RunRyder RC
WATCH
 1 page 539 views POST REPLY
HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Hawk Pro - Tail servo - where does yours center?
10-17-2010 05:34 PM  8 years agoPost 1
ncostes

rrVeteran

Va, US

My Posts: All  Forum  Topic

We got all the clutch issues settled (must have been some loose material in there, taking it out a second time and taking the fan off and running it by hand a bit made it smooth out - thanks Phil) and finished the setup linkage/servo setup (thanks Steve for your excellent guide).

Got it outside and after range check and direction check on the gyro etc. fired it up.

Something's not right w/the tail, the rotor doesn't seem to be spinning fast enough to have any authority.

How many revs of the tail rotor should I see per 1 rev of the main rotor? When it starts spinning as I throttle up, I can give full rudder and it just slows it down a touch, doesn't counteract it - and the tail blades seem to slow down a lot.

The gyro is working in the correct direction, and i have the gyro extent set up so it almost binds but doesn't.

I didn't see Steve's tail rotor setup (it is a few posts down) until just now, so I set up the tail according to the Century manual with the tail slider in the middle of its throw.

I'll do steve's tail setup today but even if I had too much pitch on the tail, on a torque tube I wouldn't expect the tail blades to slow down?

PM  EMAIL  Attn:RR  Quote
10-17-2010 05:59 PM  8 years agoPost 2
oldfart

rrProfessor

Vancouver, Canada

My Posts: All  Forum  Topic

Also check that the tail gears are assembled on the proper shaft. The two gears are of two different sizes.

The bigger one goes on the input shaft and the smaller one goes on the output shaft. If they are reversed you will find the change in gear ratio will cause the tail rotor to spin much slower then it should.

You should get close to 5 turns (about 4 3/4 turns) of the tail rotor for each turn of the main rotor.

Also be sure the tail rotor is set up such that the tail blades are mounted in the proper direction, such that their leading edge turn up into the main rotor wash.

Phil

PM  EMAIL  GALLERY  Attn:RR  Quote
10-17-2010 06:50 PM  8 years agoPost 3
ncostes

rrVeteran

Va, US

My Posts: All  Forum  Topic

Thanks for the quick reply Phil.

Blades are in the right direction, but I'm only getting like 1:1 and its slipping so I guess once again the tail has come loose a little from the boom. It was tight when we first fired it up and the tail was acting almost normal but it seemed to deteriorate (we only burned like 5 minutes of fuel trying to adjust this).

I can't move it back and forth by hand but I guess it got loose.

Is there a better way to keep it in place other than friction/tightneing on the boom? I'm afraid to indent the tail boom by overtightening.

Hope to have time today to reassemble the tail and try again, but will probably have to wait till next weekend. We're almost there!

BTW the Hawk looks absolutely huge after flying the Novus CP 125/walkeara 4g6's and the Blade MSRs indoors

PM  EMAIL  Attn:RR  Quote
10-17-2010 07:35 PM  8 years agoPost 4
Gehrbox

rrApprentice

Charleston,SC

My Posts: All  Forum  Topic

When installing my boom it did not appear to insert far enough to engage the lugs molded into the main frame.

I pushed and wiggled harder and it slipped in the rest of the way. If you look in the opening of the frame forward of where the tail boom inserts you should be able to see the end of the boom engaged with the lugs fully with the molded lugs of the frame. It's is a very tight fit.

On another note I did my first loops today. Must have done a dozen of them.

PM  EMAIL  Attn:RR  Quote
10-18-2010 02:03 AM  8 years agoPost 5
ncostes

rrVeteran

Va, US

My Posts: All  Forum  Topic

When installing my boom it did not appear to insert far enough to engage the lugs molded into the main frame.

I pushed and wiggled harder and it slipped in the rest of the way. If you look in the opening of the frame forward of where the tail boom inserts you should be able to see the end of the boom engaged with the lugs fully with the molded lugs of the frame. It's is a very tight fit.
Gehrbox wins the tip of the day award for the "look for the boom from the top of the frame." It's hard to see, but definitely that helps! I was a little bit back. After moving the boom in till it was visibly pressed in, I got my 4.75:1 ratio back.

We reworked the tail linkage and adjusted the servo and gyro on the bench. Next weekend we should be good to go on the tail!

PM  EMAIL  Attn:RR  Quote
10-18-2010 02:13 AM  8 years agoPost 6
Gehrbox

rrApprentice

Charleston,SC

My Posts: All  Forum  Topic

Glad to hear it was a simple fix!

PM  EMAIL  Attn:RR  Quote
WATCH
 1 page 539 views POST REPLY
HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Hawk Pro - Tail servo - where does yours center?
 Print TOPIC  Make Suggestion 

 2  Topic Subscribe

Friday, December 14 - 10:04 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online