Would hs 81s be enough in A mini Graphite? - RC Groups
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Oct 09, 2005, 03:05 AM
Registered User


Would hs 81s be enough in A mini Graphite, on a b50 7s setup? 10-14 cells.

Im thinking its pushing it, any opinions?

Last edited by Philpops; Oct 09, 2005 at 08:44 AM.
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Oct 09, 2005, 04:34 AM
tic's Avatar
they would probably be fine IMHO..
Oct 09, 2005, 08:34 AM
Yogi's Avatar
I'd second that. the really small JR241's are used in Ailerons in F5B, as well as the diamond D60. so an 81 is plenty. I used them on a very fast Bandit. If you're worried, spend a little more, and get some 125s. A well known Rocketworm on this board runs D60s all around, flaps, ailerons, everything.

Oct 09, 2005, 08:37 AM
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Andy W's Avatar
I'd use MG on flaps, otherwise you might end up with broken gears if a flap catches in the grass.
Oct 09, 2005, 08:44 AM
Registered User
thats the only thing im really worried about, striping gears. what do you think about hs 85bbs on the flaps, and Jr 331s for Ailerons?
Oct 09, 2005, 08:47 AM
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Andy W's Avatar
No, the BB's still have nylon gears. I personally use HS85BB's on ailerons in my hotliners or larger sailplanes, but only metal gears on flaps (with a plastic snap-clevis on one end of the linkage)..
Oct 09, 2005, 09:41 AM
tic's Avatar
Yep, and I'd definetly second the idea of using HS-81 MG'S!!!!... Even on the ailerons. When you price an 81 MG, it's tempting to just go ahead and get the HS-125's...
Oct 09, 2005, 11:06 AM
Toy Flyer
glover's Avatar
I have 6 HS81's in my Mini Graphite slope toy, and they work great.

Lots of lift, Glover
Oct 09, 2005, 03:48 PM
Registered User
Kyri's Avatar
I used HS81's for a while in a Twister (F5B plane).

I eventually stripped one of them in a hard landing and replaced the gears with metal ones. However I wish I'd have put the MG servo in at the start because I had to cut the wing to get the servo out.
Oct 09, 2005, 03:50 PM
sloping addict
Protocooler's Avatar
Hi, I'd be the one to have 6 Dymond D60 on Raketenwurm, they withstood one major crash (behind trees, could not see the plane) with just one stripped gearset and busted fuse, and otherwise I ran about 50 packs with typically 30'+ per pack and about 3-4 landings per pack (that would be a good 150 landings) and never stripped one. The grass is just average.
I have much improved my landing skills though, coming in slow with full flaps, and there is a landing pin that helps a lot (almost no sliding).

My advice then: use whatever servo that have been mentioned, nylon is actually fine (although I use exclusively metal for larger planes), but then install a landing pin (3 mm diam / 15 mm long steel pin), if you land on grass.

If you want really good and small/light metal servos then get Futaba S3150. They're the best to date at less than 13mm thick (used in 3m F3B also = most brutal application there is...), digital also, and cheaper than Graupner DS368.
Hitecs are powerful but the metal geartrain is not too good, unfortunately.

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