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Feb 13, 2006, 03:28 PM
Registered User
neil, a 5" is probably a bit too small and spinning too fast. it might be worth a try, however. i can tell you that the gws 5x3 prop flew my 20" hobbico/cox p40 perfectly. with this plane, however, i am not so sure.

the ips S2 is only 15 US dollars, not that bad. if you already have the edp-150c then it's probably worth trying, but if you have to buy it i would go with an option that can swing a bigger prop. also make sure you use a lightweight lipo with the edp-150. a thunderpower 480 weighs 23 grams and will give you 5 amps.

jeff
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Feb 15, 2006, 10:47 PM
Registered User
N827TM,

Thanks for the awsome documentation, Did you have to bevel the aileron and elevator edges to get clearance for the throws? I didn't see it in your document.

Thanks,

John
Feb 16, 2006, 10:01 PM
Mansell Models
N827TM's Avatar
No, I left a slight gap. I made sure the ailerons would move about 45 degrees each side. The gap is just under 1/16" of an inch.

Tom
Mar 13, 2006, 05:12 PM
Bush Mechanic
neilmny's Avatar
Hi Tom,

I'm still lurking about. Have started some of the conversion but trying to save it for a winter project. It may not last until then though.

I have a brushless that has a prop shaft on it and I was wondering if the fee flight prop would be suitable as I have been able to adapt it to suit my motor. It came with a GWS style mount that I had to modify but has fitted well too. I only have to work a different version of stick mount to accomodate it.

The motor is a BM2410-12T apparently 1530kv and a BSC15A 15 amp ESC as well. Motor weighs a bit though at 54.5gm. Does this combo sound OK. I was hoping to use my 8*AAA 900mAh NiMh packs that run my Beaver. They are about 100gm.

I'm going to get some Blue Arrow 3.5gm servos as well and use a Blue Arrow 5 channel receiver both items are nice and light.

Any thoughts would be appreciated.

Thanks,

Neil.
Mar 14, 2006, 09:43 AM
Mansell Models
N827TM's Avatar
Neil, I am unfamiliar with your brushless motor and speed controller. It should work. The KV of your motor is the same as my motor. My motor weighs 30 grams. I had to add some lead to the nose to get mine in CG. So your heavier motor should work. My battery pack weighs 53 grams. My Waypoint Servos weigh 3.8 grams. I also have three of them. My all up weight is about nine ozs. I don't think you want to get to much heavier than that. As this model was originally built to be a free flight model the overall weight is 5 ozs. Again mine came in at 9 ozs. The closer you can keep it to 5 ozs or the lighter you keep it the better it will fly. Again it is a very pretty looking airplane when put together. It also flies nice. If you have any pictures post them.

Tom
Mar 15, 2006, 12:48 AM
Bush Mechanic
neilmny's Avatar
Thanks Tom,

Not a lot to show as yet but I will add some photos as I get further along.
Probably the biggie at the moment is to sort out the motor mounting and make it so I can remove the motor if I want or make it servicable.

Because of the style of the motor, which I understand was designed for GWS type planes and has 3mm longish shaft, I might be able to mount it off the main fuselage section on the "firewall".

http://www.aero-fever.com/product_in...products_id=48

I just noticed that the KV rating on this advert is 1260. Hmm, I may have been dudded the eBay store I bought it from said it was 1530KV.

They are very cheap and I also have on order a BM2408-21T which is a 1750KV version, which is definite.

One or other should do the job.

http://www.aero-fever.com/product_in...roducts_id=130

The ESC I bought was this one which should be spot on.

http://www.aero-fever.com/product_in...a2a52c9227b0a3

Neil.
Last edited by neilmny; Mar 15, 2006 at 01:02 AM.
Mar 15, 2006, 03:22 AM
Registered User
Flywellnz's Avatar
It seems that the BM2410-12T's are available either Delta (triangle on the label) or Star (Star on the label) Delta's have Kv of 1530 and Stars are only 970. Refer to http://robotbirds.com/catalog/ look under Outrunners/parkfly motors
The difference in reality on a 3 cell lipoly is that the Star version will only turn a 8X4 GWS prop at 6600rpm. My earlier purchase of a Bm12 (different motor but Kv of 1530 or so) turns the same prop at 11000rpm. Believe me that this combo goes very well in a GWS Mustang! Now, I wonder if I can reconfigure the Stars to Delta?
Mar 15, 2006, 04:31 AM
Bush Mechanic
neilmny's Avatar
Hi Flywellnz,

Thanks for that info. I read somewhere about the 970KV and thought ouch that's bad, I hope I dont have that one. Sad thing is on test at full throttle and 9.6V NiMh draw was only a few amps which is not a good indication perhaps. It was mounted on a stick and wasn't exactly trying to yank my arm off either, where as my Beaver with a 350C gives some really good thrust at the same setting. I saw something somewhere in RCGroups about changing from star to delta, so it must be possible to go either way. I'll look into it, but I do reckon the 2408-21T will do the job and it's just a straight change over on the mountings it seems.

Thanks again,

Neil.

How would I tell if the motor was star or delta connected (wound?)?

Heres the thread - https://www.rcgroups.com/forums/showthread.php?t=485307
Last edited by neilmny; Mar 15, 2006 at 04:45 AM.
Mar 15, 2006, 09:10 AM
Mansell Models
N827TM's Avatar
I did not realize that you could actually fit this motor into the cowl. The motor I have seen is a big motor. The biggest size propeller I recommend is a 7x6. If you get any bigger than that you might run into torque issue at slow speeds. Neil I sure would like to see some pictures with your setup when you get there. In my videos I am flying on a GWS 6X5 prop and it is almost going straight up 3/4 power.
Mar 15, 2006, 02:21 PM
Bush Mechanic
neilmny's Avatar
Gedday Tom,

It took a fair bit of material removal and I'm working on a mounting that comes from the fuselage and it's so far so good. I'll post a couple of pictures tonight for you. I think it will be good.
I'm going to try the prop that came with the kit as it fits OK (with a bit of encouragement ) on the 3mm prop shaft. The motor will be running close to the inside of the cowl but with a slowly slowly fitting approach I think I can make it work.

Neil.

OK here they are. As I said it's only the beginning.
A second firewall layer will be added in front so the stick will mount in something reasonably strong and in a normal stick mount manner.
That's the theory anyway. Lets see how it goes.
Last edited by neilmny; Mar 16, 2006 at 01:30 AM.
Mar 16, 2006, 04:51 AM
Registered User
Flywellnz's Avatar
Hi Neil - Assuming your motor has a sticker on it (some do not), it will either show a little star or triangle. Star - Start of each phase (there are 3 of course) is the power in, ends of all three are soldered together. Delta - End of one phase hooks up the the start of the next phase. Have a close look at the Gobrushless diagram.
Thanks for the conversion link - that gives me more confidence to have a go at converting them. (4 to do)
BM12 - I was trying to remember what the originals unlabeled motors that I purchased were called. Checking my emails shows they were refered to as Towerpro BM2410-12 - Strange that the originals have 9pole stators and 12 magnets. The low Kv versions have 12pole stators and 14 magnets!
I have been swapping emails with the supplier to try to figure exactly what the earlier ones are. Best guess at present is BM2409-12 - does anyone know how many poles these have?
Regards Gordon
Mar 16, 2006, 05:14 AM
Bush Mechanic
neilmny's Avatar
Hi Gordon,
No I dont know about the 2409-12 regarding poles unfortunately but i do know that my BM2410-12 has a little star on the sticker. I guess that makes it the 970kv model doesnt it. Rats! It also has a 12 pole stator and 14 magnets. Double rats! Glad the motor was dirt cheap. Do you think that 970kv would drive the Mustang at about 7.4 volts? Thats around 7000 rpm dropping to say 5600 at 5.8V.

Neil.
Mar 16, 2006, 08:49 AM
Mansell Models
N827TM's Avatar
Neil, Nice job. Those pictures look great.

Tom
Mar 16, 2006, 09:49 AM
Frankenstein recycled packs
rampman's Avatar
Try one of these.
http://www.rchotdeals.com/Products/r...mbo240918.html
I have one on my slow stick with a 3S LiPo and it does an accelerated climb at 1/2 throttle.
...and for only 30 bucks for the combo...
They come with the GWS type plastic stick mount, not the one shown. Also, the ESC is not totallylinear but with a smaller prop than the 10 x 4.5 that I run, this should not be a problem.
Mar 16, 2006, 01:03 PM
Registered User
Flywellnz's Avatar
Neil - 970kv motor will not fly the Mustang on 7.4 volts. Kv, I believe, is unloaded rpm. My BM2410-12 did 6600 rpm on 11 volts or so with 8X4 prop. Not enough either!
I did try a 2408-21T with the 8X4 on 2 cells. Cannot quite recall the rpm but it was more than that. Flying was just adequate, not exciting! I found the 2408-21T got really hot fast on 3 cells with the same prop. That seems to fit with other peoples experience (some even melted the solder joints on the motor). I switched motors at that point!
Regards
Gordon (about to go to work)


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