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  #11  
Old 06-17-2008, 01:55 PM
pierre smith's Avatar
pierre smith pierre smith is offline
 
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
Default Wow...

....the kind of hours and testing that really tell the story.

Thanks much, Ross,

Regards,
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RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15 Sold
Air Tractor 402 PT-6-20 Sold
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga

It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132


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  #12  
Old 06-17-2008, 02:29 PM
the_other_dougreeves the_other_dougreeves is offline
 
Join Date: Jan 2006
Location: Dallas, TX (ADS)
Posts: 2,180
Default

Glider towing is awful duty for an engine - operation at WOT in climb, then diving to the deck at high airspeeds and no power. Repeat as necessary. The engines don't tend to last long.

This is an application where it makes total sense for a water cooled engine. Also, additional weight isn't that much of an issue for the Pawnee.

TODR
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  #13  
Old 06-17-2008, 02:36 PM
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frankh frankh is offline
 
Join Date: Jul 2006
Location: Corvallis Oregon
Posts: 3,547
Default I agree

A most impressive result. Indeed this is an engine with a PSRU in a real airplane thats doing very heavy duty work.

Indeed the water cooling is great at preventing shock cooling that glider tugs and jump planes are plagued with.

Now of course an RV is a different animal..fast and low drag is diffrent to the "stimp Pulling" type work the tug is doing..Probably more like what my tractor does than my RV..

One thing caught my eye and I agree with...Auto engines can be great as long as they are not messed with..I suffered years of poor reliability from a well known Soob 1.8 conversion...the valve guides kept falling out..In fact the thing tried to kill me three times...It was always the after market valve guides that engine "rebuilder" didn't know how to install correctly.

So I was left to find my own solution which I eventually did and the package was then very reliable. Like everything under the hood though, The chain is only as strong as the weakest link and made me think very hard before chosing another auto conversion.

But the upside is it looks like there is some superb development work being done with autos and maybe one day we'll have a drop in replacement that will be engineered to the point where is outshines the lyc and is half the cost!

Good job..

Frank
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  #14  
Old 06-17-2008, 03:40 PM
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rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 5,745
Default

I agree that many guys create problems for themselves installing non-stock parts like cams and springs especially. This comes up time and time again.

Generally the closer to stock it is, the more reliable. I just change pistons on my Sube for turbocharging- the rest is bone stock.
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Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, Shorai- RV6A C-GVZX flying from CYBW since 2003- 441.0 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi2.htm


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