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Pro2K (sort of) Servo/Batt questions

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Pro2K (sort of) Servo/Batt questions

Old 01-15-2003, 07:04 PM
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Paul_Barsamian
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Default Pro2K (sort of) Servo/Batt questions

Got a pro2K (a converted CT w/ %95 of the upgrades to make it a pro2K, just needs the CNC blade grips and FB control arms). I got it on a trade, mostly looks good, except 2 things I need some help with.

1) Head is mushy on dampening, it has the big black CNC head. Which part number do I need to replace the dampers? Can't figure it out from MA's site or from Heliproz.

2) Cyclics are using older JR4131s and the collective has a Futaba 9202. I put a new freshly peak charged JR 1800 maH batt pack in along with a new power switch. I am using standard voltwatcher mounted in a visible area near the rear of the heli. When I start, I see a full charge, but after about 2 minutes the battery starts to dump to the bottom point (on the voltwatcher) and the machine starts to become unresponsive. Tried two other batteries, same result. I am using a JR 531 on throttle, and a GY 501/Futaba9253 for the tail with a Futaba PCM receiver. Range check is fine, linkages are pretty smooth in movement. What am I doing wrong? If I sit it on the bench, I get the same results if I work the servos around for a while (engine not running). Do I have a bad servo? Is something wrong with the electrics?

Thanks for any and all help, I can't wait to get this thing dialed in, it looks to be a great flyer...
Old 01-16-2003, 04:15 PM
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Default Pro2K (sort of) Servo/Batt questions

Update:

Pulled all linkages, cleaned, re-oiled (triflow is absolutely the nuts as far as lube goes) and reassembled with the linkages snug but not too tight. Replaced the 9202 on collective, (talked to a bunch of people and the consensus is that 90oz/in is a good minimum for torque on a 60 sized collective system, the 9202 only had 72oz/in). Cycled the batt, and viola!!! Suddenly the batts are OK. Once I realized I had the engine too lean and riched it up a full half turn to begin tuning in again, I could actually hover and fly it around.


Morals of the story

Use a servo that has enough torque for the application.
Make sure all linkages are smooth even if the heli has been flown and especially if it has been sitting around for a while.
Use something to watch voltage (and implicit current) activity on the electrical system in flight, too much of a drop on a fresh new pack indicates a problem with one of the components, replace one by one until it works.
Old 01-18-2003, 09:01 AM
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Galifrey
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Default Pro2K (sort of) Servo/Batt questions

b0gh0s there is an MA conversion for the head dampers using the ally headblock and plastic blade holders...

not sure of part number tho...
Old 01-19-2003, 03:27 PM
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Default Pro2K (sort of) Servo/Batt questions

Really?
What does the conversion do? The current set of dampers I have are so soft I am afraid I'll boom strike it if I loop.
Old 01-20-2003, 06:37 PM
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Default Pro2K (sort of) Servo/Batt questions

The Part Number is 120-70 and was designed for the fury extreme or any other X-Cell using the CNC headblock 844 and plastic blade grips...

It includes shims to stiffen the damping, thrust bearings and a circlip'd axle...

You can find more details at http://www.x-cellrchelicopters.com click x-cell news and look at 2002 edition 2, all the details are there...

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