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Scorpion Power Scorpion Power
HelicopterGasser Model RC HelicoptersOther › Chinese weight mod on gassers
12-12-2008 05:15 PM  8 years agoPost 1
j.8

rrVeteran

Denmark

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Hi All

I have been reading about this "Chinese weight mod"

Have any of you got, experience with that mod on
gassers, or 90 size nitro.

Video link to some testing and results
with the weights on a Trex 500

http://www.youtube.com/watch?v=iiW7McBiN5s
http://www.youtube.com/watch?v=XWkQGFaArzg

Any imput will be apriciated

Regards Bo

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12-12-2008 05:21 PM  8 years agoPost 2
smallplanes

rrElite Veteran

S.C. ,SSA

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Why would you want to do that?

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12-12-2008 05:24 PM  8 years agoPost 3
Notar2

rrNovice

USA

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The Minicopter Joker line has been doing this for some time.
According to test results, it takes a lot less power from the servo to make a pitch change with the "proper" amount of weight in this location, therefore making your tail servo work less, and tail rotor response faster.
Joe

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12-13-2008 12:54 AM  8 years agoPost 4
jschenck

rrProfessor

La Vista, NE.

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I think it was Yug that documented his efforts to try and find the right weight. He took the head off and attached a cordless highspeed drill to the mainshaft. Then disconnect the tail control from the servo, spin up the tail to speed and move the tail control rod with your fingers. You can feel the effort get substantially easier when you get the weight about right.
Why would you want to do that?
Counterweights the tail to make it easier to move. Easier to move makes the tail servo work less and that would make it more accurate, possibly allowing a higher gain without overworking the servo. There is a lot of info about this on rr from about a year ago, some searches will find the threads

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12-13-2008 11:42 AM  8 years agoPost 5
j.8

rrVeteran

Denmark

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Hi jschenck

I have searched RR and found that it`s most
common on Trex450 sized helis, I can`t find
any 90 sized instalations.

The benefits are like you say, and that`s
is very nice, only down side that I can
imagien is the extra overall weight, that
put more stress to the baerings.

But I will make some sort of a tailrotor
setup device, and start testing.

Regards Bo

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12-13-2008 12:07 PM  8 years agoPost 6
jschenck

rrProfessor

La Vista, NE.

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I don't know but my guess is the size and weight of the tail blades have a lot more pull on the bearings and with the reduced side load by counter-weighting the grips your bearings will have reduced wear and tear. Yug's gallery has a picture of the drill test I was talking about. here it is:

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12-13-2008 12:45 PM  8 years agoPost 7
j.8

rrVeteran

Denmark

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Hi

"I don't know but my guess is the size and weight of the tail blades have a lot more pull on the bearings and with the reduced side load by counter-weighting the grips your bearings will have reduced wear and tear"

Perhaps yes

Thanks for the photo of Yug`s setup, I have some
bend tailbooms, I`ll try and make a set up
with only a, drill/dremel, piece of tailboom/shaft and the tailrotor,
some sort of a permanent divice

I like Yug`s idear of testing with out the rotorhead

Hi notar
"The Minicopter Joker line has been doing this for some time."

yes I have seen that, allready integraded very nice

Regards Bo

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12-13-2008 01:27 PM  8 years agoPost 8
brokenheli

rrApprentice

gettysburg Pa.

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It's done on full size heli's too. of coarse it's more for balance. Kevin

never stop learning

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12-13-2008 05:59 PM  8 years agoPost 9
Paul-PJH

rrApprentice

The Netherlands

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Hi Bo,

I believe also the Henseleit NT and MP have this feature.

Grtz. Paul

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12-15-2008 12:34 AM  8 years agoPost 10
bosshoss

rrVeteran

Chicago, IL

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Blows my mind that .5g difference makes THAT much of a force reduction.

Why Hover a Yak, when a Heli does it better?

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12-15-2008 01:04 AM  8 years agoPost 11
AllThumbs

rrVeteran

New Zealand

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Blows my mind that .5g difference makes THAT much of a force reduction
Amazing thing all that centrifugal force stuff!!

I didn't believe it till I took the main blades off my Mini T, disconnected the tail rod from the servo & tried to change the pitch when in idle up by hand.. Takes a LOT of force to operate the tail.. enough to stall some servo's. One would have to assume that the larger the heli, the more force required..

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12-15-2008 06:22 AM  8 years agoPost 12
Forced_Inductio

rrApprentice

Camrose, AB

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I tried this on my trex 450 back when i had it. i couldnt believe how much force it took even without the tail blades on. I didnt think that it would be a problem on larger helis as well, i just thought that was align quality (or lack there of).

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12-23-2008 03:05 PM  8 years agoPost 13
j.8

rrVeteran

Denmark

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Today I tried out some weigths on my Spectra

I setup the heli using same methode as Yug,
thanks for posting the picture jschenck.

Theise weigths are only mactched, without the
blades, and I can say that with no blades
and no weigths it take some/alot force to
move the tail pitch ( I have no force gauge )
this is only done with the "finger force gauge"
And with the weigths on it takes no/little power
to move.

The reason I did the test without the blades,
I think that since the heli is "tied down"
the trust that the tail rotor produces and
the wind resistance of the blades will make
the tail pitch go to center 0 deg. anyway

Overall is it worth it, I cant say, but the
tests made by Heli heim( from the videos)
wiht the force gauge and the amp meter,
seemes to prove it.

If anybody make there own experince or have
any idears, with this, pleace post.

Regards Bo

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12-24-2008 04:19 AM  8 years agoPost 14
jfint

rrApprentice

Simi Valley, CA

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I think its g-force that mkes a set of grips the the trex 600 nitro that the guys at my field are loving on their 700's

Changed this cause originally I wrote blades and I meant grips
http://www.rchover.com/inc/sdetail/116063

there is a link

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12-24-2008 05:52 AM  8 years agoPost 15
Forced_Inductio

rrApprentice

Camrose, AB

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Its not the blades that are causing this, its the centrifugal forces acting on the grips themselves. for some reason, even when you take the blades off and spin up the taiwithout hte head on and try to manually move the tail pshrod, it takes alot of force to do it. Helifreak had a HUGE thread going on about this on the 450s a while back. someone called it centrifugal returning momentum. I think.

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12-24-2008 06:39 AM  8 years agoPost 16
artimus

rrKey Veteran

Buckley WA

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It called the tennis Racket effect....Is has to do with the blades wanting to always center themselves ...kinda a gyro effect. When the balls are on and the grips are off center the balls are still in plane withe blades and reduces the gyro effect on the blades......so its takes less force to change pitch on the tail.

Heres a linkthat show more....
http://www.youtube.com/watch?v=bkEX1QOLGjQ

Fly Hard......Team Viagra

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12-24-2008 03:01 PM  8 years agoPost 17
rbort

rrProfessor

Franklin, MA - USA

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j8

Would be interesting to know if you find any performance difference on your spectra with the weight mod that you did. You might be able to "flight test" it by using a watt meter in the power circuit to see how many amps it draws in flight with and without the mod while doing some pirouettes.

Let us know! I'm checking out soon and offline for the day.

-=>Raja.

MA 1005 Hanson 280, 4129 flts
Spectra 27 3DMax, 3187 flts
Whiplash V1 Hanson 300, 1425 flts
Whiplash V2 Hanson 300, 185 flts

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12-24-2008 03:12 PM  8 years agoPost 18
j.8

rrVeteran

Denmark

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Hi Raja

Well I can make a amp test on ground as things are now,
I will look in to that within the next few days,

An in fligth test, then I will have to see if anybody
at the feild have a watt meter that I can borrow.

If there is any difference in preformance overall ?
But I think it will make the tail servo live a less
streesful life.

I agree that in fligth tests are the best proofe,
and I have`nt seen any of them in this "boss weigth mod"
Regards Bo

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12-25-2008 07:53 PM  8 years agoPost 19
Forced_Inductio

rrApprentice

Camrose, AB

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Artimus,

The effect that others were trying to counteract were soley on the grips. with the tail blades removed there is still a significant amount of force needed to change the pitch of the blade grips. one wouldnt think so, but try it of you have a 450. Its surprising.

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12-26-2008 07:31 PM  8 years agoPost 20
artimus

rrKey Veteran

Buckley WA

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That right, but the forces on just the grips means nothing with out the blades on unless you are flying with out tail blades......I tried it just doent work very well...anyway the point being that it another story with blades on it.....
it how much force it take to stay where you put it with out wanting to re center its self.

Fly Hard......Team Viagra

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