Metal crown gear set

[Oat Insane]

Originally Posted by SveinPedersen

Looks great but: Do we need to lubricate since it's metal to metal?
Why has'nt Kasama advertised this news we all have been waiting for?

Svein¨
Norway

I put a tad of clear Tri-Flow grease on mine.

He is a bit busy with Gov. project but should be up on his site very soon.

[thefrog]

Originally Posted by rchelijc

From the few crashes I've had, my crown has remained intact while the output shaft, hub, and tail blades were gone.

I have a feeling that when your mesh is set correctly, then when the crown strips more than likely your TT would go first. And a few bearings..

Since the TT twisting / breaking off would absorb most of the shock, I'm thinking that nothing else would be affected differently if a metal crown was used.

Key here is "mesh bedded and set perfectly" and crash involving tail strike.

I guess I'll probably have to crash it first before I can be sure, but crashes are just so random: some of them you think you'd total it but everything survives except for a few. Some crashes you think aren't even classed as a crash, but then you find bolts twisted, shafts bent, and weird parts you never think you need replacing are warped, blades cracked at the root...

But consider the other side of the fence: people who wouldn't have crashed in a particular flight, but did because of the crown stripping? This metal gear would address that... but unfortunately not for what happens if you did crash for other reasons

What do you think?

I don't suppose we'll know until a few people have binned them. Personally I'm still on the original torque tube in my Srimok (Faifa hasn't been in yet) despite snapping the boom clean in two, breaking a few crown gears and going through some tail blades after bad autos.

[trillian]

Originally Posted by thefrog

I don't suppose we'll know until a few people have binned them. Personally I'm still on the original torque tube in my Srimok (Faifa hasn't been in yet) despite snapping the boom clean in two, breaking a few crown gears and going through some tail blades after bad autos.

I had my boom snap in two and the TT was still OK. The crown gear did get stripped.

Basically, in a crash all bets are off, there's just no telling. So the main point is just don't crash :-) For now I'm keeping the stock gear on until I see evidence of a problem and then I think I'd move over to the more sturdy synthetic gear before feeling the need to go all metal.

[realloser]

I have now "upgraded" my Dune and one of my Srimok with the metall crown gear amd the sound has improved. It sounds now more like tiny bells are rinnging but not that loud. In generell I like the enhancement.
What I dont like is that I have to set the adjustment screw to the max and I still have a "big" gap betwen the helical pinion and the crowngear. I can imagine that the sound would be better if I could better adjust the space for the pinion.

Any similar experiance?

[Oat Insane]

realloser,

For Dune. You can unscrew the crown gear hub and turn the hub clockwise just a bit but not too much then you can tighten a screw back on and now the gap should be better. After that it will be little play between Main gear case(KSM10-50TS01) and a Top lock clamp(KSM10-50TS05). So you have to moveTop lock clamp(KSM10-50TS05) and Lower main bearing block (KSM10-TS03) down so will be no play between them. Sorry I am not good at explaining.

[Stallion]

i am really happy that there are some developments on the faifa front! i will order it. But is there any news on the slanted main gear and pinion set??? I think most of the noise is coming from the main gear! On my field i am the only one with a Kasama and it is known as a screamer! ;-)

[rchelijc]

Got these installed.. These gears are machined to perfection.. You can run them so close there won't even be a rise in noise or vibes.

For lube, I went with dry lube like ceramic lube or bicycle chain ceramic lube. Won't pick up dust.

[Stallion]

@rchelijc do you mean only the metal tail drive gear or the slanted main gear as well?

[rchelijc]

Both crown and the paired pinion. I Just apply and spin by hand slowly until it dries. Then repeat 4-5 times.

[wadders248]

Hurrah, Kasama UK has just had a new stock shipment and so I've got a new delivery :-)

[trillian]

Just curious, has anyone used Dry Fluid gear lube on these metal gears?

Also, do you notice the difference in drag when spinning the drivetrain by hand? Presumably there must be at least a tiny energy penalty in having more surface engagement.

[wadders248]

Originally Posted by trillian

Just curious, has anyone used Dry Fluid gear lube on these metal gears?

Also, do you notice the difference in drag when spinning the drivetrain by hand? Presumably there must be at least a tiny energy penalty in having more surface engagement.

I'm going to be running Dry Fluid on them, it feels great on other helis gears I've added it to. The engagement feels super smooth, so as long as the gears spin true they should be better than the straight cut teeth. The old pinion and crown have more engagement, as the pinion length is almost double.

[wadders248]

Well I couldn't just sit and look at the new gears forever. I also cleaned the main hear and pinion to use DryFluid on everything... my fingers are fooking sore.

As soon as the DryLube was ready I spooled-up without main blades and it's super schmoooooooth and very quiet.

One other thing to mention is that the new metal set is a lower ratio. So for you Trillian it might not be as good for low head speeds, but the existing crown is fine at low head speeds anyway. Where a lower ratio is a big benefit is for the more current higher head speeds. With the previous crown I really had to get my tail balanced to be able to run my 800 at 1,900rpm and 115mm tail blades, so that I didn't get any humming or vibes. It's perfect now :-)

[jiminator]

Those gears look great.

[Oat Insane]

Very NICE Paul.

[wadders248]

Adding the new crown set and cleaning the main, so it's pearly white make it feel like a new heli :-)

I had a quick flight with the new gears yesterday and really does transform the sound of the Faifa, it's so much better without the crown whining noise. There's just the odd ringing noise of the metal gears.

The only down-side is that it's a lower ratio, so the tail didn't hold as well at lower rpm, I'll need to see if upping the gov gains will help.

[P@reez]

Ben, do you have any metal crown and pinion gears in stock? I stripped my plastic crown gear today, so wouldn't mind trying the metal ones out.
Thanks.

[BenScoobert]

Our latest shipment left the factory on Wednesday, so before next weekend we should have them, but it's all down to customs speediness.

[P@reez]

OK. I guess I have to wait. Having withdrawal symptoms already

[BenScoobert]

Originally Posted by P@reez

OK. I guess I have to wait. Having withdrawal symptoms already

Shipment landed, mostly, some kits stuck in customs, rest is on the site now.