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Old Jan 29, 2009, 01:19 AM
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Variable pitch propellers

Hello ppl, I'm new here and this is my first post. I'm planning to build a variable pitch prop.... Anyone here trying to do the same thing or anyone having any links or ideas regarding this.. plz reply here..... I need a variable pitch prop to fly a twin engined plane weighing about 9-10kg.... first I'm going to make a small model of the prop and test it and then go for the final one...
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Old Jan 29, 2009, 06:38 AM
Zor
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Is it to be adjustable only on the ground or while airborne?

If airborne as well make it constant speed.

A very interesting challenge to be patented.
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Old Jan 29, 2009, 09:47 AM
Guz
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Just in case you didn't know, it's out there already. Changing pitch while in flight. Do a search for "4d propeller"
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Old Jan 29, 2009, 10:34 AM
Zor
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Quote:
Originally Posted by Guz
Just in case you didn't know, it's out there already. Changing pitch while in flight. Do a search for "4d propeller"
Sorry, I was considering a variable pitch propeller for a model airplane with an engine. Something like a model of a full size airplane.
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Old Jan 29, 2009, 11:45 AM
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Quote:
Originally Posted by v.sabarish
I need a variable pitch prop to fly a twin engined plane weighing about 9-10kg.... first I'm going to make a small model of the prop and test it and then go for the final one...
Will your model be electric or fuel engine powered? As Guz posted, there is a variable pitch prop on the market, but it's meant for electric motors.

Information also needed is *when* you want the prop to change pitch (the *how* will have to be worked out after the *when* question is answered).

"Variable pitch" can mean to be able to change the pitch of the prop blades and secure them in place, and it can also mean that you can change the pitch of the prop blades while the motor (or engine) is operating.

It sounds like a fun project, but I just gotta ask: *why*?

EJWash
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Old Jan 30, 2009, 04:26 AM
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I'm sorry people, may be I wasn't too good with my question. Actually, we're going to make a variable pitch prop that can change pitch when it's airborne and it's for an IC engine.
I've done some googling, but I didn't find any satisfactory results.. I found a few.. but when I read abt the details, i found that those props are for very small aircrafts.. weighing not more than 400g or so...
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Old Jan 30, 2009, 04:31 AM
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Our plane would be weighing some 8-10 kg.... and we want to use IC engines, just bcoz they are more difficult to operate

@ EJWash

I've just want to make a twin engined plane.. and we wanna use VPPs.... that's it.....
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Old Jan 30, 2009, 04:32 AM
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If any1's made any variable pitch props.. or if any1 has any links regarding making one, plz do send them to me...
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Old Jan 30, 2009, 07:20 AM
An itch?. Scratch build.
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I don't think I have ever come across a variable pitch propeller for a model size IC engine that could be changed in flight. Electric yes, IC no, other than pitch change on the ground when stationary.

The major advantage with electric is you can run a hollow drive shaft for the pitch change mechanism to run through.

I suppose a model helicopter head could be modified to do something similar, but then most model fliers would ask why bother, The throttle works probably as good, (though some efficiency may be lost).

Now if it was a military contract..................money is no problem, someone will make anything you want, (at a price ).
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Old Jan 30, 2009, 07:42 AM
An itch?. Scratch build.
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Have a look/read of this site - Scale Warbird Prop Drive, though this is a constant speed variable pitch prop.
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Old Jan 30, 2009, 07:53 AM
JustFlying
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You think of it, somebody has done it. I was thinking and asking about VP props for high speed models here on RCG before. I made an adjustable prop and is still working on a VP prop for my purposes. And no, the existing props will not work for me, and I looked at eggbeater parts, it does not work for a plank.

Here is an example of a VP prop for a DA twin engine.
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Old Jan 30, 2009, 07:56 AM
An itch?. Scratch build.
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Some people do amazing piece of engineering, the picture(s) show it best.

From the The Joe Martin Foundation Museum site scroll down to item #145, JT 1800 9-Cylinder Radial Model Airplane Engine, .......'It sports his custom designed hydraulic controlled variable pitch propeller'.

Now if you have a good machine shop..............
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Old Jan 30, 2009, 07:58 AM
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O, I forgot to mention, the one I work on will be a folder prop as well. The picture I posted is not mine, I found it on the net.
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Old Jan 30, 2009, 10:53 AM
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And I'm just a beginner. I never built any plane myself before... I'm just about to start...
right now, we wanna build a VP Prop....... that's the reason I've been asking about that....
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Old Jan 30, 2009, 12:44 PM
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Quote:
Originally Posted by eflightray
Some people do amazing piece of engineering, the picture(s) show it best.

From the [URL=http://www.craftsmanshipmuseum.com/KnappCol.htm]
WOW!!!

Thank you for posting this link eflightray. Each is a work of art, to be sure.

EJWash
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