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ProModeler Scorpion Power
martinhung

Senior Heliman

Hong Kong

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I have a masterpiece - Hirobo Eagle 3 WC VPUS version.

I want to conversion into 12s and already bought the scropion motor mount but in 25mm version not 30mm.

I would like to ask anyone using this motor mount (25mm) and what is the suggested motor?

or What is the suggested rpm for Eagle 3 WC? the gear ratio and which motor suggested to use?

Thank you for any advice.

Best Regards,

I am nobody, but a RC heli freak

09-26-2016 08:31 AM
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Jamovich

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Mumbai, India

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09-26-2016 08:46 AM
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Jamovich

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Mumbai, India

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But you cannot change the gear ratio on the eagle 3 "VPUS" from the standard 7.92 because the bearing block has only 1 position and is part of the VPUS internal structure. I think you can change the ratio on the newer eagle 3 WC kits only

Stick to nitro as this masterpiece is meant to be left alone. Or if don't mind drilling you can try the os 15 gt hz as that engine is good enough for FAI flying...but you cannot do hard 3D with that (anyway the eagle 3 is not designed for that)

09-26-2016 08:49 AM
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martinhung

Senior Heliman

Hong Kong

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Thanks Jamovich. In fact, I have 2 Eagle 3 WC. Thus, I will keep one in nitro and want to change another to electric for 12s.

As far as I know, the original main gear is 95T and 12T. The main gear cannot change, but the motro gear can change to 11T? the parts number is 0307-011?

Thus gear ratio change from 7.92 to 8.63.

The motor now I need to choose is 450KV for 12s? or what rpm is suitable? 2000? or 2200?

I am nobody, but a RC heli freak

09-26-2016 09:26 AM
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Jamovich

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Mumbai, India

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Hi

No you cannot change the pinion gear on the eagle 3 WC VPUS from 12T to 11T. Now Im referring to the original 2003 version which I have.

You cannot reverse the bearing block above the pinion gear because it is a fixed part of the VPUS structure so your gears will not mesh properly if you try to do that.

However I think you can change the pinion gear on the non-VPUS Eagle 3 WC by reversing the bearing block that sits over it.

Also 2000 RPM on a FAI machine just might be overkill too! I assume hard 3D on this machine might end up you chopping the tail off...

...again I have the original version with the SSR-7 head (0414-915 Eagle3 WC VPUS with SSR-VII, shaft drive, 2003)

You should write to petiteway as he seems to have done an E-conversion for the version I have. He might be able to help you with this

09-26-2016 11:47 AM
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Bugcatcher

Senior Heliman

Perth, Australia

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It may also be possible to use a 97T main gear against the 11T pinion to compensate for the additional backlash of the smaller pinion.

Not tried it myself and not sure if it will work but may be worth a try.

Target headspeed for F3C or sport flying should be around the 1950HS.

Try to get a motor with a kV rating to match at approx 80% throttle.

10-02-2016 01:59 PM
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Jamovich

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Mumbai, India

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1950 HS is well, well above what is needed for sport flying or for F3C circa 2003 which consists of mainly aerobatic maneuvers vs 3D ones

You cannot change the ratio on the Eagle 3 VPUS period. There have been long discussions on this limitation on this forum and I have experimented with this.

10-02-2016 08:24 PM
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Bugcatcher

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Perth, Australia

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I guess it's all personal opinion but to me 1950 is a good target headspeed whether F3C/sport or 3D. Martin has not even mentioned what type of flying he intends to do anyway though I doubt 3D would even be considered for this heli. Whether F3C 2003 or F3C 2016, doesn't matter, you can still fly the maneuvers with this.
Even if you where to run a lower 1850HS you still need the headroom if you wanted to raise the HS a little afterwards.

I'm surprised you can't change ratio's on this heli at all. I understand that the bearing blocks are fixed. Nitro's usually have a lot of backlash to start with so you do have a bit of room to play with there. So having a slightly smaller pinion against a slightly larger main gear I would have thought may have worked. The trick really is that ideally you need to set the backlash correctly on an electric heli as it is more prone to stripping than a nitro. And this heli does not allow that so the pinion/main gear needs to match correctly.

Jamovich, have you tried using the 11T/97T combination yourself previously?

10-03-2016 04:02 AM
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Bugcatcher

Senior Heliman

Perth, Australia

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Just as quick follow up.

I worked out the 11T is 0.5mm smaller in radius than the 12T. And the 97T main gear 1mm larger in radius than the 95T.

So for it to work it really comes down to how much backlash there is already with the nitro setup to see whether there is enough clearance for the 0.5mm difference.

10-03-2016 04:16 AM
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martinhung

Senior Heliman

Hong Kong

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For some basic 3C fly and inverted hovering only. I guess 1950 Headspeed is enough.

For the gear ratio, I have both pyro 700-45 and Pyro 700-52.

The main gear is 95T, this cannot be changed. Thus I need to find out the motor gear which can match with the 450kv and 520kv.

Original Engine gear is 12T, by using 450kv, I need 11T and for 520kv motor, I need 9T?

I am nobody, but a RC heli freak

10-03-2016 08:38 AM
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Bugcatcher

Senior Heliman

Perth, Australia

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By going a smaller motor pinion, you will just increase the amount of play or backlash between the motor pinion and main gear. This will likely cause the main gear to strip under any significant load especially for an electric. So I would not recommend that.

You should be able to use the 450kV motor with the stock gear ratio. I work out you should get about 2020 HS at 80% with that combo which will be fine. Definitely in the working window.

I am running my nitro D3 both V1 & V2 at 1950 HS for hard 3D so it won't be a problem. It's only modern hard core pilots that are pushing the limits running 2100+

10-03-2016 12:41 PM
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