New Products Flash Sale
Thread Tools
Old Nov 30, 2010, 06:52 PM
snivilous is offline
Find More Posts by snivilous
High Altitude Specialist
snivilous's Avatar
to actually answer your question, which i dont know if anyone has, your thrust must increase to/near 1:1 the closer you get to being perfectly perpendicular to the ground. Im not sure if thats a linear equation or not, but if you want to fly at 89.5 degrees, then you obviously need just below a 1:1 to sustain level flight due to the little air thats getting redirected from your aircraft.
Sign up now
to remove ads between posts
Old Dec 01, 2010, 12:04 AM
TTRotary is offline
Find More Posts by TTRotary
Rangers Lead the Way
There is that guy Jason who mods all the little EDFs like the Starmax F-18 with slats and flaps and he gets them to do all kinds of crazy stuff without TV. That said, George-Styria, that was some demonstration of flight skills.
Old Dec 01, 2010, 12:49 AM
Steve C is offline
Find More Posts by Steve C
Carbon fiber is our friend
Steve C's Avatar
Quote:
Originally Posted by ditchit View Post
F16s are great for high alpha slow flight. Don't understand why though.
The strakes produce a vortex at high AOA that basically grabs air and throws it down on top of the wing, keeping it from stalling. You have a lot of drag in this condition, but no stall.

I attached a simple drawing of it.
Old Dec 01, 2010, 02:07 PM
Richie Simpson is offline
Find More Posts by Richie Simpson
Registered User
I think everyone missed what he said? "slow speed high alpha flight maneuvers....???? " It is the slow speed and maneuvers where it gets tricky<g>

Even an old man like me can come straight down the runway at say 30+ mph at maybe 40+ degrees, but I ain't going to even try any maneuvers<g>

Perhaps he will tell what he considers slow and what maneuvers planned?
Old Dec 01, 2010, 02:16 PM
Richie Simpson is offline
Find More Posts by Richie Simpson
Registered User
Erik,

I love the garden, and the molds & baby are nice also<g> Who needs high alpha when you have this.
Old Dec 01, 2010, 03:06 PM
TTRotary is offline
Find More Posts by TTRotary
Rangers Lead the Way
Quote:
Originally Posted by Steve C View Post
The strakes produce a vortex at high AOA that basically grabs air and throws it down on top of the wing, keeping it from stalling. You have a lot of drag in this condition, but no stall.

I attached a simple drawing of it.
Another cool thing I learned on here...thanks.
Old Dec 01, 2010, 03:19 PM
Erik v. Schaik is offline
Find More Posts by Erik v. Schaik
My project: FAIREY DELTA 1
Erik v. Schaik's Avatar
Hi Richie,

Thx for the nice comment!
Yeah I know I have a very high wishlist
greets!
Erik
Old Dec 01, 2010, 05:06 PM
stoneenforcer is offline
Find More Posts by stoneenforcer
High Dynamic Thrust
stoneenforcer's Avatar
its is possible on some models. My Jepe F16 90mm on 6s,... I could put into a nice HIGH alpha easily from one side of the field to the other. pretty much walk the thing on its tail.
Old Dec 01, 2010, 06:47 PM
Air Head is offline
Find More Posts by Air Head
Registered User

Perhaps he will tell what he considers slow and what maneuvers planned


Yes I can.

I am thinking of a slow speed routine like what I see the Mig 29 do. It almost seems to be flying in slow motion.

Rather than zooming down the runway at 200 miles per hour and being out of sight in a matter of the blink of an eye.

My idea is for a close in routine that could be flown in a small confined area.

Right in front of you. Seems like a lot of the response is right down this alley.

I am thinking its going to be more like a 3D model. I was just looking for a bit of realisim, not a flip and flop all over the place flyer.

Thanks for the input guys....
Old Dec 01, 2010, 07:57 PM
turbonut is offline
Find More Posts by turbonut
Pro Hoarder
turbonut's Avatar
lots of thrust and thrust vectoring will fix it! then
Old Dec 04, 2010, 11:20 AM
aero1960 is offline
Find More Posts by aero1960
Registered User
I agree with you Air Head. I used to pylon race 180-195mph and flying a jet that way requires lot of distance and height. Having it close to you and doing tricks is much more fun. I added the second thruster and canards and can now fly 45 plus degrees or better slowly and recovers from rocking nicely. With a 5mph or better wind, I can toss the jet at 1/2 throttle and at 45 degrees can hover in front of me. The guys call it "The jet that goes nowhere". I am now working at doing a inverted harrier and then trying to do an high alpha inverted across the field.
If you want to duplicate mine, I will send you some pictures of my setup for the F-22.
Old Dec 07, 2010, 08:14 PM
Air Head is offline
Find More Posts by Air Head
Registered User

I will send you some pictures of my setup for the F-22


Why not post some here?

The F22 looks like it would be a good design for this sort of thing.
Old Dec 07, 2010, 08:49 PM
ApexAero is online now
Find More Posts by ApexAero
Aka: Tom Jenkins
ApexAero's Avatar
I have to throw in my thoughts on the purpose of strakes or lex from what I've learned at the field from some pratt and whitney guys, yes the privious picture shows the vortex created at high aoa but the creation was to keep a super critical airfoil controlable and flying at lower speeds. They stall the inboard first allowing the tips to fly. The best by product was to direct air into the intakes at high aoa. Its what I heard from the rocket scientist dudes is all I'm saying. I guess a vortex wash onto the top is a by product at higher aoa, vt tech came later.
Tom
Last edited by ApexAero; Dec 09, 2010 at 11:09 AM. Reason: picture added
Old Dec 08, 2010, 07:15 PM
aero1960 is offline
Find More Posts by aero1960
Registered User
Airhead:
If you would like to duplicate it including the thrusters, willing to share design.
Are you going to use bluecore foam?
Do you have a 64mm fan and motor?

As you can see, I modified a standard F-22 design(lower picture) added a 360 thrust vectoring gimbal, added my own design thruster that allows air from fan to exit out at end of wing to counteract torque so it lowers rocking of wing at high alphas,(now have it on both wings) and added canards.
Last edited by aero1960; Dec 08, 2010 at 07:22 PM.
Old Dec 08, 2010, 08:31 PM
Air Head is offline
Find More Posts by Air Head
Registered User

4500 Watt Fan Setup


Actually is a 4500 watt fan setup. Shooting for 13-14 pounds of thrust.

https://www.rcgroups.com/forums/show....php?t=1324088

Knife Liddle has put together a $100.00 setup that I am going to play with.

I saw a video of a turbine flying a 3D routine. I was not thinking to that extreme, but something that will fly a lot slower than the supersonic speedsters.

I may see if I can put together a vectored thrust nozzle for this.

aero 1960 - I like your wing tip thruster idea. Are you able to control the air or does it just bleed off the thrust tube?
Last edited by Air Head; Dec 09, 2010 at 02:04 PM.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Evolution Alpha engine not holding high throttle moisesh Fuel Plane Talk 7 Nov 22, 2010 07:32 PM
Cool Starfighter Super Jet High Alpha VIDEO littlephoenix Foamies (Scratchbuilt) 2 Nov 09, 2010 03:32 PM
Question High Alpha/Angle of attack aeronca52 3D Flying 23 Sep 16, 2010 09:46 PM
FSW vs delta for controlled high alpha ? vladn Modeling Science 4 Mar 09, 2005 09:09 PM
High alpha? davidleitch Sport Planes 2 Jun 11, 2003 09:44 PM