600e Pro Tail Blow Outs

[ReadyToCrash]

Originally Posted by jmtyndall

I wonder if you could carefully drill and tap each end for a set screw? Installed axially through the aluminum end, then you could adjust it out far enough that it acts as a limiter

great!

[Smoggie]

Originally Posted by jmtyndall

I wonder if you could carefully drill and tap each end for a set screw? Installed axially through the aluminum end, then you could adjust it out far enough that it acts as a limiter

Well yes you could but drilling down the middle of the aluminium drive spiggots then tapping them out would be very tricky and require special tools (taps at least). It would be a easier just to cut down a 700e TT and be done with it.

[jmtyndall]

Well I would agree. But it's an option lol

[cbrkhan]

Originally Posted by ReadyToCrash

so you didn`t have to change the tt? interesting news, but how to stop the tt from moving back and forth? if so, one end will certainly disengage the opposite gear...

Nothing fancy, I just glued an old TT bearing to the TT where it meets the gear 5mm out. Now even if you wanted, TT cannot be pushed any further into the gear and remains 5mm out.

[szaki75]

anyone tried to use the new 3 blade tail from Align to cure the blow outs?
550E Three Tail Blade Set
http://shop.align.com.tw/product_inf...oducts_id=5788

[cbrkhan]

Originally Posted by szaki75

anyone tried to use the new 3 blade tail from Align to cure the blow outs?
550E Three Tail Blade Set
http://shop.align.com.tw/product_inf...oducts_id=5788

I am ..... it may be sometime before I get the bird back in the air and test out results

[apper001]

Definetly looks the business, what blade size?

[szaki75]

will try with 95mm and less care the blade balance at the moment.
align doesn't offer 3 blade set in 95 size... yet. only 90 and 105

http://shop.align.com.tw/advanced_se...blades&x=0&y=0

[apper001]

At same tail ratio would this add a 1/3 more tail power aka bigger tail servo?

does need tweaking of the FBL PID, it's all lot of mechanical tail authority?!

[szaki75]

more tail power, but not sure if exactly 1/3 more..
i think the current tail gain should be lowered some. how much? God knows... and me after the maiden in 2wks.

[cbrkhan]

Here is some detailed discussion on this topic ...


https://www.helifreak.com/showthread.php?p=7068900

[Smoggie]

Originally Posted by szaki75

more tail power, but not sure if exactly 1/3 more..

Yeah something around that figure... Roughly equal to what you would get from increasing blade length from 95 to 105mm (but you cant put 105mm tails on the 600 without a stretch).

Cost wise the stretch with 105mm tails is probably cheaper, and would slightly less torque to drive. But the tri blade has the advantage of being 'off the shelf'.

[apper001]

and it looks pretty awesome with major bling effect IMHO

the force is getting stronger with this goodie, what's the currwnt rate for this option?

and no need for a beefed up tail servo?!

seems to a good idea with not the perfect execution by align...

[Smoggie]

No need for a 'beefed up' tail servo whatever you do. The Trex 600 tail servo is the same servo as used on the 700, so plenty of power to spare.

[Heli.Maniac]

Originally Posted by Grumpy_Old_Man

No need for a 'beefed up' tail servo whatever you do. The Trex 600 tail servo is the same servo as used on the 700, so plenty of power to spare.

Those are my thoughts as well. The extra power required to move 3 95mm blades may be just a tad more than running 2 105mm blades. And judging from the Velos 3 bladed tail that uses 135mm blades and a "regular" tail servo, I think it will be just fine for the 600.

[apper001]

You ran your align ds servo's at 8V, they're spec'd to 6V?

just read the comments on hf, and no one came up with a disaster story so it should work....

[Heli.Maniac]

Originally Posted by apper001

You ran your align ds servo's at 8V, they're spec'd to 6V?

just read the comments on hf, and no one came up with a disaster story so it should work....

I did ran my DS610s at 8V and never had any issue. In fact they are still working and waiting on a new heli to be fitted to. But those were the cyclic Align servos. The DS650 and all other 6V Align tail servos can't handle the higher voltage as well as the cyclics did afaik. Maybe it will work fine but I was very hesitant to try it with mine. You have 2 options if you want to go with higher voltage:
1. Go with a LiFe pack. I haven't heard a single case of servo failure occur with the 6.6V that a LiFe pack outputs and you should be safe.
2. Make a stepdown to take the higher voltage down to about 6V for the tail servo only.

IMO the only reason to run those servos at higher voltage would be the convenience and cost savings of running a 2S Lipo/LiFe directly to the servos instead of purchasing a BEC. If you already have a BEC then I don't think the risk is worth it. After all, the performance increase is very small and probably not so noticeable unless you are already pushing the limits of the 6V specs.

[apper001]

OK, thanks for detailling that a bit more. Nothing todo then but fly it!

forgot: any tuning we didn't discuss which is really worthwhile?!

[Heli.Maniac]

Well aside from the main tail gain which will need to be lowered to avoid tail wag, I really don't see anything else that should be noted for 3 bladed tail tuning. You will just go the normal route like setting up a 2 bladed tail and see where this takes you. Just make sure that you lower your main gain and maybe turn your tail stop gains back to default values before the first flight after the conversion to avoid massive tail wag and gear stripping.

EDIT:Just to be clear, you were asking about 3 bladed tail tuning right?

[jmtyndall]

I talked about three blade options a while ago, and couldn't find anything suitable to the job. I think 3 blade 85mm is a good place to start, maybe move up to 95mm if needed.

You want to balance the additional holding power with the strength of the torque tube gears, which happen to be a weak point.

In the end, I think if you tune the gains right, a 3 bladed tail will fix all the issues.