Buliding a full scale aircraft to take the loads of deceleration from in flight prop reversal would be a real challenge.

Wayne Handley did it with his turbine powered Raven for a bit, but it wasnt anything that was near as abrupt as what you see in the model videos.

There are alot of full scale planes that have reverse pitch to back up on the runway and stuff, but like FlinVR said about the raven, its not near as abrupt!

The vpp looks great! You have to see the video of it at hobby-lobby.com. In the future we will probably see a full scale edge with a vpp prop.

Too bad none of us will be alive to see that, bc right now we are having trouble producing VPP props that can handle over 10 oz of thrust. Much less a 14,000 LB airplane (not sure how much a full scale aerobatic plane weighs though.)

I just dynamic balanced the prop on a full scale Extra 300.
The pilot says hers weighs in around 1700 lbs.

looks like I was in the ball park!

anybody tried a VPP on a Slow Stick!!!! just kidding!! that would be awsome though!

I don't remember the exact year, but the famous Hanno Prettner won a World Champ using a Variable Pitch Prop in his Calypso, with a .60 engine. Apparently it helped him to reduce speed in nose-down verticals.
I also remember seen the VPP unit (very expensive), and I was told that it was a servo eater¡¡¡
Next championship Hanno went with "spoilers" attached to the retracts, which went partially down for that purposes... obviously a simpler solution.

If somebody can remember this, it would help me not to feel too old....

Thanks

This guy does, post #5.


http://www.rcuniverse.com/forum/Vari..._138653/tm.htm

They are now doing 100 cc gas VPP

http://www.variablepitchhobbies.com/

C-130's can back outta their parking spots. I have been in several that backed up on the ground. I think that qualifies. they also reverse when they land to help reduce the rollout after getting it on the ground. i think it would be a disaster if it happened in flight though. not sure, but i think there is some kind of failsafe that prevents that.

Can you say "drop like a rock?" Yeah, there is a failsafe that keeps that from happening. I used to work on 130's for the Air Force, and I had the same question. Engine troops and crew chiefs cleared that up for me.

that's what i figured. i am a sheetmetal troop currently working 130's and A-10's in the USAF. I never asked that question, but figured that was the case. I guess i can show some pilots the vids of the 4d foamies and ask if they have the guts to give it a try... without me onboard!

my uncle does c-130 training in st. joseph, missouri. they do some crazy stuff with those things. im sure they have the guts to try it... if there were a possibility of success!

Most 1:1 scale prop planes use variable pitch. They don't do 4D with them though. Also, Almost all helicopters have variable pitch blades, including 3D rc helicopters.