breakage the mfr informed me that the upgrade  wouldn't fit in my housing, but that the heavier input shaft should hold the  strain.  I guess it did.  I have no idea if the company is still in  business, and not interested in finding out.  One day I'll probably make a  web page detailing what all I found in that thing this summer.  Pretty  bad.  Several smaller parts broke, and some machine work was  incorrect.

  

 There's quite a bit on it, and on the engine, in the "Engine  and ReDrive" section of my website.  Click on the link in my signature  below.

  

 The thought about the off road transfer cases has bugged me,  too, because of the strain a small block could put on them in low gear.   Those guys beat 'em up, too.  I'm inclined to think it was a freak  breakage, but not so inclined as to want to take another chance with it.   Three times is enuf.  The idea about snapping or cracking the whip to break  it probably has a lot going for it.  I dunno, but that thing sure did blow  up.

  

 I've had several good conversations with a successful cog  belt drive builder, and it sounds good, but it would be very high (huge  prop to tail boom space) and quite heavy.  He's real interested and  still noodling on it.  SPG - my 1st choice - doesn't have VW adapters  available, and isn't interested.  Marcotte would be far and away the best,  but far too heavy (45 lb) and a real iffy company.  A couple others  are interesting, so we'll see.        For  now, Vamoose goes back onto the back  burner........again.                           Lar.   

  

 Larry Bourne

Palm Springs, CA

Building Kolb Mk III

Vamoose

  

 I mentioned a problem with Vamoose' redrive a bit ago, and  have been asked for more info, so I guess I should share it with all.  I'm  not really crazy about this, but.........

 [url=http://www.gogittum.com][/url]

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_________________
Larry Bourne
Palm Springs, CA
Building Kolb Mk IIIC
"Vamoose"

David Lucas

Joined: 10 Jan 2006
Posts: 79
Location: Europe. based Amsterdam NL

Posted: Tue Oct 03, 2006 4:41 am Post subject: Re: Vamoose' Ex-Reduction Drive

 	  Quote: 	
		  One night Dan put a strobe light on the spinning IVO prop 

on the little Suzuki. The prop blades looked like snake dancers. 

Would never have imagined they would wiggle the way they did with the 

engine run up. 

	




Can remember a forum at Oshkosh a few years back discussing the 'pro's and con's' of in-line water cooled engines V's boxer format (horizontaly opposed) air cooled engines and apparently the boxer format cylinders under strobe lighting dance around quite a bit as well, whereas the in-line format was more rigid.



So maybe it's not just the prop 'wiggling' but the prop and engine both moving to some degree.



David.



Do not archive.

Richard Swiderski

Joined: 30 May 2006
Posts: 5
Location: Ocala FL

Posted: Tue Oct 03, 2006 6:42 pm Post subject: Re: Vamoose' Ex-Reduction Drive

Hello Big Lar.



For a while I thought you might beat me into the air, but now I have hope again!!  



A few thoughts: 1) I have the SPG & it is a bullet proof unit with a BMW rubber donut, rated for 150hp.  It would be a great match for you if only a VW adapter was offered.  the north america dealer told me a guy in CA made a VW adapter & it was just a flat plate.  He could probably get you the guys name.  The rotax e-box might be the best way as it incorporates a starter & that might save you a lot of weight, but they won't sell you one unless you provice a serial # of your rotax engine.

2) About wiggles:  All inline 3 cyl (2 or 4 stroke) rotate around the axis of the crank.  Nothing will stop it but a counter rotating shaft.  All 4 cyl inlines jump up & down & only a counter rotating shaft stops that.  the flat opposed 4 is inherantly cancelled & is the smoothest configuraton.  The wiggles from the inline 3 & 4's are obviously sufficiently delt with in thousands of instances or they wouldn't be seen in aviation.  Everything is a compromise!



3) Please don't give up!!!!  You are a hero to many of us.



Progress Report:  After coming up with a 42% cg I had to drop back & start afreh.  I moved the engine 12" forward which caused me to weld up a new oilpan & oil pickup.  That's done.  Now the engine sat too high so I cut out the engine mount & backbone which left a bigggg hole to drop the engine (3cyl, Suzuki, 100hp, turbo, intercooled, distributorless ignition, port injected, 107 lbs torque at 3600 rpm) into my SlingShot.  I bought a tig welder & wish I had done so years ago.  It is so easy & does such a beautiful job & no sparks to fly!  After just messing with the oil pan, I am confident to start on the kolbs structure.  that's not done yet.  I keep changing the design & am going in circles.  Its hard to keep it simple, light & strong--- Kolb is a genius at that!  I will prevail.



Looking forward to another visit when you pass this way.  -richard swiderski

biglar

Joined: 14 Jan 2006
Posts: 457

Posted: Wed Oct 04, 2006 4:11 pm Post subject: Vamoose' Ex-Reduction Drive

Thanks, Richard.  If you could put me in contact with him, it'd be a great 

favor.  The drive looked good to me, too, but when I emailed about it, he 

just emailed back, "sorry, no."  Not a whole gang of interest there.



It sounds like you've been jumping thru hoops and going to the wars with 

yours, too.  Hang in there........sounds like you've got it in hand.



I had planned to come to Florida again this year, but wanted so badly to try 

the Bella Coola, B.C. area again - hoping for better weather - that I just 

hadta give it a go.  Am I ever glad.  I got my good weather and it turned 

into one of the most spectacular vacations of my career.  I also had an 

adventure with a "green eyed monster" in a cave that's kinda funny in 

retrospect.  Literally, and scared the bejeezus out of me at the time.  See 

the Riske Creek page.  I haven't built webpages yet, but have published 

short stories on the Nikon Talk Forum that you and others may enjoy.  Here's 

the links to them - dial ups shouldn't have a problem...............    Be 

sure to click on the pictures to open them full size.



Riske Creek - 

http://forums.dpreview.com/forums/read.asp?forum=1007&message=19477815



Chilko Lake - 

http://forums.dpreview.com/forums/read.asp?forum=1007&message=19378437



Bella Coola - 

http://forums.dpreview.com/forums/read.asp?forum=1007&message=19413502



FlightSeeing - 

http://forums.dpreview.com/forums/read.asp?forum=1007&message=19441435



Telegraph Cove - 

http://forums.dpreview.com/forums/read.asp?forum=1007&message=19515418



Humpbacks - 

http://forums.dpreview.com/forums/read.asp?forum=1007&message=19530814



The "FlightSeeing" tour is what inspired me to get back after Vamoose 

seriously, and I really wanted to trailer the fool thing back up there next 

year to fly myself around.  What a spectacular country.  I'm not sure yet if 

I'll return there next year with or without a plane, but the call is strong. 

Then again, the call to do more fishing, visiting and sightseeing in Florida 

and Lousy-ana is pretty strong, too.  We'll see. 

Lar.                    Do not Archive.



Larry Bourne

Palm Springs, CA

Building Kolb Mk III

Vamoose

www.gogittum.com



---

_________________
Larry Bourne
Palm Springs, CA
Building Kolb Mk IIIC
"Vamoose"

Denny Rowe

Joined: 10 Jan 2006
Posts: 89
Location: Leechburg, PA

Posted: Thu Oct 05, 2006 5:57 am Post subject: Vamoose' Ex-Reduction Drive

Larry,

I would advise you to stick with a redrive and company who has several units 

mounted on the same type of engines as yours, not one who may or may not 

want to develop one for a VW.

Also if I recall correctly, you have a pretty high compression version of 

the VW which will increase the torsional problems quite a bit.

I would think V belts are called for here to allow slip and flex.



Denny Rowe

---

ulflyer(at)verizon.net
Guest

Posted: Fri Oct 06, 2006 3:48 pm Post subject: Vamoose' Ex-Reduction Drive

What about a Hirth redrive - they use them on Subaru's and a few others if I recall right.  Rotax is getting real finicky who and what there boxes are being used on.  You would probably would have to get a used reduction drive or a new one being sold by a private party.  



 One other thing, sounds like the prop made a rather abrupt stop, is there any potential of crank damage (twist what ever) as a result?

 jerb 



 

 At 08:58 AM 10/2/2006, you wrote:

 [quote]Larry, This is truly what the word bummer was invented to describe. Have you thought of adapting a Rotax gearbox to your engine? Might take a bit of machine work, but you'd have a proven drive with only the adaptation to de-bug. Just a thought. 



 Rick



 On 10/1/06, Larry Bourne <biglar(at)gogittum.com (biglar(at)gogittum.com)> wrote:

   I mentioned a problem with Vamoose' redrive a bit ago, and have been asked for more info, so I guess I should share it with all.  I'm not really crazy about this, but.........

   

  I started the engine without the prop on a few weeks ago, and it ran great.  NO OIL LEAKS ! ! !  I thought I was home free, and was daydreaming about actually flying the thing, and wanted to get it in the air by Nov. 15 - the 10th anniversary of receiving the kit from TOK.  I was really going for it - working on it every day after work.

   

  So, I bolted the prop back on, safety wired it, and lit 'er up.  The engine started to fire, then backfired or kicked back - or both - and there was a loud bang and a jolt and the engine stopped.  Hitting the starter didn't even wiggle the prop, so I shut everything off and tried hand propping it.  Wouldn't move, so I tore that s.o.b. redrive off - again - and tore it apart - again.  Here's a picture of what I found.  That chain literally exploded.  I think that's more than a great plenty.  I've stubbornly worked thru several issues with that thing, and that's enuf.  I don't want to fly in front of it, so it goes in the trash.  

   

  From here ??  I dunno yet.  I'm researching a couple of other redrives, but it's too early to say yet.  I'll keep ya posted.                                     Lar.

   

  Larry Bourne

  Palm Springs, CA

  Building Kolb Mk III

  Vamoose

  www.gogittum.com

 

  



 

 -- 

 Rick Girard

 "Ya'll drop on in"

 takes on a whole new meaning

 when you live at the airport. 

  	  Quote: 	
		  



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