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RE: Sig Wonder - 2/1/2013 3:30 AM   
combatpigg



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ORIGINAL: ehelibuff

I have a couple Cyclon .15's that are piped and turn up in the mid 30,000's. They have to run hand layed glass or carbon props. Wood or plastics would explode. I have a few nelsons as well that are the same story. My FAI one turns 42,000. no nitro. 80% methanol & 20% castor. It's for F3d pylon. Have it on a fiberglass/carbon delta wing like a Diamond Dust. They have no carbs. Huge venturi. They run on bladders. Needs pressure to feed. The .15 has the power of a .25 I'm actually selling a spare one that is like new still.


What rpm do you launch the 42,000 rpm nelson engine at..?
What size prop..?


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RE: Sig Wonder - 2/1/2013 3:39 AM   
ehelibuff


 

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Status: offline 		It's turning around 38ish static on the ground. The props were around 6.8-7.1 diameter and the pitch was around 8 or so. The F3D class really turn small props and high pitch props with a very narrow crop. Looks like a pencil. The MB engines they mostly run now are even faster! But they are around $600-800 each.

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RE: Sig Wonder - 2/1/2013 4:15 AM   
combatpigg



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Status: offline 		My Nelson FAI 6.5 cc [.40 ci] can only turn a 6.75x7 prop at 30,000 in the air.
I don't see how your .15 can turn a 7x8 at 42,000.
A 7x8 prop at 42,000 rpm consumes about 10 HP and gives you a resulting speed around 300 mph.....


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RE: Sig Wonder - 2/1/2013 4:26 AM   
ehelibuff


 

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Status: offline 		I was referring to my 40. The 15 is in the 30's

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RE: Sig Wonder - 2/1/2013 4:28 AM   
ehelibuff


 

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Status: offline 		And my .15 swings roughly a 6.75x4 something. They are handmade, not a factory prop. Plus being more rigid and thinner, they can turn higher. Less flex and very narrow crop.

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RE: Sig Wonder - 2/1/2013 5:30 AM   
combatpigg



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RE: Sig Wonder - 2/1/2013 7:34 PM   
MJD



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quote:

ORIGINAL: ehelibuff

It's turning around 38ish static on the ground. The props were around 6.8-7.1 diameter and the pitch was around 8 or so. The F3D class really turn small props and high pitch props with a very narrow crop. Looks like a pencil. The MB engines they mostly run now are even faster! But they are around $600-800 each.


MB 40 engines typically launch in the low 30's and run in the 33-34k range in the air, from everything I have seen about them, and I believe they are the fastest spinning F3D engines around today.



< Message edited by MJD -- 2/1/2013 8:07 PM >

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