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Old 01-04-2004, 06:50 PM   #1
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I am: Peter D
Join Date: Sep 2002
Location: LaSalle, Ontario
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Has anyone on this list tried any other batteries on their jet besides ni cads?

I would like to have one battery to start the turbine and run the receiver/servos. Is this a pipe dream or is it affordable these days?

If there is a set up please let us know about it, such as MAH, max current, charger, etc

Thanks and Happy New Year
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Old 01-04-2004, 08:02 PM   #2
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I am: Dean Wichmann
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Hi Peter

I have been using the NiMh in helicopters ( receiver 1400 mah ) for three years now and just love them. In my .60 machines I charge them at 1 C rate and fly the entire event ( Sat / Sun ) without charging again. They hold their charge very well and all I do is charge them once during the winter month ( when I am not flying ). I have found them to maintenance free ( ie no cycling ) but never let them run dead or they are ruined.

This year I started playing around with Lithium Polymer in my HotCat Turbine heli and I have found them great. Once again charge once and fly all weekend. The receiver pack is a 1900 mah redundant pack that I charge on a special 6 hour charger. It is used to supply power to 4 8311 digital servos a digital tail rotor servo and 502 gyro. I understand that the Lipoly can now be charged at 1C on special LiPoly chargers which measure peak voltage ( important for Lipoly ) so the technology for fast charging is there.
Now the good news - I will be using 2 1900 mah LiPoly packs hooked up to a Duralight Power Box which features built in regulator, amplifier, battery monitor. That will power the 9 servos ( and 2 electronic solonoids ) in my new KingCat. In addition I have a 4000 mah Lipoly ECU pack that is 3/4 the size and weight of a 1750 mah NiCad pack. The Lipoly pack will allow for 8-10 flights on the P160 before having to recharge. At most events I fly 3 - 4 flights per day so over the weekend I'll just fuel and fly - no more charging.

You asked about an all in one unit - I believe you may want to take a closer look at the BMT turbines. The ECU used for the engine is considered by many in the industry to be the way of the future. It has some very unique features that include the capability to charge the ECU pack while the turbine is in operation. I do not have first hand info on this so you may want to double check.

The turbines we use make excellent generators. I remember a couple of years ago seeing a charging circuit hooked up to a RAM 750 at the RAM facory and while it was running - it powered the flight pack / ecu and lighting system on a plane. RAM never released the unit but they had worked on it long enough to resolve such issues as spiking, rf noise etc.

Its no longer a hobby after 40 years....gulp!
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