Pinion size

[hydev]

Hi,

Forgive my ignorance but why does MSH offer pinions ranging from 14t to 20t? What are the advantages? I currently run a 6S 15t setup but only because that's what came out of the box, never really thought about it till now.

Any help greatly appreciated

Mike.

[OnTheSnap]

It allows you to run a lower cell count if you wish. You have the flexibility to run from 4-6s on the Protos. Or you may choose to run an A123 setup which requires a larger gear depending on the cell count and desired head speed.

I run 14T on 6s gov'd and it's a very efficient rocket.

[popokatepetl]

...or you can use diferent motors.

btw the range is much wider: 12T - 20T

[nessie]

6S / 12 T / 2500 rpm / jazz 55 governed @ 80% / stock msh motor
happy with that

[popokatepetl]

6S / 12 T / 2500 rpm / jazz 55 governed @ 80%
happy with that
...you have to say what motor do you have

[dodgey]

Also bear in mind by going down pinion sizes on 6s you can reduce the headspeed to what sport flyers like myself are happy with and take the load off the esc by running at 100%. I'm on the 13T, 6s, 100% - and it's still scarily powerful, and I get 9.5 minute flights.

[scoio]

9.6 minutes:shock: witch HS??

[dodgey]

Can't remember, would have to tach it again. I'm running a 6s 3000Mah. I know when I set it up my HS was nice and fast. I don't every remember bogging it down.

It has insane power as it is :-) I think a lot of non 3D flyers need some convincing to use the 13T with 3000Mah. For me, it's a delightful combo.

9.5 mins sport flying (takes back about 2600Mah), down to about 7.5 mins if I start flipping and looping and generally stressing the bird.

edit: Had a quick play with a HeadSpeed calc program and it tells me I have a loaded headspeed (at 4v/cell) of 2250 (which rings a bell). It also tells me I dumped 350rpm by going from a 15T to 13T.

More importantly to me, I'm running at 100% throttle so the ESC is doing very little. On the 15T I ran at 80% to get the HS down to levels I'm happy with and then the ESC got too hot.

For me , 6S 15T HS is insane and alarming! :-)

p.s. the Specs on the MSH site say "Lightweight: 2600Mah, 2400rpm HS, 10 mins - which kind of makes sense - that setup is a fair bit lighter than mine , with 200 more rpm. I imagine theri lipo was pretty flat after that though! I have more weight but a much lower HS.

p.p.s - I spoke about small pinions on the Protos to someone else the other day who was equally curious, so, when the rain stops here in Italy I'm going to make a 1 minute video with spool up, take off, power climb , power turn, and a flip or two - just so people know what running the smaller pinion on 6s actually looks like. It seems a fair few like me find the stock setup a little overwhealming !

[hydev]

thanks for the replies, I'm getting the idea now. As I currently run 6S on 15T it is fairly insane and I am learning 3D, at the moment I'm on tic-tocs and inverted etc.. Therefore I'm guessing I should probably leave it at this. However I would like more air-time so if I drop to a 14T would that do it?

btw - which head speed calculator do you use?

[JustPlaneChris]

I advise dropping to the 14T pinion. Your batteries and ESC will thank you! The Protos will fly great on lower headspeed, and learning 3D at a lower headspeed actually teaches you collective management (a great skill to have) too. :)