What turbine to use for the Yellow A-4 Skyhawk??
 

Hey guys, canyou tell me whisc is better in terms of reliability, the Jetcat P-60, or the Wren-44 gold with autostart. I know the Jetcat has 13lbs of thrust comared to the wren @ 8lbs, but I dont need tons of power because its going into my Yellow ARF A-4 Skyhawk that weighs about 9-10lbs 56" length 40" wing span. What do you gus think? Bothe cost the same.....$2495.00

-John

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

I like them both.

For that plane I would opt for the 44 though.
It burns less fuel so you wont need to carry a ton for a descent flight

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

I dont own either one but Ive seen a few of each at different jet events. For the A-4 Id be inclined to go with the Wren for reasons like size, weight and fuel burn. On the other hand the P-60 might be the way to go because it can power a wider range of larger airplanes down the road. From what little I know they are both fine engines and Im sure you'll be quite pleased with either one.

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

Will 8lbs be ebough for that kit? I mean, I've seen it with a Dynamax and it flies pretty marginal.

I'm no turbine expert by any means, but a P-60 will fit on far more airframes than a 44mm. Wren 44 is great for those very few Sierra airframes and similar.

Good luck!

David

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

Hey turnburn, no Simjet yet. waiting.....waiting....waiting.....wainting

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

Ive flown as much as 14lbs on a wren 44 so far with no problems

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

P- 60 with a wet tank under the fuse. Either way I think they are both great power plants however the P-60 is more versatile.

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

Hey NY what happened to the Helis?

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

I still got the Heli's and they are still cool.....but I'm and X-Air Force F-16 Pilot who loves Jets! Guys, how is the p-60 more Versitile? I was told that you lose some thrust when you put the P-60 in a jet, compared to not losing anything with the wren-44. Also, how did you get the wren turbin up to 14lbs of thrust?

-John "The Rookie"

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

John,

ALL turbines, even the Wrens, lose a little thrust when they push the exaust through a pipe. They lose no thrust only in a pipless airframe like a Bobcat or the like...

I think what Shok meant in his statement was, he has flown the 44 in airframes up to 14lbs. in weight, not thrust.

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

The Wren pipe is supposed to slightly increase thrust, but it would work with other engines as well.

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

yes, the weight of the plane was 14lbs

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

8 lbs. is plenty of thrust for the Yellow A-4. Before JetCat, before the "Hammer," Bob Wilcox flew a Yellow A-4 with an FD 3/67 and it was awesome. Remember the Golden West Turbine?

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

lighter than the p60, but heavier than the MW44 is the FS 70. More power then both and cheaper

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

what is a FS-70, who makes it, and is it realiable. How many lbs of thrust does it have. Also, what's it's diameter?

-John

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

Fun Sonic FS 70

price now @ 1600 Euro....

Martin

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

http://www.funsonic.com/index1.htm

roughly 1740 US$

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

The GWM FD 3/67 also flew the BVM F-86 very well!

You just can't compare the static thrust ratings of DFs to the thrust rating of turbines. They're not the same animal.

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

Im not certain about this but I think the Wren tailpipe design still has a thrust decrease, it is just LESS of a decrease than a straight thru constant diameter pipe. I dont think it is actualy a thrust increase. I'll certainly stand corrected if Im mistaken.

The Wren 44 is plenty of power for this airplane assuming it is done correctly.

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

I beleive they call it the "Wren Thrust Augmenting Pipe". It increases thrust but I don't know off hand by how much or what sizes besides the 54 is available. There is a formula for the dimensions that would apply to all engines.

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

Ill have to go back and find the magazine article. If it truly increases thrust all manufacturers should be copying it.

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

These pipes have a diferent shape. The first get wider, and then have a cylindrical shape. The thrust increase is paid with a loss of thrustvelocity.

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

The Wren thrust augmenting pipe design does increase thrust.

I used the Wren (John Wright) design specs when I built a pipe for a JetCat Titan in a Eurosport. I got a 3 pound thrust increase using this pipe as compared to running the engine with no tailpipe.

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

Yes, I was thinking that maybe there is an increase in static thrust but a decrease in velocity but haven't really read up on it.

RE: What turbine to use for the Yellow A-4 Skyhawk??
 

Ok, I stand corrected. So now if i understand correctly an increase in static thrust would mean greater acceleration ? And a decrease in exhaust velocity would mean a reduced top speed of the airplane ?