Here is a real motor. Going to set a speed record, get the AMA involved, make it official.

V

Alright,

here is the video of the GP Revolver at 160 mph - level flight. I was under the impression he had approached 200 with a 10s setup.

The thing is, the revolver is a "speed" design with a 59" span, thin airfoil and a high wing loading of up to 29 oz/sq ft. Specs call for a 55 size engine. People have put 91's in it and say they can't quite match the 10s electric setup.

I've been wondering actually whether 6s will do it (if it can be done). It seems to me that a very high kV motor (DF type) with a low drag prop on it (maybe 10" max diameter) and something more akin to 8s might be needed but I'm just speculating. Someone like Andy who is knowledgeable with electric setups might be able to better configure the e-power train but high cell count and low capacity (just to set the record) seems paramount. That wing (and stab) is also going to be crucial. The P7 should have less form drag than the Revolver.

This would be info to just start getting one's hands wet with the speed record attempt:

http://en.wikipedia.org/wiki/Parasitic_drag

That finish is going to be paramount too.

David.

So true Crank but I think e-power might be the way to achieve this if possible. The outer shell of the fuse has got to be bullet like.

David.

P.S. Finally found me a NIB OS 40 VF after a long search Love those engines!

David,
Check the C/L forums for VF40's. They used to be popular.
Chris...<br type="_moz"/>

Vince,

Is your Phoenix 7 from a vintage kit or is it a customized Hangar 9 ARF?  It looks awesome!


Rob

Rob - The silver and white P-7 is not mine. It was posted some time back, saved it, looking to copy what he did. I have the P-7 and P-8 kit's.

Vince

Here are some pictures of my Phoenix 8. I built this plane back in the 80's ,glassed and painted. It has s YS 60/Mac tuned pipe, spring air retracts. I have upgraded the servo's and a 2.4 JR Rx. It still flys occasionally and is very fast.

Steve

I'm not going to dispute anybody's speed claims. I just wanted to point out that the current FAI F3A (R/C) combustion engine speed record is 343.92 KM/hour or 213.702MPH. The current record for R/C electric motor propulsion is 361.00KM/hour or 224.315MPH. Breaking or even attaining 200mph is a bit more difficult than it may seem. Of course, the original motivation for this thread was just to get a 'honkin' P-8 in the air and that is definitely achievable.
One final consideration: the accuracy of radar detectors. To set an FAI approved record the speed must be timed over a specific distance in both directions (then averaged, I believe). Back in the 70's (when I was a lot younger, more energetic and very curious) I had the father of a friend (who was a police officer) provide some radar numbers on the airplane I was flying at the time; a Joy Products Mars (now called the Excalibur by Balsa USA). With the help of some friends, I then measured off 1/4 mile (1/8 mile on either side of me) and we performed some timed speed tests (this was actually a really fun physics project - fly and get credit for it ). Once we got the hang of the timing part of the distance test we got pretty consistent results - 10-15% slower than the radar readings. Of course this was about 35 years ago and I assume... that radar detectors have improved.
Good Luck and go fassssssst!

Danke

You may like this ones , alloy hub and not expensive really good ones.
Different size's available.
http://www.hobbycity.com/hobbycity/s...idProduct=4119

Must have been aHazzard County Sherrif's Department surplus radar gun!

David,
really? a 40 VF, I have one as well,, wish I would have known, its going up for sale as well,, soon ,,

If tyou are really serious, you may want to reference the current crop of Quarter 40 pylon racers, they are purpose built and are almost 200 mph airplanes, they are a LOT smaller than a pattern bird, with a LOT thinner airfoil. May give you some perspective on what is needed.

those are nice!!!

thoe chrome rims remind me of the vintage dubros ....

this thread is making want to build my Tipo.....

Mark,

had I only known, they are good for pattern too!

David.

my Phoenix 8 will be on the way here next week. after looking at the Phoenix 7 i mite buy a hanger 9 and take off the monocote **** and replace with carbon fliber tissue http://www.cstsales.com/carbon_tissue.html

this battery http://hobbyking.com/hobbyking/store...dProduct=14616
this motor http://hobbyking.com/hobbyking/store...dProduct=11143
CC 180 amp ESC 10X10 prop
this is what i plan to drop in my p-8

[]

just trying to make a great plane even better

200 mph will not happen with this design. Radar guns are notoriusly unreliable. Odd to take an aerobatic design with a thick wing and try to force very high speed out of it. The record setting designs will have no more than a 9-10% section. Speed is more about reducing drag than increasing power. Maybe build the wing with a moder pylon section Selig 6060 or something. Then you will have a fighting chance.

Hi,

That carbon fliber tissue I had never heard of before. How good is it compared to "Japanese tissue paper", silk, skyloftand other conventional covering material (I have used)?

/Bo

its just stronger than all other posted

This is gettin' complicated. How about putting a turbine in the P-8 ? Show up at a SPA contest, see if they would bend the rule's a little. Turbin-8.

Crank

got the glass today now i just need the plans