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

ducted fan with prop ???

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Old 01-05-2003, 07:41 PM
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liorgozlan
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Default ducted fan with prop ???

Can use a ducted fan engine with a prop ?

The carb location won't be a problem ? the air flaw will be much weaker ???

If the answer is yes should I use standard size prop ?

Thx
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Old 01-05-2003, 11:05 PM
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Default ducted fan with prop ???

If you make sure there is enough room for the carb to breathe it won't be a problem.

Do not use standard props on DF engines. Maybe with a OS .46 or a Rossi .53 you can get away with it, but on the larger engines CF props are advised if you don't want to go throwing blades around.
Some people trim down large APC props, which can also be done because then you have a thick and sturdy prop hub.
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Old 01-07-2003, 02:36 PM
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liorgozlan
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Default ducted fan with prop ???

Thank you for your reply.

What do you mean by enough room for the carb to breathe ? is it possible to mount a ducted fan engine on a regular pattern ship?

thx
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Old 01-07-2003, 03:23 PM
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Default ducted fan with prop ???

Well most DF engines have the carb mounted on the back plate, so make sure there is enough room between the horn and the firewall.
These engines suck a lot of air, and any restriction will cause a drp in power.

Why would you want to mount a DF engine on a pattern plane? For speed? There are faster planes around than pattern planes...
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Old 01-07-2003, 07:12 PM
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Default ducted fan with prop ???

You'd be hard pressed to fit any type of prop on the OS 46 VXDF, the crankshaft isn't long enough! besides, a D/F motor is an expensive way to propel a prop plane.
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Old 01-07-2003, 07:19 PM
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Default Oh, it's not hard..

Originally posted by StuartJJ
You'd be hard pressed to fit any type of prop on the OS 46 VXDF, the crankshaft isn't long enough! besides, a D/F motor is an expensive way to propel a prop plane.
You just have to WANT that prop on that engine..

And it's not very expensive at all compared to some engines designed for a prop...
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Old 01-08-2003, 08:06 PM
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Default ducted fan with prop ???

MVVS GRRT's and small APC props, yummy
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Old 01-09-2003, 03:34 AM
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Default Is the OS .46 VX-Df Shaft too short for a prop?

I hope not. That is what I am planning for my delta.
I looked at the picture, but its hard to say.
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Old 01-09-2003, 03:47 AM
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ChuckAuger
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Default Oh, it's too short...



You'll have to do a little adapting.....but it's not the end of the world.
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Old 01-10-2003, 12:06 AM
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ChuckAuger
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Default Tru Turn adapter...

I didn't know it, but Tru Turn makes a spinner adapter for "short shafts" Murrat found this out while looking for an adapter to turn down and e-mailed me about it. Looks good, I'd like to get my hands on one to see if it will be long enough for the D1 hubs. Also he said it required drilling the prop hub to 7/16" or .4735". The ones I made were .400", so it would require a little larger hole..or it could be turned down to .400" more than likely.

Good work, Murrat! Especially timely since the VXDF I got didn't have a fan adapter nut like the 46VRDF's had..


Anybody with a 46VXDF get a fan adapter with theirs?? Or did I get shorted...I bought this engine off an individual, but he didn't say anything about missing the adapter nut..
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Old 01-11-2003, 05:28 AM
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Default prop

I have a hyper 40 delta wing with a k&b 45 DF on it and use an APC 9+9 works great, but I only use the prop for a few flights, so I don't have to worry about stress fatigue to the prop
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Old 02-03-2003, 02:47 AM
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r-c-guy
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Default ducted fan with prop ???

Hi,
I have an os vrdf 46 on a stiletto mustang formula I aircraft. Prop is apc 9x8. 22k on the ground with 15% and a full wave pipe. Over 180mph in the air. It can be done and its a great running engine. Must use pipe pressure though. It will even idle!. I also use an os vrdf .65 fan engine in an old ez Dago Red. A sweet and moving combo!

randy
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Old 02-04-2003, 10:46 PM
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Default Long prop nut set

Hi LIORGOZLAN,

OS provides a LONG PROPELLER NUT SET.
Code Nr. 73101000 for 1/4"-28 or
Nr. 73101010 for 5/16"-24

This set will solve your problem to mount a long prop.
If a 1/4" fits to your engine, please do not hesitate to contact me.
I think I have one in my spare box.

Regards

Werner
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