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U-Can-Do Saito 100 or OS 91fx?

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U-Can-Do Saito 100 or OS 91fx?

Old 07-29-2010, 11:38 AM
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tripower222
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Default U-Can-Do Saito 100 or OS 91fx?

I have both motors but cant decide which to use I think the 91fx would be a bit more power but I tend to favor the 4 strokes. If anyone has experience flying with both engines (on the same plane) I would appreciate your opinion.
Old 07-29-2010, 12:24 PM
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Default RE: U-Can-Do Saito 100 or OS 91fx?

What size U-Can-Do?
Old 07-29-2010, 05:32 PM
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Default RE: U-Can-Do Saito 100 or OS 91fx?

Tri:
I have not flown the Ucan Do, but on engine size, for the power, go with the 91FX. The Saito 100 has less power in that range, you would need a 125 at least and then a shy short of power. IMO I woulduse the 91FX. You are trying to decide on what engine to use. Find the aircraft's manual, and it will state what engine is correct for this model. Use the power formula, for 2 stroke cc"s multiply by 1.5 toget a 4 stroke equivilent, that should help on your decision.
Old 07-29-2010, 05:32 PM
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Default RE: U-Can-Do Saito 100 or OS 91fx?

U-Can-Do 60
Stock Number: GPMA1270
Wingspan: 65 in (1650 mm)
Wing Area: 1072 in² (69 dm²)
Weight: 7-7.3 lb (3175-3345 g)
Wing Loading: 15-15.9 oz/ft² (46-48 g/dm²)
Length: 69.5 in (1765 mm)
Engine Required: 2-stroke .61-.91 cu in or 4-stroke .70-.91 cu in
Old 07-29-2010, 11:29 PM
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timcat26
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Default RE: U-Can-Do Saito 100 or OS 91fx?

I just maidened a U Can Do 60 today with a Magnum 91 FS. The engine's new so I'm still running it pretty rich and it still pulls this plane around just fine.

It's not a speed plane and GP has a Tech Bulletin out about not flying the plane full speed unless you're at a minimum 10 degree up angle. This plane is designed to be a slower flying 3D bird. The Saito 100 ought to give it all the pull and torque it needs while not overpowering it. I'd go with that one for this plane's design, along with a wide 4 pitch prop to give you more low end pull. Our Club President has this setup and he can do any maneuver he needs to with it.

BTW, you'll love this plane. It's the first one that I've maidened that I was able to grease the landing one the first try. It floats right in and sets down gently. I did put a brace on each side of the gear running to the fuse just behind the firewall to keep the gear from folding back on a tougher landing.
Old 07-30-2010, 10:02 AM
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tacx
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Default RE: U-Can-Do Saito 100 or OS 91fx?


ORIGINAL: tripower222

I have both motors but cant decide which to use I think the 91fx would be a bit more power but I tend to favor the 4 strokes. If anyone has experience flying with both engines (on the same plane) I would appreciate your opinion.
Tripower,

Your going to love this plane. Mine has a 2 stroke .61 Thunder Tiger Pro with a 14x4 wide prop. It flies great. Like Timcat says, It's not a speed plane. I have known guys who overpowered them and actully ripped the wings off. They even tell you that in the manual. Mine has plenty of power with the .61. It will pull the plane staight up with no problem. The 14x4W prop keeps it slow with gobs of torque. My friend has the same plane with a O.S. .91 on it. It also flies great, He can punch it staight up as soon as it leaves the ground. The plane is my most favorite to fly. It loves flying in the wind and will land like a balloon. In fact after a few landings with the UCANDO, you will need to be carefull landing your other planes. Most won't land as slow as the UCANDO.

I say put on the .91 and have fun.
Old 07-30-2010, 12:28 PM
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w8ye
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Default RE: U-Can-Do Saito 100 or OS 91fx?

I have a UCD 60 with a Saito 125 and a APC 17 X 4W prop. It performs very well and has all the power one needs for vertical work.

I had another with both a Saito 100 and a 91FX in it at one time. It performed well with these engines also but I like the new one with the 125 best. I only use full throttle when pulling out going straight up.

For 3D type flying, the four strokes have more low end torque and grunt which is important.

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