MARCMAF -> My latest project!

My latest project!, Gyrocopter!

Track this topic | Email this topic | Print this topic

alvinonline

Posted: May 28 2012, 09:37 PM

Administrator
Group Icon

Group: Admin
Posts: 5,040
Member No.: 1
Joined: 12-May 04

QUOTE (Johnny_J @ May 28 2012, 09:51 PM)

I've looked at Gyrocopter sites and the concept of how the blades work sounds easy but I can't figure out why my blades want to turn backwards??

Hi Johnny,

From looking at the pictures of your Gyrocopter machine, it looks like you have positive pitch set up in the fixed pitch main blades.

If that is the case:

That is why the blades and head are turning backwards.
Since a gyrocopter is always in a state of autorotation because the head is not powered and depends on the air moving in from under the rotor disk to keep them rotating and will also provide lift.
Gyrocopters are always flown with positive angle of attack regarding the main rotor disk, so that the air comes into bottom of rotor disk as the electric motor driven tractor prop in this case pulls the gyrocopter forward through the air.

Readjust your main rotor blades to about two degrees negative pitch and give that a try.

If you have not already, you might need to think about airplane type rudder and elevator for yaw and pitch control. Some gyrocopters have the head setup so it can be tilted forward and back for pitch control, but that does not look possible on your machine and you could do the same with airplane type horizontal stab and elevator.

It is all a bit of magic to me, I have seen RC gyrocopters tried in the past, with mixed results.
Will be a learning experience for sure and good luck with your project.

Please take a look at the website linked to below.
It has lots of info, pictures, and videos about building RC Gyrocopters.

RC Gyrocopter Site - Click Here

Also there is a section on the RunRyder RC Helicopter Forum dealing with Gyrocopters. You might find some useful info there.

RunRyder Gyrocopter Forum - Click Here

And there is an extensive RC Auto Gyro forum at RC Groups.

RC Groups Auto Gyro Forum - Click Here

--------------------

Alvin Reed™ - MARCMAF Admin

jonkoppisch	Posted: May 29 2012, 05:16 AM
Jets, Electrics, & Forum Follies Moderator Group: Mods. Posts: 2,904 Member No.: 3 Joined: 12-May 04	Alvin's got it -------------------- Always remember the compliments you receive and never the rude ones.

CRASH 22

Posted: May 29 2012, 06:12 AM

Forum Key Veteran

Group: Members
Posts: 2,293
Member No.: 371
Joined: 30-April 07

QUOTE (alvinonline @ May 28 2012, 09:37 PM)

Will be a learning experience for sure and good luck with your project.

Good Luck, Let us know when the maiden flight will be.

--------------------

An armed socitey is a polite society!
TWIN ENGINE-"Fastest way to the Crash site."
"Lots of love, no respect." - COMBAT
"If you haven't crashed...your not flying hard enough."
ACMA'S... S.P.A.D. Master
"No matter how many planes I plant, They just won't Grow. "
SPADMAD "To go where no spadder has gone before"
"Tearing $hit up since 1985"
Go ahead and Crash it,......It's only plastic !!!!!
Flying low and inverted, DOWN is up & UP is BAD!!
"Friends don't let friends fight alone"- R C Combat
ILUVCOMBAT

Flying Dutchman	Posted: May 29 2012, 01:09 PM
A Mac Man Group: Members Posts: 5,044 Member No.: 60 Joined: 17-October 04	Yep, Johnny and I talked about that pitch yesterday, but I was not positive that the pitch was wrong... I went to a couple of full-scale gyrocopter websites and they said that the blades will not spin the way you think, and they will definitely not spin properly if the pitch is not correctly set. Here's Johnny and his counterrotating, still earth-bound gyrocopter... The thing looks really good, and it has elevator and rudder surfaces, as you can see here. This post has been edited by Flying Dutchman on May 29 2012, 01:10 PM -------------------- Frits - AMA Member 403246 (since 1990) Azalea City Model Aeronautics club Secretary, News Editor, Membership Chairman and Flight Instructor ACMA "From the Pits" Field Reporter > http://www.acma-rc.com/pits.html ACMA reputable Test Pilot (I will fly anything standard, unique, weird or odd...) Multi-engine certified (I flew Robert's history-making TRIPLE BEAST!) Proud member of BOSS, the elite Balls Of Steel Society - "Ballderdash"

Johnny_J	Posted: May 29 2012, 08:19 PM
Gliders/Sailplanes Moderator Group: Mods. Posts: 1,096 Member No.: 325 Joined: 29-January 07	Thanks Alvin! Looks like I need to redrill the holes again! -------------------- Johnny_J BOSS Member "CURVED BALLS" My Website

Johnny_J	Posted: Jun 1 2012, 06:28 PM
Gliders/Sailplanes Moderator Group: Mods. Posts: 1,096 Member No.: 325 Joined: 29-January 07	Made some adjustments and they are now going in the right direction! Thanks Alvin! Maybe I'll get to give it a trial run tomorrow! -------------------- Johnny_J BOSS Member "CURVED BALLS" My Website

Johnny_J	Posted: Jun 2 2012, 09:50 PM
Gliders/Sailplanes Moderator Group: Mods. Posts: 1,096 Member No.: 325 Joined: 29-January 07	OK! The blades are spinning in the proper direction! Now they wont generate the lift or spin up fast enough to leave the ground good! Gonna modify the blades to make the airfoil thicker and have more surface area in order to produce more lift! Hope it works! -------------------- Johnny_J BOSS Member "CURVED BALLS" My Website

0 User(s) are reading this topic (0 Guests and 0 Anonymous Users)

0 Members:

« Next Oldest | RC Electrics | Next Newest »

DealsFor.me - The best sales, coupons, and discounts for you