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e-Hirobo SRB Quark - Lepton - XRB Coaxial > Chinese Weights on a Lepton?? Is it Possible??
 
 
Tmblewd
Veteran
Location: Phoenix, AZ

Has anyone been reading this thread about the weights on the tail rotor of a TRex?

http://runryder.com/helicopter/t383057p1/

I wonder if the same weight would work on the Lepton?
01-21-2008 03:52 AM
 
 
Jafa
Elite Veteran
Location: Sydney, Australia

It works on any heli


Lepton | TRex600Nitro | Sceadu | Freya | Avant | Predator Carbon Max
01-21-2008 04:01 AM
 
 
Tmblewd
Veteran
Location: Phoenix, AZ

Well, I know it works but from what I've read it also depends on how much weight you put on it. So, has anyone with a Lepton tried it yet?
01-21-2008 04:41 AM
 
 
demosa
Veteran
Location: Tigard, Oregon, U.S.A.

I'm planning to experiment with this but haven't done it yet.

I'll start by putting some Hirobo balls with standoff on both sides of the tail blade holder. I'll use a longer 2mm threaded rod with lock nuts on both sides (rather than a regular 2mm bolt).

Of course before I do all this I want to "feel" the problem on the bench firsthand.
01-21-2008 06:10 PM
 
 
Tail_BoomStrike
Veteran
Location: Virginia Beach




02-11-2008 04:38 PM
 
 
Tail_BoomStrike
Veteran
Location: Virginia Beach

Chinese weight is a sucess in Lepton...... Finaly,.....

Using only 401, and 9650 modded with 9257 gearset @6V. The tail is pretty solid..... Not to mention with HS of only 2650rpm..... Also, one note, this is tested on an 400mm MAH blades.....

I have to mention, the extra weights showing on the picture, near the tail hub, is a must, when doing this mod...... It cancels the effect of the offset on the tail grip pitch arm.... If you didn't add this weight, the pressure needed when the tail blades has to bite for counter clockwise piro will double, maybe even more, than without chinese weights...

Here's the vids.....

02-15-2008 05:05 PM
 
 
Fernando
Senior Heliman
Location: Madrid

Hi Tailboomstrike,

pls, give us more info, 4s or 5s, what`pinion size??

Thanks
02-16-2008 07:32 PM
 
 
Tail_BoomStrike
Veteran
Location: Virginia Beach

4S Evo20 3700mah
Align 17T pinion (you gonna need mini file set for the center frame, for the pinion to reach the main gear)

Make your own carbon fiber tail control push rod the stock wire rod is too flimsy. Chinese weight mod is very sensitive to slight bending of the rod no matter what model you work on.

Anyway an update...... I increased my HS today to 2700rpm..... There's an intermittent flutter on the tail...... That simply means with greater tail rotor speed, it's reactive.... My gain is already down to 41% on that test flight..... 401 is no good below 40%..... So, the alternate remedy is to move the ball one hole inward on the servo arm, shorter tail blades is also a good option..... That QJ8 tail blade on the test flight is 65mm from center of mounting hole to tip...... I could trim it down a bit..... But I'm gonna move the ball on the servo arm first...... That might be all it needs..... My tai drive belt BTW was also old and been to different crashes..... so it could also be the belt thats causing it...... The belt is skipping the teeth on the pulley.......

I'll post another video..... I'm still dialing it in..... I actually re-leveled my swash plate this morning, cause I didn't like the way it flew on the test flight video....... I used the helidirect swash tool before and there's too much clearance in the hole for the main shaft, so it wasn't accurate when I used it the first time. But this second time around, I resolved it by inserting printer paper resized to the I.D. of the leveling tool.... I was amazed how too far out of level the swash plate was...... So the swash is perfectly level now..... And recalibrated my pitch and cyclic travels...... +/- 11*, and 7* for cyclic...... I did a test flight this afternoon.... Man, the cyclic was too damn fast for my taste, I can't belive it's only 7*, I have to dial a 95% D/R on the radio..... I was just now able to appreciate what a fine flying machine this Lepton is. First time I was able to perform 4 point tic tocs in one spot (or maybe it was the wind that's keeping it in there ), not to mention two complete rotation..... Although I could piro flip better on my 450 and 600N ..... But that's just because I'm still getting used to it..... I haven't flown this Leppy since last summer......
02-17-2008 12:23 AM
 
 
Tail_BoomStrike
Veteran
Location: Virginia Beach

Fluttering solved.... I just have to move the ball on the tail control arm to the outermost hole...... Tail is rock solid again, at 2700rpm HS.....
02-17-2008 10:39 PM
 
 
demosa
Veteran
Location: Tigard, Oregon, U.S.A.

Tail_BoomStrike,
I don't understand your point about the weight closest to the hub.
Couldn't you put equal amounts of weight on *both* sides of the blade bolt instread ?

Thanks
02-19-2008 05:25 PM
 
 
Tail_BoomStrike
Veteran
Location: Virginia Beach




The picture above should be enought explanation......

As for your other question...... Yes you could...... It's just a matter of choice, it will have the same effect as long as the chinese weights are 90* to the blades..... On mine however, I biased the weight a little bit, to distribute the load on the bearing..... If you read on the link below, Heli_Headcase did an explanation about it.....


http://www.runryder.com/helicopter/t388772p1/
02-19-2008 06:20 PM
 
 
Tail_BoomStrike
Veteran
Location: Virginia Beach

DOH

I just realised what you're saying demosa....

Quote 
I don't understand your point about the weight closest to the hub.


But, I'm not gonna explain any further the priciple behind it..... But rather, I will ask you to do this experiment......

Put whatever amount of weight on both sides of the bolt you desire. Now spool up (with the main blades removed, Of course). Now play with the tail control rod...... Feel the difference in the amount of pressure required when pulling and pushing the rod..... You will feel that pushing requires more pressure than pulling..... What causes it???? As I mentioned earlier..... The offset on the pitch arm...... The weights I added, the ones I pin pointed on the picture above, opposite the pitch arm, serves only to counter the effect of the offset of the pitch arm, and not to reduce the tendency of the blades to flatten...... So the pressure required to change the blade angle in both direction would be even, once you added the chinese weights......
02-20-2008 04:03 AM
 
 
demosa
Veteran
Location: Tigard, Oregon, U.S.A.

This is what I did :



works great !

Tail_BoomStrike, you are right, the pressure is different between pushing and pulling but I found that the overall improvement is huge and the little difference in pressure is not really worrying me; my tail servo got a huge help because of this !

03-06-2008 06:59 PM
 
 
Fernando
Senior Heliman
Location: Madrid

Is this thing same as chinese balls?
03-07-2008 09:01 AM
 
 
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e-Hirobo SRB Quark - Lepton - XRB Coaxial > Chinese Weights on a Lepton?? Is it Possible??
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