Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

GP Minnow Done

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Old 07-07-2007, 08:56 AM
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phjoker
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Default GP Minnow Done

Well I maidened the minnow the other day.
First flight DEAD STICK after 1 lap around. she just floated right in
The other flghts were good trimed her all out she flys great.Just gotta remember to kill the throttle
a little bit earlier on the landings.
I changed the control horns and pushrods to HD.
Now I need to get it on Radar.
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Old 07-07-2007, 09:37 AM
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Mike Connor
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Default RE: GP Minnow Done

That looks really nice. Is that a Jett muffler I see? What engine is in it?
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Old 07-07-2007, 10:39 AM
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phjoker
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Default RE: GP Minnow Done

Jett 90lx with the Toni extensions 11X8 Apc Right now the rpm's seem to like 14,150. I had it lean out in the air on the first flight so the
14150 looks to be it for now.
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Old 07-07-2007, 08:00 PM
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Cyclic Hardover
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Default RE: GP Minnow Done

Something I want to bring up to you is the nut on the high speed needle. I was constatantly setting mine on the ground where it was dead on and would go rich in flight. Drove me nuts for a couple weeks.That nut that holds the high speed needle was loose
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Old 07-07-2007, 08:49 PM
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phjoker
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Default RE: GP Minnow Done


ORIGINAL: Cyclic Hardover

Something I want to bring up to you is the nut on the high speed needle. I was constatantly setting mine on the ground where it was dead on and would go rich in flight. Drove me nuts for a couple weeks.That nut that holds the high speed needle was loose
THANK YOU I am going to have to check that the next time I fly. That is the same thing that was happening to me.
Thank You
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Old 07-08-2007, 11:12 PM
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rmenke
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Default RE: GP Minnow Done

phjoker
Gotta be more in that 90 LX than 14,150. my 90L turns almost 15,500 on the stock muffler Powermaster fuel 15%. Keep a 1/4" small wrench in the tool box and keep that needle nut tight enough to feel some friction on the needle. It will eventually take a set. If you don't keep it tight, strange things will happen. ENJOY
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Old 07-09-2007, 02:17 AM
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Flyer95
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Default RE: GP Minnow Done

I think the Toni extension changes the tuning and droping some rpm. Maybe with the new longer tuned lenght he can have better use of a 11x9 or 11x10?
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Old 07-09-2007, 07:19 AM
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Default RE: GP Minnow Done

I know the toni extensions drop the rpms. When I had this engine in the F-16 it was revven around 15,500 and loved it there.
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Old 07-09-2007, 08:50 AM
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Default RE: GP Minnow Done


ORIGINAL: phjoker

I know the toni extensions drop the rpms. When I had this engine in the F-16 it was revven around 15,500 and loved it there.
Your rpm with the extensions looks about right. The 11x8 works nice....... and you can try an 11x9 too... usually gets on the pipe pretty well.
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Old 07-09-2007, 09:26 AM
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Default RE: GP Minnow Done

I also run extensions on mine. You guys are forgetting that altitude, weather humidity , DA and the rest of it play a major role in how these perform. I'm at 5000ft and on my best day (winter), I get only around 12,500 rpms with a 12/6apc and nothing I can do about it.

Shoot, their is an automatic 500rpm deduction just for being in Jersey! Then add the type of air, heat, humidity etc. Denver and Albuquerque are at the same altitude, were dry and they are humid. Can get very different readings
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Old 07-09-2007, 12:39 PM
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Default RE: GP Minnow Done

the 11 X9 is the next prop to try
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Old 07-09-2007, 12:45 PM
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Default RE: GP Minnow Done

Yeh, go with the pitch. I have an 11/11 apc around here somewhere. Forgot what I was going to use it on but whenever I remember, I'll have it. I don't know what time of day your doing all this but early am and late pm will bring you a substantial difference
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Old 07-13-2007, 12:41 PM
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Default RE: GP Minnow Done

Hey Cyclic Hardover Thanks Again. That was the problem I tightened the nut and away she went. No more problems

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Old 07-13-2007, 06:04 PM
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Default RE: GP Minnow Done

Super looking plane! I'm interested in hearing how fast it goes. The muffler extension deal is the first I've ever heard about such a large drop off.......proves that the standard system is in a pretty high state of tune.
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Old 07-14-2007, 07:31 AM
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Default RE: GP Minnow Done

I will find out Monday Night when I go flying how fast.
Thats when the radar gun will be at the field.
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Old 07-18-2007, 05:06 PM
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Default RE: GP Minnow Done

I have the same setup with my Minnow. I clocked it with a 12x6 at 133mph. Curiously, when I tried 11x8 and 11x9 props, I didn't percieive much difference in speed (although I didn't clock it). I don't believe this airframe will squeeze too much much more out in any case. The 12x6 just seemed to be the right fit here. I have a Patriot XL and a King Kobra where the 11x8 and 11x9's work best, maybe related to fuselage cross sectional area. Unfortunately, I was at the field about a year ago and an LT-40 crashed full throttle into my Minnow sitting in the forks on the ground. Just destroyed the wings, haven't had a chance to build a new set. The LT-40 ricocheted into a pole about 2 feet from me and my back was turned. Valuable lesson learned here, don't turn your back to the flight line while anyone is flying.

Jonathan
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Old 07-18-2007, 05:23 PM
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Default RE: GP Minnow Done

One additional mod I did was to add a cover to the left side of the cowling. I believe I made it out of some clear plastic lying around and it really seemed to resolve the overheating issues I was having. It's not present in this photo but fits just inside of the hole.
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Old 07-18-2007, 09:45 PM
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Default RE: GP Minnow Done

I have the 11X8 on it now and it was clocked level flight into the wind (5-7MPH) AT 124MPH have the rpms at 14,750. I do have an 11X9 and a 12X6 that
I would like to try.
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Old 07-19-2007, 07:48 AM
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Default RE: GP Minnow Done

Yeah, try the 12x6....

with the extentions and the size of the plane it probably will perform a bit better with the 12x6
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