GP5 takes flight

[Apteryx]

Re: GP5 takes flight

...And Eric, what do you think, does it have adequate vertical tail area/moment?

Peas-
Why not ask Dave, no knock on Eric, I value his opinion too, but Dave is collecting the empirical data.
A test pilot's report, beats an educated guess, any day.

Patience Peashopper, and stay tuned...

Paul

[Blue Foam]

Re: GP5 takes flight

Peas-
Why not ask Dave, no knock on Eric, I value his opinion too, but Dave is collecting the empirical data.
A test pilot's report, beats an educated guess, any day.

Patience Peashopper, and stay tuned...

Paul

I too will defer to Dave, since he's the one closest to the program. On the WAG front, 500+ continuous HP is possible using endurance racing parts. Although I prefer headers over stubs, the jury is still out over the benefit of headers vs. the tighter cowl. Two of the top 5 F1's use stubs, 3 use headers.

From the pictures, it would seem that the radiator ducting rises and falls under the pilot's knees; very tight packaging.

The GP-4 was reported to be a good handling airplane and this is very similar in tail size and arm. Have to wait for Dave on this.

[kenf]

Re: GP5 takes flight

Isn't this the racer that was originally supposed to be called "Heartbeat" to play on the then current Chevy advertizing campaign?

[marada mx3]

Re: GP5 takes flight

Does the pilot sit on top of the radiator or behind it? And Eric, what do you think, does it have adequate vertical tail area/moment? And given the prop, how many ponies, 350?

I'm guessing here with the exhaust spacing, but here's a thought for Ford lovers....

Here's a thought for ford lovers

In all actuality, the exhaust spacing doesn't necessarily prove a small block Chevy. It could be a Mopar.

There's a reason 95% of open wheel sprintcars, modifieds, late models, etc use Chevy and some Mopar. If you're going to adapt an automotive based engine to air racing, you would definitely use a Chevy, or perhaps a Mopar. It is the most logical reason by far.

I bet Magnum 440 could chime in with some thoughts on this.

Just my .02

Tommy

[First time Juke]

Re: GP5 takes flight

in all seriousness though, i'm really digging this plane. alot of it is what i had envisioned for my conventional design (as some of you may remember)

Matt,

That was the first thing on my mind...they let Matt design it.

regards,

Juke

[Tin Man]

Re: GP5 takes flight

Looks like the belly scoop has a flow divider. I'm guessing the oil cooler is down there also. The prop tips are certainly interesting. don't recall seeing any that squared off before.

[Blue Foam]

Re: GP5 takes flight

This appears to be either the next model in the Osprey Aircraft line or a single-seat, V-8 version of the GP-4. If it is the latter, it is a legal Sport Class racer RIGHT NOW!!!

If the Sport Class determines it to be a unique model and not a modification of a kit that has several flying and many sold, then we're hosed. It's way too small to make 4500 lb; 2500 is more likely.

Odd to quote myself here but a thought just occurrred to me...

Although the aircraft has GP-5 on it, the modifications from the GP-4 airframe are very close to the modifications of an RV-4 to F-1 Rocket status:

1. New and larger engine;
2. New cowling;
3. New cooling (OK, the sccop is more extensive than a Rocket's oil cooler scoop, but it's the same theory);
4. Single seat vs. side-by-side (the Rocket is single seat vs. tandem).

To me (and IM<HO) this means that it SHOULD be legal Sport Class racer since many GP-4's are out there and it meets the homogulation rule.

Thoughts?

As for the prop, one thing we should all learn from the 2005 races is that Hartzell absorbed a LOT of power with that little three blader. Seeing the GP-5 run 500 HP through the same size prop is on the same level.

[morss]

Re: GP5 takes flight

eng install

[morss]

Re: GP5 takes flight

bigger

[morss]

Re: GP5 takes flight

try try again

[morss]

Re: GP5 takes flight

I quit but its big on my screen
I can really see the details of installation

[Apteryx]

Re: GP5 takes flight

To me (and IM<HO) this means that it SHOULD be legal Sport Class racer since many GP-4's are out there and it meets the homogulation rule.
Thoughts?

There's precedence for all the Sport considerations, and although RARA is said to be "reconsidering" the 4500lb rule, I wouldn't hold my breath.
Dave says it flies great. Love to see it on the pylons.

Paul

[matt]

Re: GP5 takes flight

thanks for the thought dave, i do appreciate, the small pictures do answer a few questions.

thanks again

matt

[morss]

Re: GP5 takes flight

last try

[matt]

Re: GP5 takes flight

thanks dave, you're the coolest.

wait, it's normally asperated?