What would be a good engine for a Seagull Ultimate 40? I was thinking of Saito 82 or a O.S 70 or 80 four stroke. I need power and would like to be able to hover but did not want to load the nose with to much weight. Any other suggestions on the build would be aqqreciated.
Jamie

The 82 should be spot on jamie

OS 56 or 70

from what have read you need a little weight in the front. do either of you fly this plane?

The only Seagull Ultimate Google comes up with is a Ultimate 46. Guess it's the one.....

The pictures show an Ultimate that is very, very close to the same as my WM Ultimate 40, which is no surprise. About the only difference seems to be a rather overdone top wing attachment for the Seagull. What is significant to your question is the ailerons on the two seem identical. They're narrow strip ailerons.

Strip ailerons aren't the design of choice if you're wanting the plane to hover or 3D. But you'll see for yourself I'm sure.

The Seagull wingspan is only 1" different than the WM, yet the Seagull weight is about 6.5 lbs. My WM weighs 4lb 9 oz. Mine isn't what you'd call a 3D. With an OS46AX on it, the plane is a rocket. With the smallish surfaces, especially the ailerons, when there is no airspeed, control suffers.

I'd say your choice of engines is good. Your model's weight is going to work better with more, not less horsepower. But don't expect to have really good 3D. The weight loading is working against you as are the thin ailerons. There is a reason 3D models have ailerons that're 1/4 to 1/3 the wing area.

Thanks for the info! That is what I figured with the weight of the plane 3D would be limited and a larger engine would be helpful. A flying buddy has a Funtana with a O.S. 70 and it has plenty of power and it weighs more. I am wanting power and balance, I don't want to put it on the runway and have it tip over! I guess I am asking what can I put on it with plenty of power and not cause balance isssues.
Jamie

Like he said, a 3D plane this is NOT.

The Four Stroke .70 is not much different in weight to a 2 Stroke .46 often used for the plane, so it will not be problematic.

If you are flying onto or off of grass, omit the wheel pants and put on larger wheels.

I have one Ultimate 40 where I've put on 2.75" or 3" foam wheels.

It looks a bit like a bush plane with wheels of this size, but it lands well on grass.

You do want to hold up elevator whenever you are taxing around.

I have read some threads about turning the landing gear around so it does not nose over on taxi. It moves the wheels forward instead of being swept back. I will be flying off grass so thanks for the advice on the wheels. Opjose what are you powering your Ultimate with and does it have enough power ?

I have several.

I'm using O.S. .46AX's and Tower Hobbies .46 engines.

I have one of the former side mounted and one of the later inverted.

With plenty of power or could it stand a little more?

Plenty of power.

But aren't yours World Models Ultimate 40S ? It's over a pound lighter than the Seagull advertises.

I've flown the Seagull with the AX 46 many times.

I can't say I noticed any difference between it and the WM on verticals, but I may have had heavier battery packs on the WM.

The Seagull was designed as a .40 and the 46 pulled it along very nicely.

I have a YS 63 in mine, and solved the landing gear problem (too weak) by ordering a replacement from TNT.

Fly safe, Glover

Glover, I am leaning toward a O.S. 70 does your YS have plenty of power for that bird?
Jamie

Yep. I use a 14*4W prop.

Fly safe, Glover


PS In my Seagull Ultimate 90, I run an OS 120 with a 17*6 prop. (A YS 110 with 16*4W also worked well in this toy.)

I've got the Seagull Ultimate with a 46FX and a pitts muffler. Plenty of power for me, but I never tried to hover it. ( I don't 3D very well anyway) Fixed the noseover problem by turning the stock gear around.

Scott, did you build it like the instructions and put the battery up front, does it need weight in the nose? Did you make any other mods to it other than turning the landing gear around?
A friend of mine is pushing me toward the 70 (he does not have to push very hard) I like the sound of his in his Funtana. The 70 is a few ounces more than the .46 and I am hoping to balance it without any extra weight in the tail.
Jamie

I assembled it per the instructions, and put the battery in front. No extra weight was added. Turning the gear around was the only mod I made. It makes ground handling much easier. I put the 46 in mine, because that's what I had laying around when the plane was given to me (Christmas last year). It turned out to be a nice package....and it's plenty fast. I cut the pitts muffler tubes off short, and added a pair of silicone extensions that hug the underside of the cowl. Looks nice. I've got to say that this is one tough little plane. On it's maiden flight, I cartwheeled it down the runway trying to takeoff, and once I slowed it down too much on landing, and it pancaked from about 5 feet....not a scratch on it....tough little plane. If I ever total it, I'll buy another.

Doesn't your YS have a supercharger in it?

If so it is probably more powerful than the O.S. .70 he is contemplating.

He should be able to run a 12x6 or a 13x4 prop with his engine that should give him plenty of pull. The former would give him the best all around performance.

glover1482

me too ,
i have a spare YS 63FZ-S engine and i was looking on the Seagull Ultimate 40 ARF.

Here is more info on the airplane.
==========================

http://www.jperkinsdistribution.co.u...%20-%20Seagull

===========================

Kostas
Greece

PS. All you guys that already have this ARF , -P-L-E-A-S-E- post some pics of your airplane!!!!

The YS 63 pressurizes the fuel system, but supercharged? I don't know. It is an engine that I've used in profile/funfly models of about four pounds (OMP Fusion and Edge). It is very reliable, and is more of a torque producer than a high rever. The YS 63 pulls my Ultimate very nicely. (In my opinion the Ultimate is not an ideal 3D toy as it is flown quite a bit faster and has a higher wing loading than is typical for 3D flight.) I think that the OS 55AX would also be an excellent choice for the Ultimate. Pictures of my Ultimate would look just like those found at the Horizon web site, except that mine has no decals as I almost never install them.

Fly safe, Glover

I know that the larger YS engines have superchargers, but I am unfamiliar with the YS 63.

As YS puts it "Crankcase supercharging system unique to YS 4 stroke engines" which leads me to believe that they all do.

If it does the YS 63 would be far more powerful than his O.S. 70, and other threads I found seem to bear this out.

Apparently he may already have the O.S. 70.

Scott that is a nice clean look. I don't have an engine yet I am still looking and am open to all uggestions.
Jamie

Yeah a side mount two stroker of the right size with a Pitts style muffler doesn't leave a lot exposed.

The engine in the picture is just a bit too tall to hide it completely ( not that there is anything wrong with that arrangement! ).