haroldpo6

My Feedback: (10)

I plan on using a saito 100 (what i have) and i'm a little concerned about tail wt. Would it be better to use one elevator servo and the torque rod system or go with 2 servos. If i go with 2 servos which is the lightest servos i can get away with? The torque rod system i plan on using is a little more beefy than the kit one. Also what battery is most using and where are you putting it?

daveopam

My Feedback: (9)

Harold, I have a 1.25 on mine and I use three FU3305 servos with metal gears in the tail. Even with this and a 5C 6.0V pack in the TE of the wing. I had to put the engine back really far on the mount. So much so I had to notch the fuse for the velocity stack. I am not sure if there as any weight difference in the 1.25 and 1.00. If there is it's not much.

So my suggestion is, use two elev servos so the tail is solid. Then worry about the CG. If it's like mine you need the weight back there anyway.

David

haroldpo6

My Feedback: (10)

Thanks David, about a 4oz diff. in engines.

daveopam

My Feedback: (9)

That's good. That way you can slide the engine out on the mount a little further. Mine flys better as it burns fuel so I am sure I could go even further back on the CG if I needed to.
Do you have the right radio to drive twin elev servos?

David

haroldpo6

My Feedback: (10)

Yea, i got a futaba 9C. I was concerned about being tail heavy with 2 MG servos for elevators + 1 for rudder.. I have quit a few hitec 625mg, 645mg, 5645mg and a pile of 475HB servos. What size fuel tank are you using for the 125? I was thinking of a 10oz.

AFSalmon

My Feedback: (3)

Pretty much everyone goes with two for the elevators these days. More solid control and redundancy is always a good thing on elevators.

haroldpo6

My Feedback: (10)

Thanks Mike, of the servos listed which would be best to use for say, elevators, rons, rudder?

daveopam

My Feedback: (9)

I am not sure of the tank size. It's the one that came with the ARF. The servos I have in the tail are 130oz on 6V. Yes these are overkill, but like you I had them. These things build pretty light so anything over 75oz on the rudder and aile should be good. I would think a pair of 50oz servos would be fine on the elev. Speed might be another servo issue. I really like the speed with a 6V pack. Your servos may already be faster than mine, who knows. One thing on the linkage. My ARF is the old one and called for Z bends on the servo end. I can't say I am a fan of this. So on mine I used HD Dubro arms on the servos with ball links on the threaded end of the rod. On the control surface end, I cut the rod to length and soldered on a metal clevis. The new ARF may be different?

David

haroldpo6

My Feedback: (10)

Well, i tried the 3 servos in the tail, 2 hitec 625mg for elevator and 1 hitec 5645mg for rudder and with the saito 100 as far out on the rails as i could get it, 2 1/2 oz of lead(all i had) , battery on top of engine, and took the tail gear off, it is still tail heavy. Balance point is 9 1/2in to 10in from leading edge at root. All 3 servos wt is 6.15oz. Thinking of going with 1 5645 for both elevators and 1 5645 for rudder @ 4.15oz, saving 2ozs. I think 168oz-in servos will be enough. Also might use a 6 cell 2000 mah himax instead of the 2 cell A123 1100mah battery to put some more wt on the front.
Any thoughts out there.

daveopam

My Feedback: (9)

I am shocked that there is that much difference. The only thing I can think is CF pushrods in the tail, lighter servos, OS 1.20AX in the nose. There is a guy on here that put a pull/pull on his rudder and mounted the servo way forward. Not sure how he did it. His name is Spacey if you want to PM him or find his threads.

David

haroldpo6

My Feedback: (10)

I've got some hitec 475HB sevos @ 1.5oz ea ( 625mg @ 2.10) you think i will strip the gears on the 475HB's? Also looking for a LNIB saito 125, anybody got one?

daveopam

My Feedback: (9)

Striping the gears should not be a problem , if you fly the plane like it was made to be flown. Put a big pitch prop on it or dive it under power, you could be in trouble. Using one servo for both elev's would be a last resort for me.
Maybe you can find a 1.25 worth the money. As much as I like my 1.25 don't overlook my other suggestion. the OS 1.20 AX is a nice unit. I have one on a GB Ult bipe. Starts on the first back flip every time has a smooth idle and pulls HARD with a 17x6APC.

David

AFSalmon

My Feedback: (3)

Wow, that is hard to believe a 67" Fusion being that tail heavy. Mine is a recent stock ARF, has the 120AX in the middle of the engine mount. 5 cell 2100 MiMh battery in the middle of the wing, and 3 metal gear digitals in the tail. The original Fusions had the option to put a joiner rod between the elevator halves and use just one servo. If you have not glued in your elevators yet you could try that option. The Saito 100 will be an ok engine but not "bro power". You could just fly it with this setup and some nose weight and then upgrade to perhaps an 120AX or 125 at a later date.

haroldpo6

My Feedback: (10)

I've got a saito 125 coming for it. What size fuel tank should i use? Was planing on using a 10oz for the 100, but not sure with the 125. I don't like to use dead wt. if there is a way around it. Built mine from a kit not ARF. Could be the neon monokote i used for the covering, that stuff is heavvvy and he!! to apply, never again. Grandson had to have that color. His plane you know.

daveopam

My Feedback: (9)

Harold, I bumped a thread to the top for you. It is the "Saito stack to close to the fuse" thread. I put this up so you could see the pictures of the 1.25 mounted. As you can tell I have it way back. This is an ARF , but I am building a kit as well. Just from the feel of the fuse, I think the kit fuse is a little heavier. I wonder if your Gorrila glue got to thick in the back? This kit is a back up for the ARF so I have no idea what the balance will be until I stuff the ARF. Knock on wood, I hope that will be a long time.

David