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Jan 12, 2020, 04:45 PM
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Guyzerr's Avatar
Thread OP
Help!

FMS P-51v8 Upgrades ( Keeping it simple )


Because there are so many posts in the other thread a person can get lost I'm hoping this thread will stay specific to my questions for simplicity sake.
Hopefully others will benefit as well.

I have had questions answered in the other thread but some issues still remain and to that end I sent a PM to Sideslip. I'll post it here and anyone that's able can feel free to reply. ( It's not showing up in my sent box )

" I really hate to work behind the scenes but I'm in a bit of a rush to order stuff if I need it so I'd like to ask you some stuff for sake of clarity. This electric stuff is all greek to me. I'll post the end result in the forum so that others can benefit as well. "

1- Will that aluminum backplate fit on the stock motor without alterations? It looks considerably thicker than the plastic one.
Link: http://www.customrcparts.com/index.p...roducts_id=217

2 - Is there a spinner that will work with it and the 4 blade prop?

3 - Do I really need to get one of those 650k motors you suggested or is that just a recommendation? If I get one will the aluminum backplate work with it?
Link: https://www.horizonhobby.com/4528-motor-kv650-fmmkv650

or as condor12 mentioned.... ( considerably cheaper ) Is this motor specific to your aircraft or will it work on the P-51 as well?
Link: http://www.hobby-paradise.com/en/pro...ct_detail.html

4- Is buying a different ESC as mentioned a necessity or a recommendation? Is it due to athe kv650 upgrade?
Quote:
Originally Posted by Sideslip
2. Increase the size of your ESC accordingly. At least 80 amp and perhaps 100.
Can someone provide a link to the prop modification I keep reading about? Something to do with zip-ties I think.

I'm asking because for example that spinner backplate will end up costing me well over $100 cdn dollars, not the $70.00 US that it's listed at. The plane cost me $400 plus tax . It's crazy up here.

Thanks for your help...
Guy
Last edited by Guyzerr; Jan 12, 2020 at 05:44 PM.
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Jan 12, 2020, 08:51 PM
Registered User

Some info for you


1- Will that aluminum backplate fit on the stock motor without alterations? It looks considerably thicker than the plastic one.
Link: http://www.customrcparts.com/index.p...roducts_id=217

It's EXACTLY the same dimension as the stock one, I have three and love them.

2 - Is there a spinner that will work with it and the 4 blade prop?

You use the front part of the stock spinner.

3 - Do I really need to get one of those 650k motors you suggested or is that just a recommendation? If I get one will the aluminum backplate work with it?
Link: https://www.horizonhobby.com/4528-motor-kv650-fmmkv650

Yes it will work with it or the stock spinner. You may need to purchase the FMS F3A prop adapter to get the correct gap on the spinner.

Link to motor and prop adapter and X-mount

https://www.aliexpress.com/item/3284...c00jqfC8l&mp=1

https://www.aliexpress.com/item/3292...c00jqfC8l&mp=1

https://www.aliexpress.com/item/3296...c00jqfC8l&mp=1


or as condor12 mentioned.... ( considerably cheaper ) Is this motor specific to your aircraft or will it work on the P-51 as well?
Link: http://www.hobby-paradise.com/en/pro...ct_detail.html

Link above is same motor from Aliexpress

4- Is buying a different ESC as mentioned a necessity or a recommendation? Is it due to athe kv650 upgrade?

A very vise recommendation, here's a link to a very decent 100 amp ESC that will give you all the breathing room you'll ever need.


https://hobbyking.com/en_us/turnigy-...html?wrh_pdp=3



Quote:
Originally Posted by Sideslip
2. Increase the size of your ESC accordingly. At least 80 amp and perhaps 100.
Can someone provide a link to the prop modification I keep reading about? Something to do with zip-ties I think.

Use this link and then scroll down to where it says "This is my Prop/Spinner & FMS G&C 4250-540kv set-up for the P-51B "Old Crow"

https://www.rcgroups.com/forums/member.php?u=293994
Jan 12, 2020, 10:26 PM
Registered User
Davy101's Avatar
If you want to install a motor that livens up the FMS 1450mm Mustang, and that is 5s and 6s capable, I suggest the Predator branded FMS 4258 550kv motor. It was stock on the FMS Pitts biplane. If you do a google search, you'll find it is still available. What the already mentioned 650kv motor does on 4s, the 550 does on 5s (except with longer flight times!) and exceeds on 6s. The Mustang is easily able to handle the weight of these larger packs. I've flown 6s 4000mah batteries with no problems.

One word of caution however, you absolutely SHOULD upgrade the stock plastic prop hub (what the blades mount to) to the already mentioned aluminum replacement hub if you do this mod! The stock plastic hub isn't strong enough to survive the RPMs that 5-6 cell systems generate. The stock hub will explosively disintegrate eventually and probably result in your plane nosing in for a total loss.
Jan 14, 2020, 05:17 PM
Twins are Twice the Fun
OV10Bronco's Avatar
Quote:
Originally Posted by Davy101
If you want to install a motor that livens up the FMS 1450mm Mustang, and that is 5s and 6s capable, I suggest the Predator branded FMS 4258 550kv motor. It was stock on the FMS Pitts biplane. If you do a google search, you'll find it is still available. What the already mentioned 650kv motor does on 4s, the 550 does on 5s (except with longer flight times!) and exceeds on 6s. The Mustang is easily able to handle the weight of these larger packs. I've flown 6s 4000mah batteries with no problems.

One word of caution however, you absolutely SHOULD upgrade the stock plastic prop hub (what the blades mount to) to the already mentioned aluminum replacement hub if you do this mod! The stock plastic hub isn't strong enough to survive the RPMs that 5-6 cell systems generate. The stock hub will explosively disintegrate eventually and probably result in your plane nosing in for a total loss.
Davy......that is incorrect. The 4258-Kv550 is stock on the 1400 F3A Olympus and the 2000mm Beaver.
The Pitts had the 5060-Kv360.
Regards,
Warbird Charlie
Jan 14, 2020, 11:24 PM
Registered User
Guyzerr's Avatar
Thread OP
Thanks for all the input and suggestions.

Thought I'd let you know where I am with this aircraft.

Being winter where I am I haven't been able to fly it but have spent countless hours reading and watching YouTube videos. I've ordered the backplate from Custom RC parts ( http://www.customrcparts.com/index.p...roducts_id=217 ) and will definitely paint, balance and install the assembly . I'm going to order a spare set of prop blades in the next day or so just for the sake of having them if needed. I'll do that when the suppliers have an original spinner / backplate available. As of today there are none in North America but that's supposed to change in the near future. We'll see. I don't plan on needing it but you never know. If I could find an aluminum one that fits the 4 blade prop I'd get it.

Other that that when the weather clears I'm just going to fly the dickens out of it. I'm not looking to break any speed records so the motor upgrade will take place only if needed. From what I see in the majority of videos the thing flies great with 4000mah 4s. Speed freaks will beg to differ but we all have our own style of enjoyable flying.

Thanks for your help....
Jan 15, 2020, 08:46 AM
Registered User
Davy101's Avatar
Quote:
Originally Posted by OV10Bronco
Davy......that is incorrect. The 4258-Kv550 is stock on the 1400 F3A Olympus and the 2000mm Beaver.
The Pitts had the 5060-Kv360.
Regards,
Warbird Charlie
Thanks for the double check on that. I got my signals crossed; the 5060 360KV Pitts motor is the suggested upgrade to the 1700mm Mustang and Corsair, not the 1450mm one. You are correct, the 4258 550kv came from the Olympus.
Jan 16, 2020, 09:22 AM
Registered User
Regarding the metal Cnc back plate, I would be hesitant in using one in my fms birds. While the plastic backing plates are prone to cracking, they are easy to check and relatively cheap. The aluminum plate will transfer the force of any prop strike to the motor shaft as opposed to the blade attachment.
On the other hand, If you are going to use 5s or bigger, you are going to need it. I feel it could damage your motor if you have a serious prop strike, though.
Ymmv
Jan 16, 2020, 12:05 PM
Warbird Enthusiast
LICobra's Avatar
Quote:
Originally Posted by spit n pitts
Regarding the metal Cnc back plate, I would be hesitant in using one in my fms birds. While the plastic backing plates are prone to cracking, they are easy to check and relatively cheap. The aluminum plate will transfer the force of any prop strike to the motor shaft as opposed to the blade attachment.
On the other hand, If you are going to use 5s or bigger, you are going to need it. I feel it could damage your motor if you have a serious prop strike, though.
Ymmv
I agree that the forces from prop damage could or will affect the motor, with the plastic plate I have had slow taxi nose overs, whether on the grass or hard surfaces and have had enough damage (with cracks in the plastic and the prop side supports damaged) to discard the plastic plate...with the aluminum plate maybe a prop blade was changed....the motor still running normal and no bearing noise. If the hit was much harder besides replacing the spinner assembly you might have to replace motor bearings.
I will say this since the motor upgrade to the 4258 (460/550/650) series, the motors are larger and stronger then the 4250 (540/580) series which I had several bearing issues even without the aluminum backing plate.

Now if you had a stock plate with "unknown damage" you might loose a prop blade or two in flight, the plastic spinner will explode apart and usually take part of the cowl off too....I have had on 6S, lost 3 blades but with the aluminum plate the damage was contained to only a loss of blades with the fuse staying intact, although the motor board was loosened from vibration, but no visual damage. I guess you have to ask yourself it is cheaper to buy another motor or another fuse ??

Granted the aluminum plate is not cheap but for me it is a good insurance policy, the FMS plastic pieces are drying up since they basically have stopped production with only one version left (Red Tail) and that's probably because there left over from low sales compared to the other schemes...albeit it's just my opinion.
Jan 16, 2020, 08:50 PM
Registered User
Guyzerr's Avatar
Thread OP
Quote:
Originally Posted by LICobra
Granted the aluminum plate is not cheap but for me it is a good insurance policy
LOL....
I ordered one a couple of days ago and just took a look at my Visa. Converted to Canadian shekels it's costing me $ 107.04.
That doesn't count my expense to drive across the US border to get it and then pay the mail drop guys $4.00 for handling the package.
Jan 17, 2020, 08:53 PM
Registered User
Guyzerr's Avatar
Thread OP
I received my spinner backplate from Custom RC Parts today and must say it's a real work of art and worth every bit of what I paid for it.
( http://www.customrcparts.com/index.p...roducts_id=217 )


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