RunRyder RC
 3  Topic Subscribe
WATCH
 1 page 597 views
Scorpion Power Scorpion Power
HelicopterThunder TigerOther › Losing headspeed on cyclic input
10-09-2005 10:53 PM  12 years agoPost 1
venturousviking

rrNovice

Clarksville,​Tennessee

My Posts: All  Forum  Topic

Hi....Just rebuilt my Rap50 after a small boomstrike while practicing nose in landings. Today as I was flying everytime I would give some cyclic on loops or rolls I would lose alot of headspeed...It was enough of a loss to make the heli drop until it picked back up. Obviously something is wrong because it didn't do this before. I use raptor technique to set up my helis. I thought it was the engine being too rich but I have it leaned as far as it will go without dying so that is not it. When I rebuilt I decided to add a JRDS811 on the collective and a Hitec 525 on the throttle. Everything else except the tail is 94322 Airtronics. Even though I didn't have to for this rebuild I went ahead and reset all of the servos and put new arms on them and "tightened up" my mechanical setup a little bit. So I'm guessing that the cyclic servos are giving too much cyclic. How do I measure this. I normally just set them to go as far as it mechanically can before it binds and leave it. My collective pitch range is 10 and 10. Any ideas? BTW..my engine is an OS 50..

Thanks...

Mike

PM  EMAIL  Attn:RR  Quote
10-09-2005 11:09 PM  12 years agoPost 2
Mike Wilson

rrVeteran

Toronto, Canada

My Posts: All  Forum  Topic

If you are setting them up with maximum mechanical throws, you probably have too much cyclic pitch. You should only need about 7 deg of cyclic pitch and this has to be measured at 0 deg collective.

To measure the elevator pitch make sure the collective it as 0 and then turn the blades perpendicular to the helicopter. Make sure the flybar is level and then move the stick to full up elevator and down elevator, measuring the pitch on both. This can be tricky to do at first but you will get the hang of it. If the pitch is more than 7 deg, reduce the ATV on the elevator until it reads 7 deg. For the aileron, you will want the blades parallel with the helicopter and measure in the same fashion.

Some fly with a lot more than 7 deg of cyclic pitch but it is far more difficult to not bog the engine.

.....led

Teambob00

PM  EMAIL  GALLERY  Attn:RR  Quote
10-10-2005 12:00 AM  12 years agoPost 3
BarracudaHockey

rrMaster

Jacksonville FL

My Posts: All  Forum  Topic

You can also try some swash plate to throttle mixing.

Andy
AMA 77227
http://www.jaxrc.com

PM  EMAIL  GALLERY  Attn:RR  Quote
10-11-2005 02:13 AM  12 years agoPost 4
venturousviking

rrNovice

Clarksville,​Tennessee

My Posts: All  Forum  Topic

Thanks Led....got the cyclic pitch all set now...It really wasn't that far off so I began to look at the heli while I was throwing around the controls then I saw it....My throttle mixing (Thanks Cuda).....I just happened to notice that when I set it up I must have accidentally DECREASE throttle on my right cyclic and up elevator....These just happen to be the controls I use most when flipping and rolling.....

Thanks for the help..

Mike

PM  EMAIL  Attn:RR  Quote
10-11-2005 12:42 PM  12 years agoPost 5
BarracudaHockey

rrMaster

Jacksonville FL

My Posts: All  Forum  Topic

I did the same thing but the 9C has a servo menu with bar graphs where you can watch the results of mixing as you move the sticks so I got it sorted before I flew it. Someone was nagging me about changing the channel from football to sponge bob while I was programming it so I wasnt paying careful attention.

Andy
AMA 77227
http://www.jaxrc.com

PM  EMAIL  GALLERY  Attn:RR  Quote
10-11-2005 02:08 PM  12 years agoPost 6
Mike Wilson

rrVeteran

Toronto, Canada

My Posts: All  Forum  Topic

No problem Mike,

I'm glad you were able to find the issues and learn something new in the process .

Get yourself a Throttle Jockey governor and forget about that mixing stuff .

....led

Teambob00

PM  EMAIL  GALLERY  Attn:RR  Quote
10-11-2005 03:10 PM  12 years agoPost 7
venturousviking

rrNovice

Clarksville,​Tennessee

My Posts: All  Forum  Topic

yeah...i'm sure...but thanks anyway....I found it my mixing was a little whacked which was causing the throttle to close on cyclic inputs..

Mike

PM  EMAIL  Attn:RR  Quote
WATCH
 1 page 597 views
Scorpion Power Scorpion Power
HelicopterThunder TigerOther › Losing headspeed on cyclic input
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Friday, November 24 - 6:35 pm - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online