Engine Weight for SE
10-20-2003 | 08:00 PM
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From: madison, WI
Engine Weight for SE
I am currently working on a Sig SE and am planning for the engine purchase. I've done searches and found that the engine compartment limits options for a four stroke, and I haven't found anything about how much weight is about right for the engine. I am hoping to put a Saito .72 on it but don't want to do a bunch of modifications to make it work. The plans suggest sticking with a two stroke. Any comments on engine weight and size? Thanks
Bill
Bill
10-21-2003 | 06:05 PM
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RE: Engine Weight for SE
Thanks - I'm probably going to go with the Saito .72 now that I know that I don't need any major modifications. Otherwise I'm thinking the MVVS .49 or the Irvine .53. I've also thought some about the Webra .50. Too many choices!
Bill
Bill
10-21-2003 | 09:08 PM
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RE: Engine Weight for SE
In my experence the SE builds tail heavy so most two stroke engine (OS) mounted normally result in a tail heavy plane unless you significantly move the engine forward on a long engine mount. Then the spinner looks dumb. A Saito .65 0r .72 will balance the plane much better in my humble opinion.
10-22-2003 | 03:37 PM
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RE: Engine Weight for SE
I have a YS .63 in mine and even with the solid wire tail braces, it's still nose heavy. But, it's only off of the forward range by about 1/4". I personally wouldn't worry about the engine weight as the CG is easy enough to correct by moving the RX battery to get the balance right.
John
John
10-22-2003 | 04:37 PM
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RE: Engine Weight for SE
<<...YS 63...still nose heavy...>>
So was mine. Even with the battery under the servos, it still wouldn't snap well.
Keep in mind that the YS 63 is considerably smaller than the Saito; about the size of an OS 46 FX, in fact. If it is not too late, you might want to move the firewall back a half inch or so to allow for carburetor clearance on the Saito.
In any event, make it a four-stroke. My first SE had a .46 two stroke, and while it was plenty of power, the torque and larger prop of the four stroke makes for more pleasing flight characteristics, IMO. You can FLY through manuevers, as opposed to darting through them.
YMMV...
Steve
So was mine. Even with the battery under the servos, it still wouldn't snap well.
Keep in mind that the YS 63 is considerably smaller than the Saito; about the size of an OS 46 FX, in fact. If it is not too late, you might want to move the firewall back a half inch or so to allow for carburetor clearance on the Saito.
In any event, make it a four-stroke. My first SE had a .46 two stroke, and while it was plenty of power, the torque and larger prop of the four stroke makes for more pleasing flight characteristics, IMO. You can FLY through manuevers, as opposed to darting through them.
YMMV...
Steve
