".90" Motor thread

[MrMel]

It seems there is a shortage of good ".90" sized motors out there today, neu backlog is from here to other side of the world.... actros are hard to get as well.

So whats our options out there? Please fill in anything you tried or have heard about other that have tried.

(Not necessary on Ion, but since thats pretty much only .90 sized out there, Im posting here)

12s motors ive tried
Actro 32-3 - Good allround motor.
Actro 32-4 - Very poor performance compared to 32-3.
Neu 1915/1.5Y - Good power, runs a bit hot, secure the shaft
LRK 430.35 (Revolution edition) - Never got this to run good, dont know why, pain in the ... to fit due to special mount.

Want to try on 12s:
Neu 1521 - Want to try, a little afraid of gearing on 12s though (> 20:1)
Z70 motors - Was alot talk about them but they never made it or?


Sidenote:
I know some say 5mm shafted motors are too weak for 12s, but Ive never ever broke one because of 12s, as long as you make sure evertything runs true I havent had any issue with them.

So what else is out there?

[chopperben1]

I can't say from direct experience if these are any good, but my next heli will be a .90 size electric, and I came across this one doing some research:

"The new HP370/40/A2 Heli is specifically designed for large Helicopters like Joker II or Fury Ion and will perform full 3-D. It comes equipped with integral fan and cooling ribs for highest efficiency. Tested on heli of over 12lbs and rotor dia. of 1500 - 1600 mm it is the perfect 3D setup with the Schulze fut. 40-160K esc."

[Mr. Ben]

Fredrick,
You mention an Actro 32-2. I didn't know such a wind existed. What is the Kv? Sounds like something I might try. I have had a Neu ordered since last august, and it ain't here yet! I spoke with Lucien yesterday at the phoenix FF, and he said Scorpion is making some 700 size heli motors, but not due untill July. Rats. I'm now flying two Actro 32-3's
Ben

[MrMel]

You mention an Actro 32-2. I didn't know such a wind existed. What is the Kv? Sounds like something I might try


Oops, name was 32-4
415kv, note the comment next to it though, no fun to fly 3D with it.

[MrMel]

HP370/40/A2 Heli

Thats quite an "old" motor from Plettenberg not sure if it can hold up to todays standard & batteries. Talks was it was running too hot already a few years back, if you ran it on 12s.

Anyone here that have tried it?

[Chachin]

Hello Mr. Mel, what about the C50-15XL.. :D LOL! Well actually the motor did ok on 10S but expect a short life span.

I ran the 1521/1.5Y on 10S for a while without trouble. Now I'm flying it on 12S and the performance is excellent so far. It stays surprisingly cool (130's to 140's). As you point out, the only inconvenience is the tall gearing necessary for 12S. I'm running 21.56:1 in my X2 right now. If you go this route, you may want to do as I did and go with the large 100t main gear and 17t motor pulley which is easier on the belt than the 16t.

Another option is the lower Kv 1521/2Y that TomC is using in his 15S Ion, although the bearings failed early on that one. Hopefully this has been addressed by now.

I'm looking to try an Actro32-3 (6mm shaft) next myself for comparison. It should work out better with less gear weight. Would like to see how its temps (and power) compare to the Neu. Can't wait to see what Scorpion comes out with for the .90 size machines.

Chachin..

[TomC]

Chachin,

Ya, that Hacker C50-15xl motor was, at best, a 60 sized motor and when you tried to run it as a 90, it fried pretty quickly. I went through 2 of them, ~50 flights each.

I really like my 10s Single Staged Ion-x, 10:1 ratio, Actro 32-3. Now that I've doubled up the bottom motor mount, this extra stiffness seems to have greatly reduced any main gear wear. I'm almost confident enough to try an Actro 32-4 on 15s with this SS set-up. Now if I could only find a cheap second hand Actro 32-4 (hint-hint!).

My 10s, 20:1 ratio Ion-x w/Neu 1521/1.5f always worked very well but did not seem to have the same power as the SS Actro set-up. Probably because it was ~1 lb heavier.

My 15s Neu 1521/2y motor, 22:1 ratio was ballistic, for about 15 flights and then the bearings failed. I've been waiting almost 3 months now for it to be fixed and returned. To compound the problem, I bought it through Diversity models and they are now no longer a distributor for NeuMotor.

Like Mel, I hope we see some reasonably priced Z70 motors out in the future.

Cheers,
Tom C

[MrMel]

I "shoehorned" a 1521/1.5Y into my E-Stratus and running 16/40 belt, I gonna see how long it lasts :)

Either it hold, or the belt or bearings will fail, its a trial since I couldnt get hold of any other good motor atm.

One thing after a quick test in the backyard, it has power, thats for sure (12s 5000 packs).

[MrMel]

having a closer look I would say its no chance in h.ll that the bearings can take that kind of beating, the shaft in the motor flexes alot just by pushing the belt.

However, since its a E-stratus and I have some CF above to mount stuff in, voila, gonna build a third support bearing from some old Ion-X parts.

[Mr. Ben]

Fredrik,
I think the bearing is the right thing to do. I build from scratch and always use a support bearing (usually 10x19x4) for the other end of the pinion. I use pinions from the Raptor 90's as they are threaded at the top, which captures the bearing ID. Motors for 700 size heli's need shafts that are at least 6mm.

Ben

[cgbole]

I'm helping a buddy of mine do a belt drive on a std ion-x. we're going to give a scorpion 4025-10 (515Kv)
a try on it on 10s first and see how it acts. They are supposed to be producing a heli version of these size motors in the near future. we have the pulleys and a belt coming from Ron's and should be getting the motor in a week or so. here is a link to some info on it...
http://www.innov8tivedesigns.com/product_info.php?cPath=21_25_39&products_id=213
it comes with a 6mm shaft but as per AlBig we'll do a little modifying to it first...
http://www.rcgroups.com/forums/showpost.php?p=8888465&postcount=1
chuck

[MrMel]

MrBen, When you say you are using Raptor 90 pinions, how do you attach them to the shaft?

[Mr. Ben]

Fredrik,
I machine a piece of steel to about the dia of the pinion OD, and about the same length as the threaded section of the bottom of the pinion. With this running straight in the lathe, I bore it to the thread minor dia and thread it for the pinion. I then releave the thread to accept the boss on the pinion. If you look at a Raptor pinion, this becomes clear. I ground the 8mm shaft on the actro to 7mm, and bored the pinion to 7mm. screw the pinion on to the adapter (locktite) and then drill and tap for couple of set screws. They run very true ( less than 0.001"). I then make a bearing block to support the top of the pinion. Works good for me, and the big pinion bearing takes the bending load off the motor bearings.
Ben

[Stan C]

I'm using a 32-3 w/8mm shaft in my X2 and bored out the pulley, hopefully it will hold up.

Stan