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  #11  
Old 01-02-2017, 09:27 AM
rv7charlie rv7charlie is offline
 
Join Date: May 2006
Location: Pocahontas MS
Posts: 2,952
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Yeah, looking forward to seeing fuel flow numbers in various modes.
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  #12  
Old 01-02-2017, 12:17 PM
David-aviator David-aviator is offline
 
Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,487
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Congrats on the build and first flight Geoff.
Its a hat's off tribute, especially with a new engine type.
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  #13  
Old 01-04-2017, 08:40 AM
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jetmech jetmech is offline
 
Join Date: May 2007
Location: Fairfield, CA
Posts: 96
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A big congrats Geoff on getting her flying..greating looking with the underwing rad's
make it look like a Spit!
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RV-7
Chelton Flt sys
TMX REDGOLD IO-360/Dual EFII
RV-3a/o-320 Old School style Brada
Speed is life! Bank it & Yank it for the G's
Dues paid 2018 thxs again DR!
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  #14  
Old 01-04-2017, 01:58 PM
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smokyray smokyray is offline
 
Join Date: Jan 2005
Location: TX32
Posts: 1,708
Default Alternative flight style....

Quote:
Originally Posted by rv6ejguy View Post


Geoff Braddock flew his EJ257 powered RV8 on Dec. 27th and reports all went smoothly.

Empty weight was 1187lbs. He's using an Autoflight H6 300 gearbox with 1.95 ratio and an IVO 68 inch in-flight adjustable prop.

A few initial numbers: 2500fpm climb at 90 knots with full fuel running 5500 rpm and about 44 inches. Cruise at 4500 MSL, 4500rpm and unspecified MAP was 170 KTAS.

Seems it may be under propped a bit so he probably will be going up in diameter in the future.

Cooling was reported excellent with OATs of around 30 to 35C- never exceeded 80C.

Geoff did a nice job fitting the Subaru Sti engine and under wing rads complete with proper scoops and exit doors. Looks a bit Spitfire like. The intercooler is fed from the enlarged duct under the spinner.

Will be interesting to see more flight test numbers as he gets more hours on the aircraft.

This is pretty much the recipe I'd use today if I was doing another RV using an alternative engine.

Congrats Geoff, on completion of a challenging build!

G'Day Geoff, fair dinkum!
From a fellow alternative engine guy...nicely done!
V/R
Smokey

PS: Spitfire paint scheme hopefully forthcoming...
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  #15  
Old 01-04-2017, 06:41 PM
Randy Randy is offline
 
Join Date: Jan 2005
Location: Sedona Arizona
Posts: 349
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Hat off to you for hanging it out there and doing a great job of it.

After 4 Sube installs I gave it up for a Lyc clone but seeing your effort makes me wish for some more of that turbo power...

Good luck with your testing and I hope you can report results here.

Congratulations!

Randall
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  #16  
Old 01-05-2017, 11:39 PM
dlomheim dlomheim is offline
 
Join Date: Sep 2006
Location: (2OK2) OK City, OK
Posts: 358
Default RV-8 w/Subie

Quote:
Originally Posted by rv6ejguy View Post
Here's the Photobucket link: http://s1277.photobucket.com/user/RV...?sort=3&page=1

Yes, these things move. With MT props on the two RV7 STi turbos, 190 to 200 KTAS around 12000 feet at 40ish inches MAP. With pants and leg fairings on, looks like Geoff will be in the same zone.
Thanks for the link and initial numbers Ross! As Charlie said, we'll look forward to hearing more in the future and maybe he'll post some fuel flow numbers as well. In the pictures it shows he built a plug to create his "spitfire" style scoop; so when things slow down for him in the future, maybe he'll consider offering some scoops for sale?

Doug
RV-9A Mazda 13B/ FWF
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  #17  
Old 01-06-2017, 07:38 AM
rv6ejguy's Avatar
rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 4,618
Default Bad Weather

I got an email from Geoff today. He's not been able to fly at all this week due to terrible weather. He promises some more info when he can fly again.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 422 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #18  
Old 01-06-2017, 07:48 AM
David-aviator David-aviator is offline
 
Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,487
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Quote:
Originally Posted by Randy View Post
Hat off to you for hanging it out there and doing a great job of it.

After 4 Sube installs I gave it up for a Lyc clone but seeing your effort makes me wish for some more of that turbo power...

Good luck with your testing and I hope you can report results here.

Congratulations!

Randall
You hung in there longer than me, Randall. I did only 2.

I do miss the smooth H6 with MT prop.

Lycoming (Superior) with Catto is so reliable it scares me. I keep wondering when the thing will do something unusual, so far it has not.

The H6 could be as bullet proof if it had an internal PSRU and remote radiators like WWII fighters. That technology is reliable and ancient, why no one has done it is matter of money and engineering, but it would be the cat's meow. If PSRU would allow 6000 rpm it would really snort.
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RV-7A...Sold #70374
The RV-8...Sold #83261
I'm in, dues paid 2018 This place is worth it!
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  #19  
Old 01-06-2017, 08:00 AM
rv7charlie rv7charlie is offline
 
Join Date: May 2006
Location: Pocahontas MS
Posts: 2,952
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The RWS drive from Tracy Crook (no longer available; he retired) is comfortable in the 7K rpm range. There's a guy down under working on an updated version with a couple of minor tweaks, but he hasn't given any projected production date.

Tracy has offered the drawings to anyone interested in resuming production.

Charlie
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  #20  
Old 01-06-2017, 08:01 AM
rv6ejguy's Avatar
rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 4,618
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The beauty of the turbo is you don't need to rev the engine high like the atmo engine to make the power. No real need to rev over 5000 for takeoff and 4000 to 4500 in cruise. The engine is loafing down here and you rarely need to run over 40 inches in cruise (60 inches is stock MAP). The feeling is just of effortless power without all the noise of the atmo six.

Even running down here, the STi puts out at least 40 more hp than the Eggenfellner EZ30 engines which were heavy and strangled by poor intake and exhaust systems.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 422 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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