using MD600 helical 110 M1 main gear

[sambest]

check this videos...the 110T M1 main gear sound is more silent...

[ame]http://www.youtube.com/watch?v=skiuQ6abbNw&feature=player_embedded[/ame]
h

明達科技MD人形齒V2 for 700E測試 (3 min 1 sec)

[ame]http://www.youtube.com/watch?v=22SBk5Oxu8w&feature=player[/ame]

[CNCjunkie]

Where are these main gears sold?

[NTM]

Why not use the align slant cut gears, which seem to be holding up very well ?

[CNCjunkie]

The herring bone design is stronger, quieter and doesn't put any axial loads on the motor bearings.

Mikado has been using this proven design for a while now.

[Helipsyko]

Found this in another thread

herringbone main gear $10 http://www.topshop.com.tw/md-rc-en/p...1-74F015BA80DE
12T 6mm pinion $16 http://www.topshop.com.tw/md-rc-en/p...5-26DA86032CFC

[NTM]

Originally Posted by CNCjunkie

The herring bone design is stronger, quieter and doesn't put any axial loads on the motor bearings.

Mikado has been using this proven design for a while now.

Oh I know, I have quite a few of them.
But something that's critical with the herringbone pattern is gear alignment and vertical runout in the main gear.
The 700e strips gears primarily because the frame is quite flexible between the motor and the mainshaft, when the heli sees a hard cyclic load and a hard collective load, the frame twists right there. The gyroscopic forces of the motor also play a role, and I suspect that's why the tall kde/neu motors are particularly bad for gear stripping.
When the frame twists the gears go out of alignment and the motors force is routed through a very small contact area on the gear face = gear stripped.
Herringbone's are sensitive to the same kind of thing, if the gear gets misaligned in any way, all power is routed through just one side or the other of the herringbone pattern, which usually results in a stripped herringbone gear.
This used to happen alot before folks learned to take a bit more care setting them up on the logo's.
I think the 700e's flexy frame is still going to allow the herringbones to misalign and strip.
I think the reason the align slant gears are working so well is that the axial load they induce is actually helping to keep the pinion and main gear aligned properly when the frame is trying to flex !

[Mystic3D]

Originally Posted by NTM

Oh I know, I have quite a few of them.
But something that's critical with the herringbone pattern is gear alignment and vertical runout in the main gear.
The 700e strips gears primarily because the frame is quite flexible between the motor and the mainshaft, when the heli sees a hard cyclic load and a hard collective load, the frame twists right there. The gyroscopic forces of the motor also play a role, and I suspect that's why the tall kde/neu motors are particularly bad for gear stripping.
When the frame twists the gears go out of alignment and the motors force is routed through a very small contact area on the gear face = gear stripped.
Herringbone's are sensitive to the same kind of thing, if the gear gets misaligned in any way, all power is routed through just one side or the other of the herringbone pattern, which usually results in a stripped herringbone gear.
This used to happen alot before folks learned to take a bit more care setting them up on the logo's.
I think the 700e's flexy frame is still going to allow the herringbones to misalign and strip.
I think the reason the align slant gears are working so well is that the axial load they induce is actually helping to keep the pinion and main gear aligned properly when the frame is trying to flex !

Agree on the analysis. Why I see 3rd bearing block as critical..

[rotaryguy]

Finally! I can't wait to try this. Do the mikado pinions mesh properly?

[CNCjunkie]

Thanks for the info NTM.

It's always an educational experience in here.

I've ordered the CHP RES frames and the frame supports, which I hope along with the 3rd bearing block will eliminate most or all of the dreaded frame flex in the 700e. So maybe this will be a better platform for the herring bone main gear. If not, I do have the helical cut gear and pinion in my stock pile of parts.

Your thoughts NTM?

[NTM]

Go for it, never know unless you try.

I'm building the res frames from chp right now, the elevator servo links are 60mm center to center, so a 45-46mm rod works well. The stock aileron bellcrank to swash rods are about right.
The bellcranks require another shim on each side as the flanged bearings sit closer to the frame too.
The frame is much stiffer than the stock align frame, especially with the 3rd bearing block and the frame stiffeners on there.
And the battery tray setup rocks !

[keepnitflying]

I finally found them here: http://rcehobby.com/index.php?cPath=2_89_92

Have not received them yet so I cannot vouch for the shop or the quality of the gears....yet.

[keepnitflying]

I'll post more when I get them installed and give them a good beating.

When I say beating I mean 1917 1Y with 710CY blades and CC 160hv gov gain past 16

Will be testing on a 700ec with KDE pinion support, third bearing block, and a lot of extra frame bracing.

[CNCjunkie]

ok, thanks guys. Now I'm super stoked about installing the CHP frames. I have a Scorpion 4525 Ltd I want to try out.

[504Rone]

It look pretty beefy!

[sambest]

actually i put it on my trex600esp stretch to 700 so need some modification to fit it..
tested with hard smack once with excellent result no strip and the sound is a bit reduced..
the main gear&pinion have good quality of materials but the pinion is short compared to scorpion M1

[Mystic3D]

Originally Posted by CNCjunkie

ok, thanks guys. Now I'm super stoked about installing the CHP frames. I have a Scorpion 4525 Ltd I want to try out.

The 4525 is wayyyyy too powerful, suggest you send my way so I can do some testing before you hurt yourself...

[CNCjunkie]

The 4525 is wayyyyy too powerful, suggest you send my way so I can do some testing before you hurt yourself...

Is there really such a thing as too powerful?

I have 2 of these motors and one is going into a Logo600se with the CF frames. This is just going to tie me over until the Logo700 is available...

[keepnitflying]

I see how you could make do with that, well for a little while anyways.


That frame is a work of art

[f22warzone]

Originally Posted by CNCjunkie

Is there really such a thing as too powerful?
.........

Yes their is, custom wound 5035's : ) well maybe, if my bird ever gets put back together..... i did manage to get the motor in, let me tell you it looks beastly weighs a bit more then the kde 1917

[keepnitflying]

Props on winding one.
I've been kicking that idea around for some time now.
Gonna build a new heli this summer. May have to have a look at powercroco.
Nothing like being able to change the kv when you want.