Gliders > Thermal / Flat field

good 2.5m+ sailplane - which one ?

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gerryb:
hi denis,    'the guys in the west' have been flying bot's for a few years now, both built up and arf and they all fly very well.  the arf's are a little heavier so penetrate better in a decent breeze.  the b/u's will float forever in very light air.  the arf fuse is fiberglass and is quiet weak around the wing seat, b/u fuse is a very solid affair.  arf's have a 3-piece wing, good for storage, b/u's 2-piece wing is a fairly complex build.  i put airbrakes in both types, simple operation in the b/u's, a bit of a headache in the arf's.   flying both types is very enjoyable especially with that distinctive wing plan.  in light lift on a sunny day.....magic!     hope this helps denis and  iv'e not been too long winded, best of luck.  ps, all of the above is my own opinion on the bot

DennisZ:
Thanks for your comments lads.

Now - servos:

I do not really know which to choose  :oops:
one thing I learned - plastic gears break, regardless whether they were cheap or branded (Futaba).

I'm currently looking at these http://www.brchobbies.co.uk/?page=shop&action=additem&item=154
... any advice here (keeping cost for six within 150 pounds) ?

Thanks.

billscottni:
Dennis,
You only really need 4 metal geared servo's. The rudder and elevator should be fine without metal gears, as they don't get the impact loads the flaps and ailerons can. (MUST remember to put Crow brakes away BEFORE landing!  :!: )

Happy Days:
Yes, I’ve also found out the hard way that plastic gears shear, Dennis. Although some plastic gears are stronger than others.

Although metal gears are stronger, I’ve found they also wear more quickly, so you get slack in the gears allowing the control surface to flutter. :!:

I’ve not found a perfect answer yet. It’ll be interested to see what ideas anyone else has on this matter. :?:

Keith

Fred:
Hi,

My last plastic gears servos on a glider was for my DG1000, 10 years ago !  :P
First flight, all the servos were GWS I can't remember what, but good ones, all plastic gears.
First flight, first landing (slightly rough, first flight!...That's my excuse anyway!) and I had to change the gears for 4 servos ! Never had issues with planes etc, but gliders, they just kill plastic gears much more easily!

All that to say, if possible, put metal gears all around, you can find really cheap and good ones these days. Don't know the TP90 though, but as Keith said, the problem with metal gear, is that they tend to be less precise, or become less precise on the neutral with time (steel on steel friction, wear quicker), but I don't think it's a real worry unless you do F3F contest, DS and all that sort of silly things. I have some MG servos for 13~14 years for the oldest ones (GWS 2BB MG), and no real issues.
A bit more expensive, are the Hitec with Carbonite gears, supposed to be as strong as the MG ones, but stay precise with time...

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