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  #1  
Old 12-29-2016, 03:48 PM
rv6ejguy's Avatar
rv6ejguy rv6ejguy is offline
 
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Location: Calgary, Canada
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Default Turbo Subaru RV-8 Flies in Australia



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!
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 424.4 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #2  
Old 12-30-2016, 01:21 AM
Ralph Inkster Ralph Inkster is offline
 
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Location: Calgary, Alberta
Posts: 395
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Congratulations Geoff!
Wish you great success with your installation!

Ralph Inkster
Builder- RV7 Turbo STI C-FKRZ
- & others with varied Lycoming combinations
Calgary Alberta Canada
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Maintain lots, upgraded & repaired some, modified more, rebuild a few, & built 4 of 'em

Last edited by Ralph Inkster : 12-30-2016 at 01:29 AM.
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  #3  
Old 12-30-2016, 06:29 AM
dlomheim dlomheim is offline
 
Join Date: Sep 2006
Location: (2OK2) OK City, OK
Posts: 360
Default Underwing Rads

Ross: Are there any pictures available that you could post showing how he plumbed his under-wing radiators? It seems that would be a great way to go; but I'm curious how he's moving the fluids all the way from the engine, through the cockpit and out to the wings...

It also will be interesting to hear how well he likes the IVO, since some of our Mazda rotary guys have reported they can't achieve VAN's top speed numbers with the IVO.

Doug Lomheim
RV-9A Mazda 13B/ FWF
RV-3A sold
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  #4  
Old 12-30-2016, 07:18 AM
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rv6ejguy rv6ejguy is offline
 
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Location: Calgary, Canada
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Quote:
Originally Posted by dlomheim View Post
Ross: Are there any pictures available that you could post showing how he plumbed his under-wing radiators? It seems that would be a great way to go; but I'm curious how he's moving the fluids all the way from the engine, through the cockpit and out to the wings...

It also will be interesting to hear how well he likes the IVO, since some of our Mazda rotary guys have reported they can't achieve VAN's top speed numbers with the IVO.

Doug Lomheim
RV-9A Mazda 13B/ FWF
RV-3A sold
I can see if I can find his Photobucket link at work today- that showed some rad details. He's just running heater hose to each rad

I have the IVO too. You must use the coarse pitched version on an RV (not the standard pitch version) and you don't want to shorten it too much. I run the full 76 inches and find it cannot absorb full power above 10-12,000 feet with my 2.2 redrive ratio at full coarse pitch, still trued 181 knots at 15,000 feet though the RPM was not staying down where I would have liked.

Geoff remarked that he was taking off at neutral pitch which is what I do too. From his description, his prop seems to work similarly to my setup. I suspect he's making a lot more power than me with the STi vs. my EJ22 and is running a lot more MAP. Probably making a lot more power at altitude than most atmo 13Bs as well.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 424.4 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #5  
Old 12-30-2016, 07:36 AM
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DanH DanH is offline
 
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Quote:
Empty weight was 1187lbs.

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.

Cooling was reported excellent with OATs of around 30 to 35C- never exceeded 80C.
Going to be a little heavy with wheelpants and paint. The rest of the numbers are excellent, in particular for a first pass. 4500/1.97 is 2300 prop RPM, so 170 KTAS without pants is very reasonable.

It will be interesting to see what it will do at 9500~11500, where we NA guys run out of manifold pressure.

Quote:
This is pretty much the recipe I'd use today if I was doing another RV using an alternative engine.
Me too.
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  #6  
Old 12-30-2016, 08:21 AM
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rv6ejguy rv6ejguy is offline
 
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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.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 424.4 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm



Last edited by rv6ejguy : 12-30-2016 at 08:34 AM.
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  #7  
Old 12-30-2016, 08:36 AM
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airguy airguy is offline
 
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Wow - I really like those rad scoops in the wing. I just can't shake the idea of doing something like this on my next build.

Oh well, the wife tells me my "next build" is going to be her new house - so I guess I have a little time to think about it before committing.
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Garden City, TX
N16GN flying! http://websites.expercraft.com/airguy/
Built an off-plan 9A with too much fuel and too much HP. Should drop dead any minute now.
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  #8  
Old 12-30-2016, 08:44 AM
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rv6ejguy rv6ejguy is offline
 
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Location: Calgary, Canada
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Quote:
Originally Posted by airguy View Post
Wow - I really like those rad scoops in the wing. I just can't shake the idea of doing something like this on my next build.

Oh well, the wife tells me my "next build" is going to be her new house - so I guess I have a little time to think about it before committing.
Yeah -8s look cool already but I really like what Geoff has done with his rads here. Looks cooler.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 424.4 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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  #9  
Old 12-30-2016, 09:19 AM
Tomcat RV4 Tomcat RV4 is offline
 
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Location: Jacksonville,Fl. 32246
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Default turbo subaru

Looks fantastic, taxi testing my EJ25 powered RV 4, but as of this point my cowling is UGLY. My rad underneath similar to Ross RV6,but ducting aluminum instead of fiberglass. Hope to have test pilot fly soon.Then will try to post photos on VAF..Tom
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  #10  
Old 01-02-2017, 07:49 AM
Norcalrv7 Norcalrv7 is offline
 
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Location: McKinleyville CA
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Looks great! Curious to see more numbers

Caleb
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