RunRyder RC
WATCH
 1 page 1265 views POST REPLY
HomeAircraftHelicopterThunder TigerOther › Kasama head.....Love it, but......
10-29-2006 02:28 AM  11 years agoPost 1
patriot21

rrKey Veteran

Byron,MN

My Posts: All  Forum  Topic

In normal mode i get a side to side wobble in the head... when i spool up to 1950 rpm it goes away....
any ideals.... i am using the same dampners i had in the old head...
sometimes it stays away even when i come back down to normal mode but then it sometimes comes back... any ideas...
My friends is doing the same thing

My Sponsor:VISA

PM  EMAIL  GALLERY  Attn:RR  Quote
10-29-2006 02:31 AM  11 years agoPost 2
HotsHabit

rrVeteran

Idaho

My Posts: All  Forum  Topic

If you are saying you reused your old dampers then I would install new dampers. And of course make sure to lube them well. I do not have a Kasama head but thats were I would start, along with checking the spindle shaft for straightness.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-29-2006 03:11 AM  11 years agoPost 3
EKIM

rrVeteran

Long Island New York

My Posts: All  Forum  Topic

Mine does the same thing. If I run my heli under 1850 I get the oscilation you are talking about. I used red dampers in my old head and I use them (new ones) in the kasama. I would imagine its doing this because the head is compressing the dampers slightly because of a tighter fit which in turn will tighten up your dampening. Tight dampening plus low head speed = oscilation. I cranked mine up to 1850 in normal and 2000 in idle up and haven't seen the shakes since.

*******Mike********

PM  EMAIL  GALLERY  Attn:RR  Quote
10-29-2006 03:39 AM  11 years agoPost 4
ez2bgman

rrElite Veteran

N'awlins, LA

My Posts: All  Forum  Topic

I have been using the same TT red dampners from my previous head since I got this several months ago. I have not experienced any wobbling at all. Make sure you thoroughly lube the dampners with di-electric grease or some equivelant.

Gary
Hot Girlz in da gallery

PM  EMAIL  GALLERY  Attn:RR  Quote
10-29-2006 09:41 AM  11 years agoPost 5
RC FlyingFlo

rrNovice

Germany

My Posts: All  Forum  Topic

Hi,

Also check for tight links above the swashplate. Make sure they are equally smooth. When you have also have straight spindles, lubed dampers, etc, you should´nt have any wobble.

I experienced a slight wobble when my head was new (running ~1750 RPM) but after about 6 Tanks it went away due to tight links loosening up.

Florian

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
10-29-2006 11:19 AM  11 years agoPost 6
Ben-T-Spindle

rrProfessor

Central Illinois

My Posts: All  Forum  Topic

The Kasama head is very stiff and the red dampers may be to stiff. With blue dampers it flies very well – since it has a very high cyclic rate you really don’t need the red ones.

I like the Infinavation dampers much better than the TT red dampers.


.

... BTS

PM  EMAIL  GALLERY  Attn:RR  Quote
10-30-2006 12:41 AM  11 years agoPost 7
TMoore

rrMaster

Cookeville, TN

My Posts: All  Forum  Topic

It's common to see oscillations when you tighten up the teeter spring action in the rotor head. The cure is just what you found. Run the headspeed up until the rubbers break in a little.

TM

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-30-2006 03:59 AM  11 years agoPost 8
mike lewis

rrApprentice

northeastern AZ

My Posts: All  Forum  Topic

1750 to slow so expect a wobble with Kasama?
1750 RPM gives me nearly all I kneed to do most maneuvers just not in close sequence, should I expect a Kasama head to have unstable hover or not the precision results I have heard about? I just think the previous post sounds like the Kasama head is not all it is said to be?

PM  EMAIL  GALLERY  Attn:RR  Quote
10-30-2006 04:19 AM  11 years agoPost 9
TMoore

rrMaster

Cookeville, TN

My Posts: All  Forum  Topic

It has absolutely nothing to do with the head. For one thing, any head that is tight won't hover at 1750 without the possibility of an oscillation ocurring. That's just the way it is. How can you read into this discussion that the head is unstable?

It's simple physics. If you run stiff teeter rubbers, stiff blades and a collective/cyclic system that is rigid the end result is that you are going to have a rigid rotor system. There has to be some flapping of the rotor blades and if the teeter system is stiff and you try to run low head speeds, an oscillation may result.

TM

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-30-2006 04:37 AM  11 years agoPost 10
helidad2

rrApprentice

potosi mo. usa

My Posts: All  Forum  Topic

this has been posted many many times . I fought it for 2 months and after a couple e-mail conversations with micheal prewitt from raptor technique mine was solved it was 100% the bearings in the grips if those bearing are the least bit notchy it will wobble 2 new grips and a new set of bearings fixed mine . it does not wobble at all now during spool up or otherwise . I have 2 raptors both were doing it and both were fixed with the same parts . I am now running kasama heads ,infination dampeners , and original plastic grips I have new kasama grips to install but have not had the time to install them.
just my 2 cents worth
good luck finding it
David

even a blind hog finds an acorn now and then

PM  EMAIL  GALLERY  Attn:RR  Quote
02-25-2007 03:40 PM  11 years agoPost 11
harmdive

rrApprentice

Colchester. UK

My Posts: All  Forum  Topic

Just to add. I upgraded the main rotor hub on my rappy 50 from the plastic one to the TT metal one because I was throwing it around. However I noticed after a while the metal hub was becoming loose on the main shaft and I could feel play on the head when picking it up. I've had some use out of the hub but I think it's design is flawed in that it relies on just one bolt to fix it to the heli. The Kasama head is a much better design in that there are three bolts fastening it to the head - one that goes through the main shaft and the other two to clamp it tightly. This design rocks and I have experienced no play in the head since I fitted it. Go buy one if you're doing 3D. They're about the same price as the TT one and Kasama's delivery speed is first class. I live in the UK and it got to me within 3 days and I didn't get stung on import duty or tax.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 1 page 1265 views POST REPLY
HomeAircraftHelicopterThunder TigerOther › Kasama head.....Love it, but......
 Print TOPIC  Make Suggestion 

 4  Topic Subscribe

Saturday, October 20 - 11:25 pm - 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