I have the Ruedi's electric conversion on my EXIII.
If using 95T main gear and 10T pinion gear, you need to slot the top bearing mounting holes on the top carbon frame and the motor mount holes at the bottom carbon frame so that you can adjust gear mesh.

Failure to do so will result quickly in main gear failure.

I have no problem with Ruedi's pinion gear adaptor and I like the way that the top of the pinion gear is supported by the top bearing block.

The selling price of Ruedi's electric conversion is reasonable if you do not like the trouble of machining and fiddling with the setup. At this moment, this is probably the quickest way to do an electric conversion and get back to flying soon.

thanks yapjy , that was helpful

Machine over Gravity

I would concur. Even with its stiff price, Ruedi pretty well assured me that the quality was unquestioned. It was all too clear that he went through the frustrations of substandard outsourced machining before biting the bullet and having it done in Germany. As I was putting in my conversion and fighting the substandard machining QC, I was once again reminded why OEM Hirobo parts or Ruedi's stuff cost a bit more. It's because they FIT!!!

Ben Minor

Team Thunder Tiger Team Futaba Team Kontronik USA
Esprit Models Progressive RC Wildcat Cells

Just my bit of information on e-conversions.

I learned this when developing the conversion of the Dyna X which also uses a very high quality main gear. I did it for 3D and really abused it on both 10 and 12S.

Concerning gearing my experience was that if you decide headspeed rpm, and then use the following rough rule to estimate requied KV you will be ok:
KV=0.8*rpm*gearing/(NumberOfCells*3.6)
You can use 0.7 instead of 0.8 if you want to have more 'power-margin', but you will hardly need it.

First I used 10S with Actro 32-3HeliMax. It was perfect setup with no problems at all really. The Jazz 55-10-32 was sufficient and truly nice. I did not use any top bearing on then piniion since it limited the available pinion choices I had. No main gears were stripped in flight. But take care, when you crash the huge inertia of the motor has no clutch to save anything and damage will be high

Then I changed to 12S and had to change pinion since I was going for same head speed. In short time I broke 2 motorshafts (5mm version). Motor manufacturer assured me a top bearing would not have made any difference. Then I changed to 8mm shaft and that fixed it. Unfortunately after short time the pinion broke due to too thin walls with my number of teeth
I also changed to Castle Creations which did have huge problems in hover rpm. It ran more rough than a bad adjusted nitro After the latest SW update this has all changed. It is as smooth as the Jazz.

Finally I changed to Scorpion which use 6mm shaft, and since then no issues. I estimate power range to be very similar, but the Actro cetainly did run more cold. If the reason is efficiency or cooling I do not know.

I doubt top bearing is required when using quality main gear and stiff motor mount, and if it limits pinion choices one could start without bearing.

http://www.ercmarket.com do offer many pinions. Check it out if you have a hard time finding something suitable for some specific application. Quality wise I have not been dissapointed, but on the other hand I am pretty certain Rudiger is your guy if you want to get the best of the best.

I'm a model heli pilot, If you see me run please try to keep up!

Kaj,
is this right link? I can't find any pinions with this link which guide through rc universe.

At some point it becomes your lifestyle

oops, my typo, my mistake
Try http://www.ercmarket.com choose 'Shop' in upper right corner and then choose pinions.
Sorry.

If you do not find what you need drop Alex a mail. He can be a wizard with those things.

I'm a model heli pilot, If you see me run please try to keep up!

+1

Deal with Alex directly for small, few piece items like pinions to avoid the minimum order requirement on his website. He responds immediately to email, and you can pay directly with PP. I had my pinion in less than 7D to the US from the EU.

I'm using a "Crown Gear" (FKA "Revco" pinion. The fit on the 6mm shaft of my motor is acceptable.

This is not the first time I'v heard or read of 5mm motor shafts breaking. It doesn't surprise me, though. Where in any other aspect of our sport would you seriously consider transferring the better part of 6 hp through a 5mm shaft?

My installation is seriously stiff. The top of the pinion is just barely above the top of the maingear, just mm below the original top bearing block, and the bottom of the pinion is barely 6mm above the motor's top shaft bearing. The precision cut of Hirobo maingear allows for setting of the mesh very tight with just a touch of backlash and yet with no adverse drag or gear wear. No "wearing in the high spot" with their gears .

Ben

Team Thunder Tiger Team Futaba Team Kontronik USA
Esprit Models Progressive RC Wildcat Cells

Please Dr Ben, give some photos now

Yeah, yeah......

Next week. I backtracked a little after I decided to use a carbon baseplate to mount the batteries.

Ben

Team Thunder Tiger Team Futaba Team Kontronik USA
Esprit Models Progressive RC Wildcat Cells

This has been a fantastic thread.

Can some one mention the difference between.

"12T pinion from the FREYA " and " 12T pinion from Eagle 3"

?

Thanks,
Puneet

Machine over Gravity

Puneet,

It's kind of hard to explain in words, but basically, with the Freya series, Hirobo plays with the size of the teeth on the pinion to allow fitting of 10-12 tooth variants with the same bell/maingear spacing. With the E3, Hirobo optimized the teeth of the pinion for the 12t pinion only for best engagement and set the bell-to-maingear spacing for that gear alone. In doing this, the pinion gear itself ends up being a bit larger. Thus with the Eagles, when you try to fit either a 10 or 11t Freya bell, the mesh ends up way too loose.

Clearer?

Ben

Team Thunder Tiger Team Futaba Team Kontronik USA
Esprit Models Progressive RC Wildcat Cells

Alright this thing is getting very tricky.

Now any users may ask this question( and I also have same)

a)What pinion do I use so that I remain like Freya spacing ?

b) What pinion I use so that i remain like Eagle spacing ?

Both questions are for Mod1 pinion commercially available choices to be installed on motor ( not hirobo pinions )

Thanks
Puneet

Machine over Gravity

I forget....which mechanic are you planning on using, and what gear ratio?

Ben

Team Thunder Tiger Team Futaba Team Kontronik USA
Esprit Models Progressive RC Wildcat Cells

If you can only use the 12T pinion, using a 95T main gear will give you a 7.92 gear ratio.

This should be fine if using 560KV motor and 10S lipo.

I don't think the performance will be very different compared to a 12S setup.

The only problem is that reasonably priced 10S 6000mah lipo is difficult to come by.

Is that true that 5000 10S with model at weight 5400 is not enough to fly whole schedule?

At some point it becomes your lifestyle

The "numbers" I heard last season with a 10S set up had guys putting back close to 5000 maH's after a C schedule flight with 10S, though some posts here showed much better efficiency. It was for this reason that I so zealously supported a rules change to 12S in AMA class competition to mirror the FAI rule. It's just plain more efficient and packs are more affordable.

Ben Minor

Team Thunder Tiger Team Futaba Team Kontronik USA
Esprit Models Progressive RC Wildcat Cells

Teaser pics

Sorry for the delay in the pics. See; the model really does exist. There was a SNAFU with the accuracy of the carbon baseplate, but everything else is done. I'll have a recut plate next week for flying next weekend. I'll post more pics when it's up on skids.

Ben

Team Thunder Tiger Team Futaba Team Kontronik USA
Esprit Models Progressive RC Wildcat Cells

Thanks!
Looks very nice. What is the radiator at the front of the airframe?

At some point it becomes your lifestyle

What do you use the metal ruler with the holes in?

Hirobo XSpec EVO
Hirobo SDX
Futaba 12Z FASST

I wanna know what all those Q-Tips are for??

Looking good Ben. Can't wait to see/hear that bird in action...

Erich