I am considering using these instead of standards in my .40 P-51 kit. Instead of (4) 311's I will use (4) 225's for a weight savings of 2 oz. For the throttle I will use an HS-81 instead of a 311 which will save an additional ounce. My question is: Is saving 3 ounces going to make much of a difference at all? Are there any other ways to save on weight?
Not many that are as easy. On .40 size models, I usually use "mini" servos, which saves 2 oz or so.
An ounce here and an ounce there and pretty soon we are talking pounds. Yes, that IS signifficant for a .40 sized kit.
Saving weight is good, but use metal gear servos in a .40 + powered model. Very powerful servos, but whilst the resin gears will handle a diving glider with ease, please visit your LHS and view a packet of gears for a HS225 beside those for a HS422, HS300 or similar which are recommended as standard servos for models up to say a.60 combustion powered model. One of the weight savings of small servos is through use of thin small gears, a quick back lash will simply shear the teeth on the resin gear trains, as is intended. Even large gliders with flaps down can easily shear the teeth on those servos on a hard landing as the flaps "flap" on a spot landing impact. . regards Alan T.
The centering on HS 225 is terrible. I had 4 I bought for a Modeltech Magic. I ended up using something else because with large control surfaces the error made it hunt for straight and level.
I wasn't too happy with spending all that money on such poor performance. I'd have been better off plain old HS 425 and a couple ounces of extra weight.
Wiz
I'd like to hear some more on the HS225, as I was thinking of using these servos in a Dave Patrick Ultimate 40. If that's the case, perhaps I should find a different servo!
Don't skimp for a measly 3 oz. Any decent 40 size model will take ordinary sevos which are also cheaper. What proportion of the AUW is 3 oz anyway! Andy from Oz
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