Well I'm taking the st 90 off the seagull Ultimateand installing a saito 125, can someone tell me how much right thrust and down thrust they have been adding? I have heard around 2 to 3 degrees right and 2 degrees down does this sound right?

Thanks for any info.

Ken, I shimmed mine to match the nose on the cowl. I don't recall any down thrust, but it did take some right.

david

Thanks David, that was how I did the st90 and it took a few clicks of right rudder, Would 1 to 2 degrees help?

Well we ran the ultimate today with the 125, it seemed to do ok but didnt quite seem enough, It may be its not completely broken in yet but I am wondering if I should change from the 16-6 prop to a 15-8 does anyone think this will do better?

I have seen great 3D performance from a Seagull Ultimate using an APC 17 x 6 prop, powered by an OS 120 AX.

Then maybe this prob will be ok since the motor is still on its first gallon? I may go ahead and keep running it on the 16-6 for a few more tanks to see if it picks up some as i have been reading the 125 gets better the more fuel ran threw it.

Try a DLE 20cc gas engine...once you do Gas....you will park your messy , expensive to run Gow engines. Capt,n

Iplan on going to gas at some point but not yet all of my fleet is either 2 or 4 stroke glow.

I don't know what kind of flying you do. But the Saito 1.25 on this plane is a good sport flyer. Vertical will not be unlimited by any means. That being said, as long as you don't care if it hovers or 3Ds the 1.25 is a good choice. It will get better with time. I would leave the 16x6 for now.
Curious, why do you think it needs more right thrust? Also, have you checked to see if everything else is straight? When I assembled mine I had a hard time getting the top wing mount straight. Lay a yard stick from it to the rudder post and see if it's dead on. I spent a lot of time getting mine right.

David

Thanks dave for the info, Im not looking to 3d just the average sport flying, I do agree with you about leaving the 16-6 on for now, It flys ok just seemed a little slow but then again it is still on its first gallon. The reason for right thrust was I had one of our top flyers mention he had to add quite a bit of rudder and that right thrust would take it out, we flew it sunday and it did seem to hlep so i may leave it as is for now but i will deff check it with a yard stick to double check things. thanks again for the info..one more question though, you mentioned the 125 wont give it unlimited vertical, I thought I read some were on a thread on here that it would?

It would not on mine. It had decent vertical but no where near unlimited. Could be I had a heavy example. I sold it because it was so heavy compared to the Goldberg of the same size. I think the canopy with pilot bust weighed 1/2 a pound. To be fair, I never ran the 1.25 on the Goldberg I bought to replace it. The 1.25 went to a profile and I bought a 1.20AX for the new bipe.
When you start checking everything for straightness. Also look at the inter plane struts. Mine were putting a slight twist on both wings when I bolted them up. I noticed one day the covering would wrinkle a little when I bolted them in. It was not off much, but I am picky. The fix was easy, I just elongated the holes and it relieved the pressure.

David

Hey Dave, Thanks for the info, Ya I miss my goldgerg ultimate, sadly it's experation date came up a few years back..... , but Iknow what you mean the seagull doesnt fly quite like it, the goldberg was a bit lighter, heck I ran a os60 on the goldberg for quite some time and it flew great. I will double check the things you mentioned. I still love ultimates though biplanes look so cool in the air.......

The Ultimate is one of those planes I will always have in my stable.(67" OMP Fusion is the other) The ARF I have now is my 3rd GB. First two were kits. Both of those were ST 90 powered and both flew better than this ARF I have now. Maybe Great Planes will reissue the kit some day.
Also, please post if you found anything off on your plane. There may be others reading this thread that need to check theirs.
David

Ya I deff hope gb will release a kit again some day, I loved the gb ultimate, it flew like it was on a wire. But since i could nto find one i had to go with the seagull ultimate, it does ok so far, im still testing it and breaking in the motor only about 3 quarts threw it so far and running better everytime, I did go to 30% heli fuel with 21% oil and it made a big diff in power, even with the 2 degrees of right thrust added we still ahd to trim in some right rudder but not enough to worry about and i need to take an ounce out of the lead box its just a tad to nose heavy. I'll post back after this weekend with the changes.

Well I took it out for some flights saturday and everything when great, Power seemed ok esp for the new motor. Ideff need to turn the rates down on the alerons very very twitchy.lol even with 30% expo..lol

One thing I noticed on mine as I tried a lot of different CG settings. If I got the CG to far back the plane would not stop instantly after a aileron roll. It would wobble a little bit after I centered the aile stick. I fly/flew all my GB Ults at 3.5" with the plane inverted using the lower wing at the fuse. For some reason the SG did not like the CG this far aft. It was not snappy by any means but was not as solid as I like. Just a thought on your aile problem. lol


David

That may be the issue, After installing the 125 in it I have been playing with the cg, though I do have the rates very high, Ive always set my plans up that way for some reason. It seemed better this saturday and sunday, very stable, well unless you count the one time I stalled it at about 80 feet and it fell out of the sky....the good thing was it pulled out at about 25feet above the ground....lol at least thats what everyone is telling me.....lol it does dead stick very good....ran a tad bit t long and on final righ above the run way she ran out of fuel...Gatta love thie plane.....

Every dead stick with an Ultimate is a gut checker

David

This is so true, Ihade 3 great flights over the weekend, the saito keeps gettin better and better. After a few gallons what prop would be best to try? 16-8 or 15-9? Im trying to look for alittle more speed.