RE: Your kidding,,,,,,  
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All Forums >> Electric Aircraft Universe >> VPP - Variable Pitch Prop 4D flying >> RE: Your kidding,,,,,,
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RE: Your kidding,,,,,, - 5/25/2005 3:08:12 PM   
Tommy_Gun



Posts: 706
Joined: 4/7/2004
From: Ione, CA, USA
Status: online 		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.

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RE: Your kidding,,,,,, - 5/25/2005 3:32:24 PM   
Breakstuff5050



Posts: 589
Joined: 5/8/2004
From: Shelby, NC, USA
Status: offline 		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!

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RE: Your kidding,,,,,, - 5/27/2005 3:32:05 AM   
Fly-n-3D



Posts: 479
Joined: 9/26/2004
From: Columbia, SC, USA
Status: offline 		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.

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RE: Your kidding,,,,,, - 5/27/2005 4:15:09 AM   
Breakstuff5050



Posts: 589
Joined: 5/8/2004
From: Shelby, NC, USA
Status: offline
quote:

ORIGINAL: RC13

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.)

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RE: Your kidding,,,,,, - 5/27/2005 9:22:20 PM   
Tommy_Gun



Posts: 706
Joined: 4/7/2004
From: Ione, CA, USA
Status: online 		I just dynamic balanced the prop on a full scale Extra 300.
The pilot says hers weighs in around 1700 lbs.


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RE: Your kidding,,,,,, - 5/27/2005 10:20:59 PM   
Breakstuff5050



Posts: 589
Joined: 5/8/2004
From: Shelby, NC, USA
Status: offline 		looks like I was in the ball park!

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RE: Your kidding,,,,,, - 6/2/2005 8:14:38 AM   
Dr.Watson


 

Posts: 390
Joined: 3/2/2005
From: colville, WA, USA
Status: offline 		anybody tried a VPP on a Slow Stick!!!! just kidding!! that would be awsome though!

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RE: Your kidding,,,,,, - 6/6/2005 10:31:18 PM   
martinoto


 

Posts: 188
Joined: 5/13/2003
From: Buenos Aires, ARGENTINA
Status: offline 		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

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RE: Your kidding,,,,,, - 6/7/2005 4:24:31 AM   
mdavies31


 

Posts: 191
Joined: 11/8/2002
From: Bakersfield, CA, USA
Status: offline 		This guy does, post #5.


http://www.rcuniverse.com/forum/Variable_pitch_props/m_138653/tm.htm

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       Post #: 34

RE: Your kidding,,,,,, - 9/20/2006 4:12:10 AM   
EddieWeeks



Posts: 1131
Joined: 12/27/2001
From: Baton Rouge, LA, USA
Status: offline 		They are now doing 100 cc gas VPP

http://www.variablepitchhobbies.com/

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RE: Your kidding,,,,,, - 11/15/2007 7:37:29 AM   
troposcuba



Posts: 358
Joined: 10/18/2006
From: raeford, NC, USA
Status: offline 		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.

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RE: Your kidding,,,,,, - 11/15/2007 11:43:24 AM   
Bugzilla



Posts: 440
Joined: 1/4/2006
From: Colorado Springs, CO, USA
Status: offline
quote:

ORIGINAL: troposcuba

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.

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RE: Your kidding,,,,,, - 11/15/2007 11:46:35 PM   
troposcuba



Posts: 358
Joined: 10/18/2006
From: raeford, NC, USA
Status: offline
quote:

ORIGINAL: Bugzilla


quote:

ORIGINAL: troposcuba

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!

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RE: Your kidding,,,,,, - 11/21/2007 8:05:51 PM   
CoytAW


 

Posts: 50
Joined: 9/14/2007
From: columbia, MO, USA
Status: offline 		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!

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       Post #: 39

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