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

Prop for Ducted Fan Engine

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Old 12-19-2006, 09:49 PM
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ductedfan
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Default Prop for Ducted Fan Engine

I have a question concerning props for ducted fan engines. I have an Enforcer that is still in the box. I plan on putting an OS .77 ducted fan engine on it. I was wondering if I could put a reinforced prop (APC) or do I need a carbon-fiber prop??? BTW, what size prop would I need anyway??? Thanks in advance for all you help.

Ductedfan
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Old 12-19-2006, 10:11 PM
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Default RE: Prop for Ducted Fan Engine

COOOOOL! Almost like a Byro-Enforcer...

I apologize but I cannot remember what folks on here are using I would do a search for "Enforcer" or "DF prop".

Either way I bet Bob or Dave or someone will pop-in to add a solid suggestion.

Keep us us to date with your progress- The Enforcer is on my list of "must have's" in RC. Along with an Aurora/ Tiporare, and a turbine F-5
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Old 03-23-2008, 03:15 PM
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Default RE: Prop for Ducted Fan Engine


ORIGINAL: ductedfan

I have a question concerning props for ducted fan engines. I have an Enforcer that is still in the box. I plan on putting an OS .77 ducted fan engine on it. I was wondering if I could put a reinforced prop (APC) or do I need a carbon-fiber prop??? BTW, what size prop would I need anyway??? Thanks in advance for all you help.

Ductedfan
Any update on this project?
I'm thinking the same thing... 25,000 rpm d/f motor~ mount prop, install in plane~ Ear to Ear smiles all day long!

DM
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Old 03-24-2008, 01:05 AM
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Default RE: Prop for Ducted Fan Engine

Aloha! 25K is not realistic but you could get some real good speed numbers from a DF engine propped correctly. In the fan units they seem to turn 19K-22K on a prop it is obviously much lower.

I would recommend the Hurricane over the Byron if you are going to modify an Enforcer. Hurricane is under new ownership and the performance is FAR better than the old Byro stuff. See pics below for example. Byron, then Hurricane front then back-
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Old 03-24-2008, 07:56 AM
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Default RE: Prop for Ducted Fan Engine

for a .77 D/F I think you might want to try a 9 x 11 or 9 x 12 in continuous strand C/F if looking for all out speed...hopefully shoot for around 18000 -19500..might be a bit to much load to get to that rpm.. a bit of trail and error..which is not good when talking custom made C/F props...but when researched they aren't too hard to make with a little effort
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Old 03-26-2008, 07:52 PM
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Default RE: Prop for Ducted Fan Engine

I'd be concerned about the strength of the prop hub turning that fast, especially if you're thinking of trying as small as a 9 inch prop. I'd use a reinforced prop and start with a larger diameter, maybe 12 or so. Then cut down the tips in increments until you get the desired rpm.

My Byro Enforcer with an OS91 turns about 20K. It skoots along at about 140 mph. I'm sure it would be faster with a Hurricane fan but I couldn't justify spending the money for another 5 mph or so.

Now if you really want to go faster put a turbine on it. Mine was clocked at 160 mph with a Wren 54, and that was just before the new bearings were installed. Its got to be 5-10 mph faster now.

Joe
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Old 03-26-2008, 10:31 PM
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Default RE: Prop for Ducted Fan Engine

Joeflyer you are INDEED the Byro-Enforcer expert...And one of the nicest folks on RCU to boot.

Great pics!
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Old 03-26-2008, 10:43 PM
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Default RE: Prop for Ducted Fan Engine

If I can hi-jack this post for just a second- I am AGAIN getting a hold of a K&B 7.5CC and looking to put it on my Whiplash or Phenom, any thoughts on a prop. for this?

Thanks in advance-
James
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Old 03-27-2008, 09:31 PM
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Default RE: Prop for Ducted Fan Engine

hope somebody answers Razor's Q soon..I am putting my K&B 7.5cc engine on my Whip X...this carby sticking up so high is going to be a headache for a neat tight cowl
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Old 03-27-2008, 11:33 PM
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Default RE: Prop for Ducted Fan Engine

Good choice Haveblue!

I remember running a rev-up 9x7 I think (wood) but I never got it figured out.

Check out this pipe set-up I am getting with mine-
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Old 03-28-2008, 12:29 AM
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Default RE: Prop for Ducted Fan Engine

If you are willing to experiment, you can try to make your own custom props...using a Zinger as a blank. I know Daven and I (and a couple of others ) have made some Q40 props using 8X7 Zingers as "blanks".

Check out the Pylon forums for more on the subject.

With an O.S. .77 (just a WAG ) I'd say maybe a 9X9 or 8.5 X 10 Carbon or "custom" wood?

Razor...FWIW I have a K&B 6.5 with the backplate pump and DF carb set-up from a 7.5 on it and it turns an APC 8X8 at 19,000+ on 15% Powermaster...(the P/L fit is not the best though so it could do better )
Don't know if the 8X8 would be strong enough for the 7.5's power though?
I believe that "muffler" is a Mac's Quickie 500 style.
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Old 03-28-2008, 03:36 AM
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Default RE: Prop for Ducted Fan Engine

I've never seen a pipe like that before...I really like things out of the norm...I still have to figure out the best pipe for mine

I remember when I first got my K&B I asked in the engine forum about the best way to run these in ..a nice guy name charlie gave me a bit of information about props..I'll have to do a search and report back...my engine is a brand newie but what you can see is what I got so I didn't have any instructions for reference

I seem to remember something along the lines of 8.5 x 8.5 maybe then run it on a 8.5 x 9.5 this will be a little experimenting to see what works back..

Hey proptop thanks for the input..I dont know if I would try to carve my own props..I doubt I could get the pitch constant or accurate
I know there are pitch gauges available..might be fun to try it out but I would try on just a sport engine first

and I'll appologise up front to the author( DuctedFan) of this thread I didn't mean to hi jack this thread.sorry

..maybe we should do a thread on the K&B's ..what do you say Razor?
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