Engine for 4*60
#1
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Engine for 4*60
I'm building a 4*60 and curious as to what four stroke engine sizes are used. I've got a Magnum 70 and a thunder tiger 90. My instructor recomended the 70, saying the 90 is to much engine. Any comments??
Don
Don
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RE: Engine for 4*60
If you are going 4stroke, I would choose the 90, the 70 is more of a 40-46 size plane motor. Just my personal opinion, but I would not put the 70 on it, I have a Sig SE which is a 40 size plane with an OS 70 4stroke on it and its great, but I dont think I could put it on a 60 size plane and be happy at all.
#3
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RE: Engine for 4*60
That was my thoughts also, just wanted to make sure I wasn't out in left field with them.
I've got the 70 on a Ruperts Dad now, and the designer called for a 52-54 four stroke on it. It's hot, but it flys well. I first put a Magnum 52 four stroke on it and I needed 7 1/2 oz of nose weight to balance out, so I figured 7 1/2 oz of more motor made more since than 7 1/2 oz of lead. It just a bit to much for me right now, so I'm going to try the finish up the 4* in the next few days.
Don
I've got the 70 on a Ruperts Dad now, and the designer called for a 52-54 four stroke on it. It's hot, but it flys well. I first put a Magnum 52 four stroke on it and I needed 7 1/2 oz of nose weight to balance out, so I figured 7 1/2 oz of more motor made more since than 7 1/2 oz of lead. It just a bit to much for me right now, so I'm going to try the finish up the 4* in the next few days.
Don
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RE: Engine for 4*60
I absolutely agree with theo. I too have a 4*60 with a OS 91 FS, and it flys just fine. The 70 would be a real disapointment in a plane like this. Have fun with it, you will really be happy with this plane!
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D
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D
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RE: Engine for 4*60
Depends on how you want to fly it. I have a Saito .72 in mine, and I love how it flies. Now, if I were to buy an engine just for this plane, then I might go with a .90 4-stroke, but as it was I had the Saito on hand. I was pleasantly surprised. It obviously does not have unlimited vertical, but it pulls up nicely from level flight, and does all the aerobatics I want from it. It is in no way a disappointment with that engine.
-Ron
-Ron
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RE: Engine for 4*60
Have Saito FA-91S engines on all three of my Four Star 60s, the latest of which is in the member gallery (2 pics). There is a little stick on the right of most transmitters that controls the throttle. When you get used to it, a .90-.91 4-stroke is great, some even prefer the 1.00 Saito, a good .60 2-stroke is fine or a .75 ST engine.
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RE: Engine for 4*60
Better a bit overpowered than a bit underpowered..
I have a 91 4-banger in mine, and love it. I've also had a [finneky] 90 2 stroke on a pervious one. Good too!
Just remember bigger wheels to give you more prop clearance
I have a 91 4-banger in mine, and love it. I've also had a [finneky] 90 2 stroke on a pervious one. Good too!
Just remember bigger wheels to give you more prop clearance
#10
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RE: Engine for 4*60
Looks as if the 90-91 four stroke wins hands down.
Dr_wogz mentioned props, what props are you swinging on the 90's?
Don
Dr_wogz mentioned props, what props are you swinging on the 90's?
Don
#11
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RE: Engine for 4*60
I've had 2, one with an OS .91FX and the other with a Magnum .91XLS, both with Ultra Thrust tuned mufflers. Nice power, great vertical. You need to go with the .91 4-stroke. I also have the Mag .70 FS and it's good on a .46 sized plane. The 4*60 is too large unless you want to putz around.
The gear on all the 4*s is crap. I moved mine the the wing, wide spread. It gave excellent tracking, hands off, on take off.
The gear on all the 4*s is crap. I moved mine the the wing, wide spread. It gave excellent tracking, hands off, on take off.
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RE: Engine for 4*60
Go with the 90 four stroke,I have a ST 75 in mine and it's great,you will not be a happy camper with anything less. Infact im going to build a second one with a saito 1.00 in it.
As far as the landing gear goes,yes its a little weak but i haven't had any problems with it.
and dont worry about prop clearance you got plenty
As far as the landing gear goes,yes its a little weak but i haven't had any problems with it.
and dont worry about prop clearance you got plenty