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Old Feb 08, 2004, 09:49 PM
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Joined Jul 2002
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P-51 Mustang First Flight Report w/ Questions

Hi all,

I went to maiden my P-51(300 motor and GWS 7.2v batteries today and here is how it went.

Hand launched @ full throttle and it flew 10 yards straight and then rapidly descended. I tried this 4 times and got the same result. Luckily nothing broke!! It seemed under powered. Can you aid me in some suggestions to make this warbird fly?
Thanks in advance
John
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Old Feb 08, 2004, 09:53 PM
Video Juggernaut
Wingbreaker's Avatar
FL
Joined Nov 2003
2,655 Posts
put a 350c and a KAN 650 9v in it. It will fly like crazy. I hear the 300c set up is real tricky to get going. You need a light battery and have it balanced just right.
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Old Feb 08, 2004, 10:06 PM
two left feet
Austin, TX
Joined Aug 2003
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Re: P-51 Mustang First Flight Report w/ Questions

Quote:
Originally posted by ChefBoyRD
Hi all,

I went to maiden my P-51(300 motor and GWS 7.2v batteries today and here is how it went.
Yep, you need a battery pack with more oomph. 7.2v is a 6-cell pack, you need at least 7 or preferably 8 (if nimh) or 2s lipoly. But keep it light, pack should be about 4.5oz or less. So don't let them sell you some 1100 Hecells...

The 8 cell 650Mah KAN or CBP (cheapbatterypacks.com) pack is an excellent suggestion. If you don't mind going lipoly, a 2s 1500 Kokam pack is a perfect fit for this plane in stock config.

Also your 7.2v pack, how many mah is it? If it like one of those small 270mah packs GWS sells for the Tigermoth/Pico Cub/Stick, it won't deliver the current necessary for the motor.
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Last edited by busybee; Feb 08, 2004 at 10:08 PM.
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Old Feb 08, 2004, 10:41 PM
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will I need a new charger for the kan batteries?
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Old Feb 08, 2004, 10:47 PM
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Busybee,
I went to cheapbatterypacks.com and saw all the 8 cell KAN's. But I was unable to determine which one was the 650mah. Can you link me there
Thanks
John
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Old Feb 08, 2004, 11:08 PM
two left feet
Austin, TX
Joined Aug 2003
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Quote:
Originally posted by ChefBoyRD
Busybee,
I went to cheapbatterypacks.com and saw all the 8 cell KAN's. But I was unable to determine which one was the 650mah. Can you link me there
Thanks
John
Go here :
http://www.unipros.com/cbpsite/packs...sion_id=100149

The pack I've used with success is the "8 cell Hi power Slow stick pack - Flat" part #A8CBP650FT. Should be $16.00. The standard GWS esc will be a JST connector, or choose the connector you want.

A couple of things -- you might need to remove some foam to get the pack to fit properly. Be sure to check CG. Also, as with any NIMH pack, slow charge it first (1/10C or so), then charge it no more than 2C subsequently. NIMH packs also take a good 3 or so charge-discharge cycles before they achieve best performance.

Good luck!
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Old Feb 08, 2004, 11:24 PM
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lehigh valley, pa
Joined Nov 2003
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i maidened my p51 w/ a kokam 2s 700mah with the stock 300c. balancing was no problem , but flight was somewhat interesting. the 300 motor just doesnt have enough power to do anything besides keeping it in the air. since then i have added a gws corsair to my fleet so i bought the kit with the 350 motor. i will be putting a himaxx in the corsair so i tried the 350 in the stang. what a difference!! now i can hand launch without having to acutally throw it. it also maintains about 60ft altitude on about 30% power. definitely consider a motor upgrade. having that extra power will surely put a smile on your face.
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Old Feb 08, 2004, 11:30 PM
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Busybee,
Thanks so much for your help..Im getting closer here. With the battery you suggest will I need to purchase another charger. here is the charger I have...

Eflite DC Fast Charger for small electric aircraft.

30min time charger
Charges 6/7 cell Nicd & Nimh 250-700 mah packs.

I am guessing this is not good enough...can you suggest a charger that will work for the new battery?
Thanks
John
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Old Feb 09, 2004, 01:37 AM
two left feet
Austin, TX
Joined Aug 2003
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Do you have any specs on that charger? Couldn't find anything on the web. Just about any charger will do for 7-8 cell nimh packs.... but if you are going to spend the money for a new charger, you might consider getting a charger that does lipolys too.

I've got two chargers, a GWS 2002 and a Hobbico MkII. They both run about $49. I use the GWS 2002 for my nimh packs, but it won't do lipoly. The Hobbico MkII I use for my lipoly packs, but I have read a couple of threads that indicate it may not be good for nimh (although that is what it is advertised for... nicad, nimh, and lithium)...

I would defer to someone else on what the best charger would be. I've gone the cheap route and it has worked great for me, but I know there are better chargers out there. Anyone else want to chime in here?
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Old Feb 09, 2004, 01:43 AM
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lehigh valley, pa
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my triton works great for charging all my packs from tx nicd's to lipolys
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Old Feb 09, 2004, 04:11 PM
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Hernando,Mississippi, United States
Joined Apr 2003
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The Stang flies really nice on the 350C and 2s 1200 lithium pack.Battery needs needs to be moved way forward though and don't add wait .Mine is at 13.8 oz auw now it .Best combo I've had so far, except when I had the Razor 400 in it.
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Old Feb 09, 2004, 04:40 PM
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Lynnwood, WA
Joined Jan 2004
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I was having somewhat the same problem, except mine would only fly about 10 yards(P51 8.4V 700mah). I was told that you need to push the battery pack as far forward as possible. Havent actually been out flying it yet, but have taxied around in the parking lot and it seems alot better.
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Old Feb 09, 2004, 04:49 PM
Houng-wen Lin
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Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
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Dear ChefBoyRD, wish to see more detail about your P-51 equipped???

TX, RX, battery size and capacity, ESC, gear ratio, prop...

The more detail you said, much easy for us to figure out where is the problem occured.
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Old Feb 09, 2004, 05:30 PM
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Canberra, Australia
Joined Dec 2003
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Im going 350c with my new gws spitfire.

Will a 2s2p 1200 pack be too heavy? I think with a 9x7 or apc 9x7.5 it should give nice power and good flight times.

Im wondering how well the 350c holds up to 10 min + flights with this combo. The 350c in my Estarter cooked after 15minutes air time but I was pulling too many amps with the 10x8 even tho that what mr lin puts in the box
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Old Feb 09, 2004, 09:53 PM
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Joined May 2003
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Just a reminder, make sure your prop has its words facing outwards. Many a times ppl put the prop backwards which results in not enuff power.
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