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Ace Hobby . Esprit Model . Thunder Power RC

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Main Discussion > Chinese weights on the tail grips
 
 
AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

Once the specifics have been determined, just cut heavy wall tubing to the appropriate length. Maybe small brake line tube ?


Or just slip some 4mm nuts over the 3mm bolt if that's close enough.
10-28-2007 Over year old.
HOMEPAGE  
 
 
Yug
rrProfessor
Location: UK. Herts

I started with thin-ish walled brass tube (3mm ID) but felt it needed more weight, so I'm using the QUK seesaw bushes. I think I need to get me a small lathe for christmas, I'm tired of bodging.

Vegetable rights and Peace
10-28-2007 Over year old.
 
 
AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

How close would a 4mm nut on the 3mm bolt on either side of the blade grip be ?

The weights and nut heights would be quite consistent.
10-28-2007 Over year old.
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Yug
rrProfessor
Location: UK. Herts

just tried it - way too much slop so it would be hard to get it well centred. Everything on the tail needs to be so well balanced in every respect.

One thing that occurred to me this evening is that this system of driving the mainshaft with an elect drill is a great way to check for smooth operation of the tail - just feel it with your fingers and any vibes will be immediately obvious. This also allows one to feel for vibes when some pitch is added. Last year I remember having bad problems with vibes resulting in the boom slipping It turned out to be axial vibes caused by non uniform thrust from the 2 tailblades. If I had used this approach, I could have saved several weeks of hunting.

Vegetable rights and Peace
10-28-2007 Over year old.
 
 
AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

I don't expect the 4mm nuts to be tight, they're just spacers.
10-28-2007 Over year old.
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Vertrep
Heliman
Location: Sutherland,UK

The balls simpley look a bit better, (I had used the Vario large ones.) I think if the weather stays this cr*p I may try and machine some nice tapered ones tomorrow, I will post any worthwhile results.
10-28-2007 Over year old.
 
 
Vertrep
Heliman
Location: Sutherland,UK

Missed the bit about the lathe for Christmas,get the best you can possibly afford, you will never look back.
10-28-2007 Over year old.
 
 
Yug
rrProfessor
Location: UK. Herts

I have bugger all space so it'll have to be a tiny one I can put away. Most of the lathe jobs I ever want to do are small bit's and pieces.

Vegetable rights and Peace
10-28-2007 Over year old.
 
 
AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

http://www.mini-lathe.com/Mini_lath...ns_other_7x.htm


The question remains, how far out with the weights ?
10-28-2007 Over year old.
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Yug
rrProfessor
Location: UK. Herts

I've had my eye on something like the Emco Unimat 4 Lathe. Do you know if it's a decent lathe ?

Vegetable rights and Peace
10-29-2007 Over year old.
 
 
AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

I have the Jet 9x20. Most all of them will do the job. We don't do anything too hard to beat up on them. You may have to go through it to check the alignment of all the parts when you first get it. My dial test indicator came in handy for that, let alone checking shafts.
10-29-2007 Over year old.
HOMEPAGE  
 
 
SkateFreak
Key Veteran
Location: Cambs UK/Luton

Yug,

If you get a lathe you just know i'll be hasslin you to make stuff and to let me come play all the time

-Jvr
10-29-2007 Over year old.
 
 
Yug
rrProfessor
Location: UK. Herts

I should warn you, if you step into my shed then you will suffer physical, mental, spiritual and eating disorders for many years

Vegetable rights and Peace
10-29-2007 Over year old.
 
 
ChristianM
Veteran
Location: Oslo, Norway

Quote 
Yug, in that first picture you show that has a "bullet" on the leading edge of the tail blade, that seems to be opposite of what you want. What's that about ?

I read about these TR blades a while back and the purpose of these "bullets" is not to reduce the servo load but to balance the blade such that it does not lead as much, i.e. to get the CoG on in-line with the blade bolt hole. Don't know if it makes much difference or if it is a PR gimmick.

Christian

Burn fuel, be happy
10-29-2007 Over year old.
 
 
bobkins
Senior Heliman
Location: Bocholt, Belgium

Hi,

If Chinese weights have a good effect on the tail, woudn't it have a even better effect on the main rotorhead? Or is this not needed because of the paddles?


Greets Rob

Hirobo Shuttle Plus , Trex SE V2
10-29-2007 Over year old.
HOMEPAGE  
 
 
Yug
rrProfessor
Location: UK. Herts

Quote 
If Chinese weights have a good effect on the tail, woudn't it have a even better effect on the main rotorhead? Or is this not needed because of the paddles?
That same question has been rattling round my head. I might experiment on a 450 behind a foo shield and manually move the swash up and down to feel what forces are present when spooled up. Trouble is that mine's eCCPM so i'll have to make up some long linkages to get safe access. I don't want my fingers anywhere near that thing if it's feeling disagreeable

Vegetable rights and Peace
10-29-2007 Over year old.
 
 
SkateFreak
Key Veteran
Location: Cambs UK/Luton

Ahhh yug...
you gotta let me come round and watch that
I'll film it for all you chaps on rr

-Jvr
10-29-2007 Over year old.
 
 
JKos
Elite Veteran
Location: City of California in the state of Maryland

> might experiment on a 450 behind a foo shield and manually move the
> swash up and down to feel what forces are present when spooled up.

May I suggest measuring the current draw of the swash servos instead? When you get the lowest current draw, you have found the sweet spot for your weighting effort. This can be done in a few ways. You could, for example, record the data and analyze after a test run with something like a MicroPower eLogger. This would also allow you to actually fly the heli and get some real, in-flight data.

- John

MSH Protos
10-29-2007 Over year old.
 
 
AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

With all that noise on the power lines (servo motors going on&off all the time) you will be much better off with an analog meter.
10-29-2007 Over year old.
HOMEPAGE  
 
 
ChristianM
Veteran
Location: Oslo, Norway

Yes you have to deal with the transients and noise in the data but you could deal with that by taking an average over for example 10-15 seconds while doing a basic pitch pumping maneuvers. You have to make the maneuver fairly repeatable so that you can compare the results.

One word of caution: don't add to much weight as the blades will become unstable which could result in a number of undesirable results.

Christian

Burn fuel, be happy
10-29-2007 Over year old.
 
 
11 pages [ <<    <     1      2     ( 3 )     4      5     NEXT    >> ]8413 viewsPOST REPLY
Mikado Modellhubschrauber . GrandRC . CanoMod

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Main Discussion > Chinese weights on the tail grips
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