RunRyder RC
 11  Topic Subscribe
WATCH
 2 pages [ <<    <     1     ( 2 )    >    >> ] 1298 views
Scorpion Power Scorpion Power
HelicopterMain Discussion › Wind, and the beginner...
03-18-2009 01:25 PM  8 years agoPost 21
chris6414

rrApprentice

Sneads Ferry, NC USA

My Posts: All  Forum  Topic

Upwind transistion

This is the most difficult area in a circuit in wind above 10 and gusty. My Hawk is fast in the down wind and the turn should not be a hard bank until you are used to it. The wind will push you down and downwind in the turn and if your not careful, stop the helo altogether. Just like with a plane you need power in the turn. Downwind, it is intinct to lower the collective while you "ride the wind" but if you don' get on the collective/power in the turn, it could get hairy if a gust grabs the disc while banked. I fly in a modded normal mode in Idle 1 and only fly in rate mode. Meaning I have 5 degrees at normal and idle 1 at half stick with some throttle all the way down to -5 collective at the bottom. This way when I chop the collective I have the same HS that I do at hover to keep solid control during the approach. In rate mode in wind, the tail will self recover as long as the helo is moving. I have been disoriented with a HH gyro before aways out, and had difficulty locating the tail when I pulled some power to try and get my bearings back and found the tail was not where I though it was. In rate mode the adding power and flying forward allows the tail to naturally fall in behind which can give a few extra seconds to recover as the helo is now in it's natural FF attitude. Just my experience.

Century Hawk Sport, OS .32, Futaba 7C, GY-601 9251
Predator Gasser SE G-23, Fut 3010 servos, JR gyro/servo

PM  EMAIL  GALLERY  Attn:RR  Quote
03-18-2009 05:19 PM  8 years agoPost 22
Phoenix_8

rrApprentice

USA

My Posts: All  Forum  Topic

12 and under

I learned to hover and FF with 12 and under wind gusts. We fly out in the flatlands of TN at an old WWII airfield and wind is a constant variable that we have to learn to fly with.

I agree, turn the wind speed up on the sim and change azimuths as well. Practice, practice.

Good luck and happy flying.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-18-2009 08:08 PM  8 years agoPost 23
Briliu

rrApprentice

Rome, NY

My Posts: All  Forum  Topic

Here's a little more explination on the vortex ring state. Its more theoretical than anything but I found it wicked cool

He continues on the next page with:

"For the pilot trying to fly under these conditions, the vortex-ring state produces some interesting effects, which we'll get into a little later.
Turning the fan up full blast so that the flow is greater than the rotor-induced velocity makes the net flow upward through the rotor. The rotor is now slowing the tunnel flow a little and is actually extracting energy from the passing wind, Naturally this condition is known as the windmill-brake state."

Windmill-brake state is what happens during autorotation. :P

He also goes on to explain a bit more about the vortex ring creating a bubble of circulating air. It doesn't stall the rotor, it's just sucking its own downwash into the rotor, so the incoming air has a velocity, and the rotor has to do more work to keep the same amount of thrust. The bubble can burst also usually on one side first, then the next, causing the rotor to behave erratically and flap and feather, causing tilting and other weirdness.

You can actually SEE a vortex ring state with the smoke from your exhaust as your descending slowly o a zero wind day. It's pretty cool, it builds up more and more and more smoke circling through the rotor, out, up, and back down through till you have to add collective or risk hitting the ground! :P

Neat huh? It's a spectacular book, whether or not you have a background in aerodynamics (I do).

(Source: Title: Rotor & Wing International, Helicopter Aerodynamics Author: R. W. Prouty Publisher: Phillips Publishing 1985)

Just thought I'd chime in with a bit of theory :P

PM  EMAIL  GALLERY  Attn:RR  Quote
03-20-2009 12:27 AM  8 years agoPost 24
predatorman

rrVeteran

Falkland Islands

My Posts: All  Forum  Topic

TrickFrog...'Built up areas' I mean gardens and such like where you might have a fairly small garden to fly in...with a strong breeze you will get turbulant conditions which make for interesting flying

Was out the other evening with my Gasser, had some strong winds with some heavy gusts...my Heli was getting thrown around the skies a fair bit...felt like flying my Trex 450 in a heavy breeze.

Quality takes........time!

PM  EMAIL  Attn:RR  Quote
WATCH
 2 pages [ <<    <     1     ( 2 )    >    >> ] 1298 views
Scorpion Power Scorpion Power
HelicopterMain Discussion › Wind, and the beginner...
 Print TOPIC  Make Suggestion 

 11  Topic Subscribe

Thursday, November 23 - 11:27 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online