Variable Pitch props

[joe manor]

What is the biggest variable pitch prop and electric motor setup available? Are they used in big planes? I want reverse.

[rebell]

http://www.ramoser.de/home_e/varioprop_e/varioprop_e.html

[Smash McCrash]

I think he's looking for a prop that can be varied in flight. I have seen a setup for 50CC gas power, but, I haven't seen any for anything between flat foam and that one.

Mike

[Mick Molloy]

make you own from the tail rotor assy of a large rc heli and folding props from gliders

[rebell]

make you own from the tail rotor assy of a large rc heli and folding props from glidersNice idea. Only problem is that you need a hollow shaft on the motor to be able to control pitch in flight. Is there a way to do it without a hollow shaft motor? I would like to use VP prop not for reverse, but for variable thrust for low and high speed. I have a small hotliner with a solid shaft inrunner in it and would like to have PV prop on that.

[Mick Molloy]

Nice idea. Only problem is that you need a hollow shaft on the motor to be able to control pitch in flight. Is there a way to do it without a hollow shaft motor? I would like to use VP prop not for reverse, but for variable thrust for low and high speed. I have a small hotliner with a solid shaft inrunner in it and would like to have PV prop on that.

Why?? :confused:
the helis dont use them...

[rebell]

OK, I am not into helicopters so I don’t know how it works. One problem I see is that the blade attachment is 90deg from that of a fixed wing plane folding propeller. Is there a way to change that by replacing spares or do I need to do modifications on the existing attachment? I will also look at it when I see a helicopter again. What rpm will such a tail rotor be able to turn at? Will it handle 20k rpm?

Thanks again for that info.

[Mick Molloy]

I think you would be up for some machining and some work on calculating laods... I didnt say it would be easy ;) ...

I have seen it done on smaller slow fly models. ... what saize blades are you thinking?

[paintball_kidz]

http://www.backyardflyer.com/ME2/dirmod.asp?sid=17F3E50B054A4C1C9FDD81B36E52B522&nm=Site+Features&type=news&mod=News&mid=9A02E3B96F2A415ABC72CB5F516B4C10&tier=3&nid=5CF9BBA802E44F26B262BE1C6468552A

Thread
http://www.rcuniverse.com/forum/m_4425979/mpage_1/key_/tm.htm

this was the only one i found, it was invented by eddie weeks, but i dont think the sells them anymore you can try pming him on rcuniverse, hes still active. i know they were $650 each

[rebell]

... what saize blades are you thinking? 6". A big helicopter's tail rotor assembly will be to big I think. I will work on the idea and see if something comes from it.

Thanks.

[Mick Molloy]

6". A big helicopter's tail rotor assembly will be to big I think. I will work on the idea and see if something comes from it.

Thanks.
6 " should be very easy ... try this combo as an example only..
http://www.wattsuprc.com.au/product_detail.asp?pid=HS1189-72

http://www.wattsuprc.com.au/product_detail.asp?pid=HS1200

http://www.aircraft-world.com/shopexd.asp?id=1252

Blades have 2 mm hole as does grips......

Only problem may be shaft Dia and length infront of motor

[Mick Molloy]

You would also need to make an adapter of the links on the grips to give you the correct angle and range of movement for reverse and forward pitch..

[hoysome]

I plan on using the main rotor head when I eventually get around to building one of theese for myself. Just replacing the hollow shaft with a 5mm shaft, and using the swash plate as a bearing to do just what its suposed to do, without the multiple directions.

[Heather]

I doubt that the 6" folding blades will take 20,000 rpm for very long.

Heather

[Mick Molloy]

I found out the align 5" ones dont like 23000 today the hard way... :o