Relentless Gets EFii upgrade

[DanH]

Originally Posted by mannanj

Be sure to test it before and after you put Robert Paisley's EFII systems in. Bet you'll be surprised!

Indeed you might.

I'm sure happy with my dual ignition system from EFII.

Conventional waste-spark inductive, using a proven SDS ECU, Subaru coils, and sensible timing. Good choice.

[Relentless]

Originally Posted by F1Boss

From the looks of that fuel controller, it seems like it MIGHT be easy to convert a std (NA) engine to this system. I gotta hear more - I'm about to drop $$$ into mags and an O/H 550 fuel system. I'd hate to do that and then find out that this is about the same cost....!!!

Robert: will you be at Reno?

Carry on!
Mark

Mark,

I will make sure I find you on the course and give a "special" fly-by so you can hear the engine purr with this new fuel system....

[F1Boss]

Originally Posted by Relentless

Mark,

I will make sure I find you on the course and give a "special" fly-by so you can hear the engine purr with this new fuel system....

I doubt I'll hear anything but a WHOOSH as you go by. I'm installing rear view mirrors as we speak so I can see you behind me...

See ya Saturday!

Carry on!
Mark

[flyboykelly]

Originally Posted by F1Boss

I doubt I'll hear anything but a WHOOSH as you go by. I'm installing rear view mirrors as we speak so I can see you behind me...

See ya Saturday!

Carry on!
Mark

Unfortunately not . Engine let go on the second test flight, according to their FB page.

[RV10inOz]

Ouch! Sounds expensive.

Any details on how ?.pics?

[glenn654]

Could a Nemesis fly in the Unlimited Gold class if it had the power of a turbo prop and could fly those speeds?
(assuming it is beefed up to handle the greater stresses)

Or must power be piston only and not just the power to fly in class?

I'd bet that with 700-800 shp it might out run the Mustangs and Bearcats.

Glenn Wilkinson

[boom3]

Originally Posted by glenn654

Could a Nemesis fly in the Unlimited Gold class if it had the power of a turbo prop and could fly those speeds?
(assuming it is beefed up to handle the greater stresses)

Or must power be piston only and not just the power to fly in class?

I'd bet that with 700-800 shp it might out run the Mustangs and Bearcats.

Glenn Wilkinson

An Unlimited Class race plane has to be capable of 6G's, piston powered, propellor driven, and weigh more than 4500lbs empty.

[osxuser]

Originally Posted by glenn654

Could a Nemesis fly in the Unlimited Gold class if it had the power of a turbo prop and could fly those speeds?
(assuming it is beefed up to handle the greater stresses)

Or must power be piston only and not just the power to fly in class?

I'd bet that with 700-800 shp it might out run the Mustangs and Bearcats.

Glenn Wilkinson

600-700HP gets you to around 400mph around the course at Stead. Give or take 20 for airframe. That has been the ceiling on the sport class for a while now. Nobody has yet built a motor/prop combo that can semi-reliably put down bigger numbers than that. LS based motor might make more, but PSRU and Prop are big issues. IO-540/-550 run into prop efficiency issues past 3200rpm or so, to say nothing of valvetrain issues. Gear lumps like the GTSIO-520/550 that Kevin has are finicky at stock power settings, and are VERY experimental with the builders (not much experience building them out there) and with the setup.

Then there is the IO-720. Very often tried, but lots of design issues related to the overall length of the engine and crank stiffness.

I'm bummed Relentless won't be there this year, but with the GTSIO, not particularly surprised.

[rv6ejguy]

Originally Posted by osxuser

600-700HP gets you to around 400mph around the course at Stead. Give or take 20 for airframe. That has been the ceiling on the sport class for a while now. Nobody has yet built a motor/prop combo that can semi-reliably put down bigger numbers than that. LS based motor might make more, but PSRU and Prop are big issues. IO-540/-550 run into prop efficiency issues past 3200rpm or so, to say nothing of valvetrain issues. Gear lumps like the GTSIO-520/550 that Kevin has are finicky at stock power settings, and are VERY experimental with the builders (not much experience building them out there) and with the setup.

Then there is the IO-720. Very often tried, but lots of design issues related to the overall length of the engine and crank stiffness.

I'm bummed Relentless won't be there this year, but with the GTSIO, not particularly surprised.

The top Sport Class engines have been putting out over 750+hp for a number of years now and both the direct drive Lycoming 540 and Conti 550s have been reliable if screwed together properly and operated properly, even with MAP as high as 75-80 inches and 3200 rpm. The fuel and spark department has to be dead on as do the turbos, ADI, spray bar systems. There is no room for error or malfunction at these power levels.

Success depends a lot on much high power flight testing prior to the event to make sure everything is just right. With the GTSIO, I don't think anyone has proven the reliability of the gearbox at these hp levels. Potentially, the geared engine is the way to go to make a lot more power and improve prop efficiency but there is some work to do to make it reliable. Darryl Greenamayer didn't have good success with his attempts at using a geared Conti a few years back either.

[glenn654]

I never imagined that those engines could produce that much power.

I suppose they'll have to go to nitromethane to get any more power.

A top fuel sport class racer.....

OR

A funny plane.....

Glenn Wilkinson