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Futaba-RC . Next D . Fast Lad Performance

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Tandem Rotor Helis Vertol Chinook > Gyro Settings for Tandem
 
 
Lockwire
Heliman
Location: Kalkar - Germany

Hi

I am in the middle of constructing a tandem as well (Vario Chinook).
Getting to the point where electronics are installed and am just wondering if both the gyros are switched to Heading or Normal mode ?
Or any other combinations of course............

Regards

leon
07-01-2007 Over year old.
 
 
autorotater
Heliman
Location: California

Leon, explain more about which tandem you are building. I have a hirobo CH-47 but it has a multi axis gyro. I have a Vario CH-47 fuse but I don't have any mechanics for that fuse yet. I am enterested in knowing what mechanics you are using to put in a Vario CH-47 fuse.

Dan
07-02-2007 Over year old.
 
 
rha
Heliman
Location: North Yorkshire, United Kingdom

Hi Leon

On my scratch built Chinook based on the Vario fuselage I'm using the new Helitronix Multi-mixer and 3 gyros. I have a CSM180 on the pitch and roll and a GY240 on the yaw. The pitch gyro is turned up to 100% gain and the roll about 25%, the gyro on the yaw is about 30%, the only gyro I found you need on a tandem is the pitch. I haven't tried a heading hold gyro.

Rich

07-02-2007 Over year old.
 
 
Lockwire
Heliman
Location: Kalkar - Germany

Hi Autorotater

Building this thing from 2 Graupner Uni Mechanics. The beauty of these are that they are modular so you can use specific parts only without having the weight of the whole mechanics. Inserted a link here.

[url=https://shop.graupner.de/webuerp/servlet/AI?ARTN=4450.L]

I made an aluminium frame between them with a Zenoah 230 RC on there. Did a very smart thing (I guess) by looking on Ebay for a 1:5 RC Car (trashed one) with a Zenoah. Their gear boxes and clutches are excellent for this matter. Alaso there is a disc brake on those gear mechanics....Superbe. The controls I purchased is from Flugmaier....Donīt know whether it is the best but it works so far. Well letīs see during the maiden flight.
07-02-2007 Over year old.
 
 
Lockwire
Heliman
Location: Kalkar - Germany

Hi Rha

Wow. 3 Gyros....have to do a recount. Thought you had to put one on nick and one on yaw. The third one on pitch is new to me. Can you elaborate on the need for that one ? Because you mentioned that thatīs the one you really need and I guess that is the one I didn,t count on.

Regards

Leon
07-02-2007 Over year old.
 
 
Helitronix
Senior Heliman
Location: Marlborough, MA - USA

Three Gyros

The pitch axis (elevator axis) is the most sensitive axis on the tandem. It's the least stable, and needs the most assistance to dampen it out. If you use only one gyro, put it on this axis.

The yaw axis doesn't need a lot of help because you have two rotor heads that provide a nearly equal counter torque. Still, I think it's a good idea to have a gyro on the yaw axis, because it still helps, because the torque does not balance out 100% of the time. And any imbalance will induce some rotation in the yaw axis.

The roll axis is relatively stable, and doesn't really need a gyro. But, it can still help out depending on a variety of circumstances.

You might need less gyro stabilization if you use a flybarred head (compared with the 3-blade heads).

But why fly with 4 rotor blades when you can fly with 6? :-)

Joel-
07-03-2007 Over year old.
 
 
Lockwire
Heliman
Location: Kalkar - Germany

Hi Helitronix

I was aiming for 2 Gyros (Nick and Yaw), I assume they need to be on normal mode , not heading or am I wrong in this one ?

I have 6 Blades for it but not the rotorheads yet. As I have heard and perhaps you agree, it might be good to do the first couple of flights with flybar, then switching over to 3 (6) blade configuration.

THX

Leon
07-03-2007 Over year old.
 
 
Helitronix
Senior Heliman
Location: Marlborough, MA - USA

Leon,

I don't have much flight experience with the gyros in heading hold mode on the rotor head. I had just started to do some heading hold gyro experiments with my tandem test bed last weekend, when I had a mechanical failure of a claw coupler and caused the destruction of all 6 blades. I had about 3 minutes of flight time with heading hold on the elevator axis, using a Futaba GY-401, and it was working just fine. But it's hard to say what it would really do, since I didn't have enough time to try it out. On the other hand, I've been flying rate mode gyros on my multi-bladed machines for almost 4 years, and that configuration works great as it is.

I don't really have an opinion about starting off with a 2-bladed head versus 3 for your initial flights. When configured properly, and using gyros, the multi-bladed head works incredibly well and is quite stable. I don't see any particular advantage to using 2-bladed heads instead, other than the slightly reduced cost of a crash. Either configuration would work ok as far as I am concerned.

Regards,
Joel-
07-05-2007 Over year old.
 
 
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Ace Hobby . Esprit Model . Thunder Power RC

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Tandem Rotor Helis Vertol Chinook > Gyro Settings for Tandem
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