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Old Sep 20, 2003, 12:15 PM
Registered User
Deland FL
Joined Jan 2003
284 Posts
Li-poly for 1.5-2.0 amps (Wal-mart sky surfer)

I have another thread over in parkflyers on my $18, 26", 2.0 oz
wal-mart sky surfer. It is controlled by differential thrust.

http://www.rcgroups.com/forums/showt...40#post1314640

Stock battery is 3-cell 200 mah nimh weighing about 0.4 oz.

The plane will only climb on the very top of the pack, so I would like to put a bit more kick in the pants with a single lipo.

I checked the amp draw and it is 1.5 at about 3.4 volts. I would guess less than 2.0 amps at 3.7 volts. What is the best li-poly in the 0.4 oz weight class to support this draw? I tried a 830 qualcomm, but it was too heavy at about 1 oz.

Also, any ideas on how to make a RFFS conversion from this plane are welcome. I have no RFFS experience. Maybe I should start another thread here in indoor.

Thanks, John
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Old Sep 21, 2003, 06:39 AM
Oxford Panic
AndyOne's Avatar
United Kingdom, Oxford
Joined Feb 2003
3,654 Posts
John,

The best Li-poly is the Kokam 340mAh capable of 6.8A, it only weighs 0.32Oz

Andy.
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Old Sep 21, 2003, 07:36 AM
Foam rules
Thatovalguy's Avatar
HdG Md.
Joined Jan 2003
4,914 Posts
John, I second Andyone, get yourself a 340 pack, you'll have what you need. You might even try a 600 kokams, its only a tenth and change heavier.
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Old Sep 22, 2003, 12:14 AM
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Dan Leonard's Avatar
Lenexa KS USA
Joined Jun 2001
347 Posts
I bought one of these today and I think the best battery would be the E-Tec 250. Longer flight time then the NiMH but 1/2 the weight. And it will fit right in where the other batteries fit without mods.
Thanks
Dan
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Old Sep 22, 2003, 08:29 AM
Registered User
Deland FL
Joined Jan 2003
284 Posts
Let me know how yours flies Dan. Mine will not really climb, but will achieve level flight on the top of the pack. Only good for a minute or so before it becomes underpowered.

I am doing a mod right now to make it a pusher. I suspect that the prop position in the middle of the wing was destroying much of the lift. Probably not giving the best thrust either.

I reversed my polarities on the motors and put the prop on "backwards" haven't had a chance to fly it yet. I'll close up the stock prop holes in the wing with tape to restore the wing's lifting ability.

I moved the rx to the rear of the compartment and am going to put a 850 Li pO (lightest I have)
(0.6 oz) to the front. Should balance at stock point more or less. I probably gained 0.2 oz or less, as I have removed the on/off switch and fuse bottom and some tape.

I was going to take off the foam fuse but it really serves a structual function keeping the wing from folding.

John
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