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HomeAircraftHelicopterJR Heli Vibe 90/50, Sylphide 90, GSR260 › Vibe 90 SG - C.O.G.
01-11-2010 10:33 AM  8 years agoPost 1
G Steyn

rrApprentice

Heidelberg, Transvaal, Suid Afrika

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I've been setting up a Vibe 90 SG for F3C flying. I had to add quite a bit of mass to the nose to get the heli standing 100% still in a hover.

When the heli is hung by its flybar, the heli needs to be very nose heavy (on the bench) before it would hover without any fore/aft trim.

At this point I'm thinking of trading the canopy for a Sylphide canopy, so less mass would have more of an effect in the longer nose.

Items in the nose currently:
Align Regulator
2s 2500mah Li-po
Extra servo to control mixture
ATG,
Solid G
a Crap load of Lead.......

Have any of the members experienced a similar tendancy?

Greetings

Concentrate on your weaknesses and your strengths will reward you!

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01-11-2010 10:44 AM  8 years agoPost 2
Gorgin4325

rrKey Veteran

Florida

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Hi,

I know it depends on what electronics you use, but I actually found both my Vibe SGs to be tail heavy. So I made some mods and replaced some parts to make the tail lighter. There are lots of pictures in my gallery.

One thing I did notice was that the Insane Canopy that I got feels a lot lighter than the stock one that I had painted locally.

You can also adjust the front battery tray and push it back a bit if that helps...

If you want to make it tail heavy, you could also try to get some metal ends for the boom supports.

You could also try to use a micro servo for throttle. I've been running JR 287MGs in all my nitro helis for over a year now and I'm very happy with them. That knocks off a lot of weight up front.

Let us know how it works out.

Regards,
G

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01-11-2010 11:18 AM  8 years agoPost 3
G Steyn

rrApprentice

Heidelberg, Transvaal, Suid Afrika

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Thanks mate. I'll browse through the photos.

The heli is tail-heavy, so I need mass in the front.

Greetings

Concentrate on your weaknesses and your strengths will reward you!

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01-11-2010 11:43 AM  8 years agoPost 4
G Steyn

rrApprentice

Heidelberg, Transvaal, Suid Afrika

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What I'm trying to say is:

I've set the swashplate to be 17mm from the bottom as per the manual.

I've aligned the swashplate 100% parallel with the tailboom, since I don't have a swash leveling tool for the Vibe (only one with bubble levels).

I've adusted the heli to be slightly nose heavy on the bench.

NOW....

When I hover the heli I need a lot of forward trim to get the heli standing perfectly still. It seems strange to me.

Greetings

Concentrate on your weaknesses and your strengths will reward you!

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01-11-2010 11:49 AM  8 years agoPost 5
mdu6

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Montreal

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Double check your paddle alignment

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01-11-2010 12:25 PM  8 years agoPost 6
Gorgin4325

rrKey Veteran

Florida

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Sorry I got the whole thing wrong

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01-11-2010 04:25 PM  8 years agoPost 7
BlueGarry1

rrKey Veteran

Romford, Essex, UK

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I used a 3600mah Li-Po pack with a couple of steel washers underneath, and a full size servo (DS8231) for the throttle. I also replaced the stock boom supports with a Carbon pair from Quick UK.

My SG now balances just fine.

Hope this helps

Garry

Rave ENV Electric Beast X v3 FBL, Rave Ballistic BeastX v3, T-Rex 500 Beast X FBL

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01-11-2010 07:54 PM  8 years agoPost 8
G Steyn

rrApprentice

Heidelberg, Transvaal, Suid Afrika

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No problem Vibe 90.

Checked the Paddle alignment. 100%

Checked all links in the head, all 100%

Checked swashplate level 100%

Used another power supply to electronics, no effect.

With the heli having 716g of Lead (extra) in the nose, the heli hovers perfectly. Hands off with 0 trims.
Without the 716g, the heli has an ever so slight nose-heavy attitude on the bench. With the 716g, it is REALLY nose heavy on the bench(obviously).

Any chances the servos might be acting different with regards to their centering in a hover load?

Concentrate on your weaknesses and your strengths will reward you!

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01-11-2010 09:00 PM  8 years agoPost 9
ErichF

rrElite Veteran

Sutton, NH

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How big is your horizontal fin??? Remember, that thing also catches air, and can upset your aerodynamic balance in hover.

Erich

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01-12-2010 01:22 AM  8 years agoPost 10
mdu6

rrKey Veteran

Montreal

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716gr to balance ... something seems very wrong

It is setup for 120 or 140 CCPM ?

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01-12-2010 04:33 AM  8 years agoPost 11
G Steyn

rrApprentice

Heidelberg, Transvaal, Suid Afrika

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140deg ccpm.

I'll give that one a go Erich. I am using the standard fin, but I've stuck a sticker in the fin to make it solid. The boom supports are still at std. length.

Gee thanks for all the help so far everybody :-)

Concentrate on your weaknesses and your strengths will reward you!

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01-12-2010 04:42 AM  8 years agoPost 12
ErichF

rrElite Veteran

Sutton, NH

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Well, a standard solid fin shouldn't offset over a pound of lead to balance the heli, for sure. Can you post a pic of the heli?

Erich

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01-12-2010 06:40 AM  8 years agoPost 13
G Steyn

rrApprentice

Heidelberg, Transvaal, Suid Afrika

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0deg pitch with TX/heli on.


Paddle Alignment


The Head


The heli


All powered up @ 0deg, and bubble level on tail. Forward tilted swash due to camera angle.


Note the placing of the bottom radio tray for extra mass.

Concentrate on your weaknesses and your strengths will reward you!

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01-12-2010 11:32 AM  8 years agoPost 14
mdu6

rrKey Veteran

Montreal

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Are you still at 0deg on the last picture ?

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01-12-2010 02:17 PM  8 years agoPost 15
G Steyn

rrApprentice

Heidelberg, Transvaal, Suid Afrika

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Nope, the blades are folded back, powered off in the last pic.

Concentrate on your weaknesses and your strengths will reward you!

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01-12-2010 04:52 PM  8 years agoPost 16
G Steyn

rrApprentice

Heidelberg, Transvaal, Suid Afrika

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Ok, I've double, tripple checked the swash, and all the links. The swash was a little to the back, but I mean a little. The flybar did get a knock, since it was slightly miss-aligned when I removed all the links. Paddles were 100%, Tracking 100%.

Currently the heli (using a Futaba 12FG) needs 8 clicks forward trim to hover hands-off. With an 80% full tank.

Interresting removing the horisontal fin only required 1 click of trim less to the front to hover hands-off.

Does that sound right? Sure feels closer to me.

Last question then....

How does one set up the swashplate to be perfectly 90deg on a 140deg ccpm swash? Any tools that I should know about?

PS: Thanks for all the input/help guys....

Concentrate on your weaknesses and your strengths will reward you!

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01-13-2010 08:00 AM  8 years agoPost 17
Spacey

rrVeteran

Pretoria, South Africa

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Hey G,

You fixed up now after our chat yesterday?

Sorry, had a meeting with a couple of engineers and a architect and they were ganging up in front of me while we were talking. Hehe

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01-13-2010 09:06 AM  8 years agoPost 18
G Steyn

rrApprentice

Heidelberg, Transvaal, Suid Afrika

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I think so mate, thanks, I've spent quite a bit of time hover-trimming the heli, and setting up suttle mixes for piros last night, so far it looks very good.

Will be able to analise the flight characteristics a bit later, if the rain holds.

Greetings

Concentrate on your weaknesses and your strengths will reward you!

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01-13-2010 01:51 PM  8 years agoPost 19
raptorheli2

rrElite Veteran

rip off britain and no changing it

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that picture of the paddles doesn't look level to me, that looks quite a bit off?

cheers


www.waterfoothelis.com

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01-13-2010 06:02 PM  8 years agoPost 20
G Steyn

rrApprentice

Heidelberg, Transvaal, Suid Afrika

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Quite possibly the camera angle that is not 100% 90 degrees RH2.

It is set at 0deg with a spirit level, on a pitch gauge.

Concentrate on your weaknesses and your strengths will reward you!

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