I am currently finishing up my 4 * 60, I originally bought a TT .60 to go in this plane. I have installed the mount and drilled the holes to fit in the engine.

The problem is I have decided to look at a Saito 100 to power this plane.

Can anyone offer some suggestions as to how much trouble it will be to install the new engine.
I dont have the engine yet but I am sure it wont mount in the same holes as the TT.

I am thinking that I will have to go with a whole new mount and re-install everything. This may be a problem because I have already installed the tank and the top deck sheeting.

Any thoughts, experiences, or ideas welcome.

Thanks

Dbow

The 4* mount is VERY strong. I did the same exact thing, TT 60, then a Saito 100. I just moved the Saito back, so it's front mount holes were halfway between the TT's. Unfortuantly, I pile drived her in a full speed from WAAAY up, must've been doing 80 or 90 went she went in. Plane was totalled, had to dig the engine out of an 8 inch hole. But the mount survived unscathed.

I just fitted a Saito 100 in a 4*60 a couple of months ago. I agree that drilling new holes in the mount won't cause any problems. In fact this will be the easiest part.

But the throttle linkage for the Saito is on the opposite side from most 2-strokes (not positive about the TT) so you will probably have to install new control tubing and swap the servos. Getting it set up will take a little work. Also there is very little clearance on the 4* for the Saito rear carb hookup but there are ways around this too.

The Saito 100 is a thirsty beast so I went with a 16 oz tank to get flight times up over 10 minutes. And I would break the motor in before mounting it on the plane. The break-in process is a lot longer than a small 2-stroke and the extra vibration during rich break-in is tough on the plane.

I attached a pic showing my throttle hookup (blurry, but it should give you the idea).

Sorry, the attachment "didn't take". Here is the pic:

THanks for the info, I thought I was going to have to take the top deck off to redo the mount. Sounds like it should be o.k.
I like the idea of the 16oz tank and I have one I can put in if I can get the kit tank to come out.
I tried the 16oz before closing the top deck but the tank I have is the sullivan slant style. The tubes coming out of the front of the tank hit the top of the deck, so I went with the kit tank.
I will have to look at it again.

I have not installed any of the control rods yet, so that wont be a problem. I basically just fitted the TT in there and mounted it but did not run the trottle rod yet.


Thanks for the info.


Dbow

I just assembled the ARF version with the 100 and an APC 15x6 for my brothers second plane. It is quite nice with that combo. The thing takes off in about 5 feet on a paved runway. I did have to relocate the throttle pushrod as noted already.

As far as fuel usage, we are using the stock tank (just under 13 oz) and getting 10 minutes easy. Build-n-flyer have you leaned out your low end, it is quite rich from the factory... if not that may affect your fuel consumption.

Go nuts,
Scott.

The amount of flight time you get is going to depend on how hard you fly it. With the Saito 100, you could putt along all day just above idle. If you're a speed freak (not a good idea with that plane), 13oz won't last long.

I'm using a 12oz tank with my 91 and I easily get 12 minute flights. I prefer smaller tanks to keep the weight down.

Tom

I like the 16 oz tank! Was able to keep things on the rich side during the break-in and still got a reasonable flight time. Now that the motor is fully broken in and leaned out I can get 15 minutes without running on fumes at the end!

The four star seems to handle extra power really well. I have a 4*60 with a YS .91 FZ with a 14 oz Sullivan tank and a 15x6 APC. The Saito 100 should fly pretty close to mine if not identical. Hovering is not problem, I added 1 inch extra to the rudder and to the elevators and increased the throws which allows the plane to knife edge with no problem also. I incorporated a pull pull system and dual elevator servos, which saved the plane a couple of weeks ago when one of the elevator servos stripped out in flight. I hate to imagine if I had one and it went out. With flapperons engaged, full flaps down and 8% up elevator, this slows the plane down nicely and keeps it level. Can crawl pass the runway if you want to, then take off vertically with no hesitation. With extra power on this plane, make sure there is no flutter in the stab. My stab fluttered severely until I relocated the control arms which seemed to resolve the problem. With these motors (YS 91 or Saito 100), the plane should not be given throttle when diving. Extremely too fast, which could lead to failure of some type. Other than that, this plane loves the extra power and flys wonderfully.

Just my opinion of the plane with high powered motors,
I will try to post some photos of my plane once I get the photos in digital format.

Derrick

Not familiar with the Saito 100 but can't you reverse the carb like other Saitos? MAX H.

Yes, you can reverse the carb on the Saito 100 but the carb is offset and reversing it positions the throttle linkage at the center of the motor. This worked well on my 60-size 300S but doesn't help when mounting the motor on a 4*.

Just finished putting together my 4-star. I also have opted for the Saito 100. From what I heard this is a very good combo.
Tommorrow will be her maiden flght .

Ahh, yes, the Four-Star is an awesome plane. but have you ever tried a Cor-Star?]