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

Nelson Q40 without a home.

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Old 09-11-2009, 03:36 PM
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Default Nelson Q40 without a home.

Hey everyone. I have a strong running Nelson Q40 motor without a place to call home. I want something that is as fast as humanly possible, while staying reasonable in cost. Spending 600 bucks for a Q40 airframe is out of the question, as I would rather spend that kind of money on a warbird or 3D machine. Any suggestions? I have a clipped wing Lanier Predator with a Q500 Nelson on it, and frankly, have flown it so many times that it is no longer "fast." Thanks!
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Old 09-11-2009, 04:07 PM
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Default RE: Nelson Q40 without a home.

i'll give it a home!![sm=teeth_smile.gif]
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Old 09-11-2009, 04:18 PM
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Default RE: Nelson Q40 without a home.

Why not build a sleeker fuselage for the Q-500 wing? It can still be fairly simple. I'd get a Q40 engine mount and get to work on it.
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Old 09-11-2009, 06:48 PM
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Default RE: Nelson Q40 without a home.

can't for the life of me understand willingness to spend money on a 3d plane but not on a 200mph plane where quality should matter, if only for your own safety
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Old 09-11-2009, 08:18 PM
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Default RE: Nelson Q40 without a home.


ORIGINAL: RocketRob

can't for the life of me understand willingness to spend money on a 3d plane but not on a 200mph plane where quality should matter, if only for your own safety
And for the safety of the really expensive engine in the nose too, I would think!

We'll soon find out if 32" deltas make a good home for them, stay tuned to CP's progress on his contraption.

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Old 09-11-2009, 11:19 PM
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Default RE: Nelson Q40 without a home.


ORIGINAL: MJD


We'll soon find out if 32'' deltas make a good home for them, stay tuned to CP's progress on his contraption.

MJD
It already has been done with excellent results. not sure if 200 mph has been confirmed but I understand 180+ has.
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Old 09-11-2009, 11:35 PM
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Default RE: Nelson Q40 without a home.

That's not an FAI engine though. Aren't they quite a bit snottier? CP's is some fearsome piped RE 29k+ thing running on .15 props and capable of pulling his arms out if he forgets to let go in terror.

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Old 09-11-2009, 11:54 PM
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Default RE: Nelson Q40 without a home.

I think the delta being pulled with a 7 inch prop will go over 200 in a dive, but bleed off speed quickly on the flat. We'll see......this is as far as I'll ever want to take it unless I win a lotto.
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Old 09-12-2009, 12:46 AM
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Default RE: Nelson Q40 without a home.

We don't know exacty what the OP has.
cp, do you know the differece of your Q40 rear exhaust engine and Dennny's Q40 side exhaust (besides exhaust)?
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Old 09-12-2009, 01:23 AM
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Default RE: Nelson Q40 without a home.

Mike, the Q40 turns a 7.4x8 in the mid 20s in the air. The FAI turns a 7x7.5 about 30,000. The Q40 has normal liner and crank timing, just big ports. The FAI engine has pretty radical timing and large ports. A typical FAI set up uses over 190 degrees of exhaust. The FAI engine has to be finger choked while it's running to get near staged rpm or it will just sit there and idle, spitting fuel out the venturi. The Q40 is much more flip and go.
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Old 09-12-2009, 02:02 AM
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Default RE: Nelson Q40 without a home.


ORIGINAL: RocketRob

can't for the life of me understand willingness to spend money on a 3d plane but not on a 200mph plane where quality should matter, if only for your own safety

Your assumption that when I say that I don't want to spend 600 dollars on a fast airframe does not mean I want to sacrifice quality or endanger me or anyone else. Please do not insult my intelligence insinuating that I want something "cheap" that just goes fast. I can't for the life of me understand the willingness to insult me just because I wanted some opinions on airframes. The reason why I would rather spend that much money on a 3D plane is because I can fly those all day, where as a quickie might go up just once or twice.
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Old 09-12-2009, 02:14 AM
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Default RE: Nelson Q40 without a home.

If you really want a rush, hook that engine up to a C/L plane on 60 foot lines.
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Old 09-12-2009, 08:26 AM
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Default RE: Nelson Q40 without a home.


ORIGINAL: combatpigg

If you really want a rush, hook that engine up to a C/L plane on 60 foot lines.
I remember year-r-r-s ago, flying a profile .049 ukie in our backyard with my big brother. For some reason we were flying where we'd have to fly under the clothesline on one side of the circle. On lap one, or was it two.. I hooked it on the lines and watched it perform about 700 10 foot diameter knife edge loops as it gradually wound the lines around and around and around the clothesline.. until the engine finally quit. It was entertaining as I recall.

I hate to think of that scenario with a human who just can't turn fast enough with a 3hp ukie.. gee that wouldn't be funny at all.. not one bit..

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Old 09-12-2009, 09:16 AM
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Default RE: Nelson Q40 without a home.


ORIGINAL: combatpigg

Mike, the Q40 turns a 7.4x8 in the mid 20s in the air. The FAI turns a 7x7.5 about 30,000...
Thanks for the explanation cp. Prop pitch speed of about 220 mph, hmmm... Can't wait!
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Old 09-12-2009, 02:54 PM
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Default RE: Nelson Q40 without a home.

Yes, it will be interesting to see the theoretic speed collide with the real world speed.

The biggest advantage of Q40 over FAI is prop selection. FAIs aren't supposed to be run with those chopped carbon APCs, either.
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