Kyosho MMR on 8 cells

[Olivier]

Hello there,

I would like to replace my Ikarus standard motor with a Kyosho MMR.

Do you think it will work on 8 cells, if yes, with which pinion ?

What can I expect from this motor on 8 cells ?

I'm only hovering, I don't need a 3D type flight for the moment...

Thanks

[Richard Fry]

I flew mine the other day on 8 cells, I've only ever had the 10t pinnion and it flew very well - no aerobatics, but plenty for flying around, should get about 8 mins.

I usually have 10 cells which gives better performance in winds, but given the right conditions the reduction in weight can work for you.

I would install ballraces in your motor if you haven't already - will extend the life dramatically.

[Olivier]

Hi,

I think I'll go for a try with a Kyosho MMR...

I already burned a ikarus standard motor (front bushing) and I find them expensive !

How do you add ballraces on these motors, do you find them easily ?

[Richard Fry]

Dead easy to add ballraces to these motors, I was a bit worried the first time, but once you've done it, you wonder what all the fuss is about.

Firstly, mark the case and can so you can identify which way around the motor goes back together.
Remove the brushes and springs, and punch out the rear case end (the easiest way to do this is to 'bang' the shaft down on a piece of wood - the end will fall out and as long as you don't get it crooked you can't bend anything)
Get rid of the oilite bushes by punching them with a suitably sized piece of dowling.
Fit the ballraces.
Re-assemble in reverse order (remembering to line up the marks in the casings as previous) and re-fix the 'tabs' to hold the end case in position.

Go for it - it will extend the life of your motor and improve the running (more time in the air).

[Mikey_Flies]

Where did you get the bearings from and what size were they?

[Richard Fry]

Same size as the ones that came out??!!!


Honestly don't know, I took the motor along to the Sandown exhibition in the UK, and a guy sold me some bearings (he mainly dealt with RC cars).

I believe Tower Hobbies stock them, but dont know the details, sorry.

[Olivier]

Richard,

Thanks for the idea, I already removed the bushes from my old motor...piece of cake...

It looks like this one will work again, the only damaged piece is the front bushing !

I will go in a "car specialised" hobbyshop to find those bearings !

Bye

[Sture Smidt]

Richard,

I have bought the bearing and I wonder how you disassembled the motor. The tabs that hold it toghether, do you do anything to these before disassembly? After disassembly, do you bend them before assembly? They were pretty solid and I couldnt bend them back before disassembly, so I gave up.

------------------
Sture Smidt
RC Pilot
Norway

[Olivier]

Hi Sture,

this is how I managed to remove the back of the motor:

I tried to "bend out" the two little tabs with a screwdriver (a strong one !).

Not really effective but... after a moment the backplate became a bit loose and i pushed the axis of the motor on a woodblock. Everything came out this way.

after removing the backplate you can finish the bending of the two tabs easily to ensure a clean repositioning.

To remove the bushes, use a piece of wood and a littke hammer. They'll come out easily.

Where did you find the bearings, are they expensive ? I'll go to my hobbyshop tomorrow.

[Richard Fry]

Sture,
I tried 'bending' those tabs with a couple of screwdrivers, but quickly realised that they weren't budging. I then followed the instructions given to me (bashing squarely down on a piece of wood) and the thing just 'popped' apart as easy as anything.

I 'smeared' cyano on the back just before I reassembled and bent the tabs as best I could - It's still going great today.

[Olivier]

Hello again,

I just called my hobbyshop, I'll have the bearings tomorrow...

They are "common things" for rc-car people.

the price is around 10 US$ a pair.

I'll try to put everything togeher tomorrow...and fly on saturday

bye

[Olivier]

Everything is done,

The new bearings (from LRP) are in the motor http://www.ikarus-modellbau.de/ubb/images/icons/smile.gif . They fit perfectly BUT the weather is so bad that i could not fly today...

We'll see in a couple of weeks, I have to leave Belgium for 3 weeks (work and skiing...).

Talk to you soon...