32 pitch pinion?

[Slyster]

Does anyone understand what 32 pitch means?

I am still looking for an 11T pinion for my .8 mod main gear. Robinson didn't work.

http://www.hobbyetc.com/item.cgi?part_id=56440

[velocity90]

http://www.liquidrc.com/index.php?ma...ducts_id=58742

http://upload.wikimedia.org/wikipedi...Gear_words.png

I strongly advice you to choose a different kv motor and stay away from the 11t pinions.

[Slyster]

Well.. I cannot afford two new motors when I have two good Neu motors already. So I'll just live with the 12T and 60% TC on fusion gears. It is flying SO beautifully now and quiet!

My only worry is if the 60% is hard on the Jive or flight times. But then again.. it's not the same as 60% on fixed end points.

[velocity90]

Originally Posted by Slyster

Well.. I cannot afford two new motors when I have two good Neu motors already. So I'll just live with the 12T and 60% TC on fusion gears. It is flying SO beautifully now and quiet!

My only worry is if the 60% is hard on the Jive or flight times. But then again.. it's not the same as 60% on fixed end points.

Keep it that way. You saw the vbar gov topic. First I get an advice for an kv and pinion and then a post that my gearing is way off. I dont understand anymore.

You can also run the gov on the vstabi, it will be availible for the mini. IT will cost you like $12,- for the sensor, and the gearing is better for the neu.

Just realised, Kontronik No go.

[Slyster]

Thats ok. The kontronik gov is very good as you know.. I think the YGE is as good.. why aren't you just using that?

[pctomlin]

Hey Pete, found this blurb on the internet. Sounds like the 32 pitch is the standard equivilent to the .8 modulus metric.
0.8 metric pitch (compatible with 32-pitch) pinion gear

[scott s]

Sly I just crunched some numbers on the calculator. The Neu 1907 1y on the 129 gear with 12 tooth pinion with a theoretical effeciency of 90% which is very practical will yield a top rpm of 2602 at 22.2 volts nominal voltage with a 6s pack, Given these figures if your esc was only running at 60% you would only get an rpm of about 1561 so something you are figuring or your esc does not add up! Maybe this figure in the esc works something like the cc and it is an arbitray number that chooses the particular head speed you want. These numbers are conservative to real world use so It may even be LESS rpm and you can't change the laws of physics or electrical current/ voltage. Have you bothered trying fixed end points and tached and see what rpm you actualy get at different real output settings?

[Slyster]

Originally Posted by scott s

Have you bothered trying fixed end points and tached and see what rpm you actualy get at different real output settings?

no

You are right. The next fly day I will use fixed end points and get to the bottom of this... but MrMel seemed to suggest 50, 55, 60% was too love with Jive gov. I need to dig around my PM box to re-read what he said.. I'll post it here... nm... he was referring to 40% mostly I believe. I think I am just fine on 60%

[Slyster]

I just ran MrMels standard calculator.. and it gives me (fixed end points) 2891 at 100% It is a 1400kv motor.

I might try one of those pinions I linked to above.

[scott s]

The point I am trying to make is at 60% true output you would only achieve 1500 rpm head speed. I think it is an arbtrary number just like cc. It is impossible for an esc to some how increase effeciency. Or einstein, newton ,and all the others are wrong and jive is a secret weapon in disguise. LMAO!
You can;t achieve 100% effeciency ! 90% is about the best and even that is high. Stop fighting this and tack the dang thing in fixed endpoints and you will see. You are over thinking this way to muchHA!

[Slyster]

What calculator? This one shows about 1730rpm at 60% with fixed end points.. with a 2891 RPM at 100%

http://heli.dacsa.net/CalculatorV2/Default.aspx

[scott s]

And I came up with 1500 + based on output with a motor running at 90% effeciancy! no motor with blades and gear train runs at 100% efficiancy, you are giong to have loss and 90% is conservative. Still even what you are saying at 100%if your jive was actually running at 60% you would only have about 1650 rpm. Come on!

[Slyster]

I set to 90% too. But I do know the Neu is closer to 95%

Try the calculator I linked too. 1400kv, 129T, 12T, 90% efficiently

[scott s]

Originally Posted by Slyster

I set to 90% too. But I do know the Neu is closer to 95%

Try the calculator I linked too. 1400kv, 129T, 12T, 90% efficiently

I don't need to as the figure of 2602 max rpm based on 90% effeiciancy is 2862 at 100% which is just about spot on to the calc you are using!. By effieiciancy I mean actual output even when your tx says 100% your motor with gear train and blades and drag cannot achieve that 100% and 90% is conservative. You just are not getting it. And AGAIN if your jive was actualy only operating at true 60% output your headspeed would only be about 1600 rpm at 100% effiecancy. Just go to fixed endpoints and see for yourself. You NEED to run a 12 tooth pinion with the 129 gears and neu 1400kv motor! Forget the 11 period, again arbitray numbers that choose a headspeed in gov mode!

[Slyster]

OK. Next time I fly I'll try the fixed end points. You are probably right, but I will do some taching to be sure.

[scott s]

Originally Posted by Slyster

OK. Next time I fly I'll try the fixed end points. You are probably right, but I will do some taching to be sure.

sounds great!

[Slyster]

I have to wait though until my Jive comes back... I want 2 helis flying before I start testing on one. Yes Jive's fail too... not that often but I guess I am lucky. I am pretty sure one motor wire broke where it enters the Jive.

[scott s]

Originally Posted by Slyster

I have to wait though until my Jive comes back... I want 2 helis flying before I start testing on one. Yes Jive's fail too... not that often but I guess I am lucky. I am pretty sure one motor wire broke where it enters the Jive.

WHAT the ever remarkable jive fails also, no way! just kidding. I will stick with cc thanks.

[rmalt]

In r/c cars they choose gearing by the pitch but I think a 32 pitch is a .8 mod gear.

[Slyster]

found a 10T also! I may try the 11T.. but first I'll try fixed end points to be sure I even need it.

Right now at 60% I am hitting 2350RPM and MrMel suggests 80-85% will be best for the Jive and efficiency.

http://www.hobbyetc.com/item.cgi?part_id=58741