Moving the cg forward

[murry]

I can't tell the difference

[rcdart]

Mine was cg @114mm with the four tail servos, the plane was like porpise and would not lock in, the 1" arms give me heaps of throw for IMAC, the plane flies unlimited no worries at all. Whilst I believe that you would get away with the 2 rudder servos, I preferr to stick with three.

[Extra260]

When you say that I could get away with it do you mean it would be marginal performance??? If so I will use 3. I only do Imac so if that makes any difference. Murry could you post more pics of inside the hatch all around???

[murry]

pic

[Dan767]

I have three 5955's, on the rudder in a SWB self adjusting tray, located just aft of the fuel tank. It's better to locate the tray as far forward as you can. I've not seen the Greves pipes in a while, so I can't remember if they are in the way like my 3W cans are.

[Extra260]

	Quote: Originally Posted by Dan767
	I have three 5955's, on the rudder in a SWB self adjusting tray, located just aft of the fuel tank. It's better to locate the tray as far forward as you can. I've not seen the Greves pipes in a while, so I can't remember if they are in the way like my 3W cans are.

would you say that it would be marginal with two??? Is there plenty with 3??? I dont know about the self adjusting because I dont really want to dish out 245 on a tray. It sounds like I will get 3 5955's though.

[Dan767]

The way that I look at it, the manual calls for a total of about 800 in.-ozs. of torque. If you only use two, you're going to be short of what you need. This rudder is big. The reason I strongly suggest the self adjusting tray is the possibilty of a servo/receiver failure. With a self adjusting tray, if something quits, you still have at least partial rudder control. In a crosswind, that's money.

BTW, From SWB's website, $225. It's the one with the cables, jut to avoid the possibilty of confusion, but I'm sure we're talking about the same tray.

[Extra260]

I will deffinetly get 3 servos but if something quits I will probably land. Unless I am reading your post wrong. Will I need and offset tray or straight.

[Dan767]

The 3X self adjusting tray has the 5" arm that you need. I would call or e-mail SWB and let them know what you're building. You will also need to order the double lock arms for the Hitec Servos as well

[Extra260]

	Quote: Originally Posted by Dan767
	The 3X self adjusting tray has the 5" arm that you need. I would call or e-mail SWB and let them know what you're building. You will also need to order the double lock arms for the Hitec Servos as well

In my thread called set up my 40% I have what I have bought. All I need are the rudder servos and I tray. But I dont see the huge andvatage to spend 150 more for a tray. I think I will just got with the regular tray with offset.

[Extra260]

How about I use the supplied carbon tray and move it under the tank. Could that be possible???

[Dan767]

Yes it is. Use the two formers and locate it anywhere you want. You can also figure out a way to epoxy it anywhere without the formers.

[Extra260]

Do you think that would help with the cg Dan? Then I would just have to get an offset arm for the 3rd servo right??? The carbon tray would also be lighter than a swb tray right??? Could it even fit under the greeves pipes under this location? Could you post some pics of your set up??? thanks

[brownj]

E260, Dan, others,
I will very respectfully take issue with the need for 3 rudder servos in your 260, especially if you ONLY intend to fly IMAC. I first want to say I fly a MX2, so I want to put that up front. BUT, I use two 8611A's in the tail with the push-pull set up, identical to Mark Trent's, flying Razorbacks's, etc. I don't think the two planes are so vastly different that my (and others) set up can be discounted. I've flown both, although the 260 was a friend's, so I didn't fly it very agressively (but lovely flying plane).
http://www.marktrent3d.com/mx2build.html
My MX2 will knife edge loop with authority, IMO a true test of rudder authority. And I don't have any balance issues with the rudder servos in the tail. DA150, MTW cans.
Not trying to start a disagreement thread here, just my experience and opinion.
Good luck with your plane, You'll love the way it flies.
Jim

[Extra260]

I dont think that I will mount them in the tail though because with only imac I cant have it tail heavy. Other wise I would. The only question now is will 2 in a tray up front be enough. I might just end up getting 2 8711's for weight.