Need advise on building GWS P51 D Mustang

[daddy]

calling all ppl who flew the P51 b4 (electric version)..
ammo, hzm, nic, loyn and ER69, super honet pls come in..... anyone else who got something to share also come in.

I need advises on what motor type and size, prop, gearbox ratio to recommend. any building tips to share and also about the engine stall issue, how to min it? mine is the SG version, only body, no motor.

ER69 told me to smoothen the wing so that it will not stall at low speed so easily.

I got a old wing dragon brushed speed480motor, can that be use? do I need gearbox? or direct? if yes gear, which gear ratio good enough for a 0970 prop? or 1080? KNN. .confusing man.. ..

any feedback and advise are all welcome.

thank a million

[loyn]

Direct drive with a 400 motor for P51 is not too efficient ....super H would know that very well

For gearbox get the GWS C with the 370 motor , that is the recommended stock option. It run fine with 9070 (6~7 A on 2S lipo) more power with 1070 but 8~9 A on 2S) Using only 2S lipo min 1200 configuration, dont use 3S on brush motor (370) it kill it fast. Use GWS 300~400 type ESC for stock motor.

Other wise you can go for BL option, like the himXXX or out runner from AXx. You can use 3S lipo power will be super only if you can handle the plane.

Is not easy to fill all the panel line and not sure how effective it is to improve the low speed characteristic of the P51. Do prepare that at low speed it did have tendency to tip stall....

Reinforce the fuselage, especially the center section where the caonpy is open for battery loading. It can break into 3 section on hard landing. Dont ask me how I know Just glue a pic of 3mm hard wood on the side before you fix the 2 half fuselage together. That will significantly improve the strength without too much weight.

Oh do cut out a little more in the bat compartment so the battery can slide forward as much as possible. You need it to be a little nose heavy for in flight stability. If it have any chance of tail heavy.....good luck to you

Last but not least .....P51 is not a beginner plane.....if you have just flew the WD and want to move on to P51 direct ..... my recommendation is no....other wise your maiden may last less then 10s....and may also be the first and last flight of your P51

[alamin2]

Last but not least .....P51 is not a beginner plane.....if you have just flew the WD and want to move on to P51 direct ..... my recommendation is no....other wise your maiden may last less then 10s....and may also be the first and last flight of your P51

i think loyn made a very good point here. some or most of us has experienced this before.

unlike the WD , when this plane stalls.. you cant glide it well enough. it'll be just nose diving most of the time..

some outrunner motors run quite good like im using bm2410-09.

this plane doesnt fly easy , and unlike other GWS war bird, which ive flown the corsair and zero, i fnid the p-51 a litlte bit more ... "sensitive" . maybe it's just me

[leonlio]

P-51

Hi,
The GWS P-51 is a sensitive bird. The key is build light, build light, build light.
I've had 2 before and these hardly tip stall. Some of the points you may want to consider other than the above good suggestions:

1. Omit the rudder setup saves about 30g, and helps in balance of the plane.
2. Omit the main/tail wheels and all the landing gear plastics. Improves the flight dynamics, saves weight (about 20g) and makes it easy to balance.
3. Again.. reinforce the fuse area - as suggested by LOYN (very important)
4. Set the control throw to low especially if its your 1st warbird/flight.
5. Ground check..ground check.
6. Again..build light, survival rate is higher in a crash!

Happy landings
Leon

[ER69]

Power plant Set up

Hi "daddy".. I hope that I am able to provide you with some answer that you need. lets starts with the power plant first. here you go...

Best stock config:

Powerplant: GW/EPS-400C

Controller: GWS 25 ESC

Cells: Lipo 3s18001P

Prop: APC 9x4,7E
(Can fly but dont expect too much from it like unlimited vertical climb roll)

Best tuning config that I had tried:

Powerplant: HC2212-1180 Himax Brushless Outrunner Motor

Controller: CC25A

Cells: Lipo 3s18001p

Prop: 9x6 APC E

(Result : Unlimited vertical climb etc.. I think this mod is just nice not too overpower coz overpower is not good as well(might cause T/roll) but ofcouse better than under power )

[ER69]

Mod on fuse

Once you decided which power plant to use, lets go to step 2.
Some small Mod of the fuse to improve the air flow.
attached with pics so I no need to type so much coz end of the day pics tells it all..

[ER69]

Strenghten of the fuse.

Some GWS warbirds have a weak fuse, one of it is wat you are building now. P51D. if come to hard landing the fuse bottom where you attach the wing will crack.
Guess thats the stress piont of the plane..
Well, worry no more, as long you throw in some Balsa, or carbon rod to strenghten it.
Attached with pics..

[ER69]

Throw for aileron and elevator

The aileron and elevator surfaces are setup with maximum servo arm throws, along with 125% EPA (end point adjustment) for snappier rolls and manuevers. I start out by putting her on 50% dual rates and 50% exponentials only on the ailerons, On windy days, I found that it is a little easier to belly land her with 50-60% dual rates. This reduces my chances of my over-compensating for wind induced rolls or flips.
To prevent tip stall at low speed for landing, I had asked some of my flying kakis and did a bit of research on the net, the answer is the first deep panel line on the wing near to the wing tip that causes it to tip stall.
For me , I glassed the whole plane so I dont have this problem
If you think glassing is too troublesome, perhaps you can use a clear tape or foam filler to go over it. that it.
Some people have fear of this plane and one of the reason is because of this.
BTW I had P51 as my first GWS warbird.
Here are some step to take note before getting anyplane in the air,
1.Bulid slowly dont rush yourself.
2.Find out the best power set up for the plane.
3.Pre-flight check ( If something sounds funny,dont fly solve the problem then check again.. dont rush to fly it)
4. Pre-flight check .. Opps it i mentioned it already.
5. Check C.G.
6. Thrust angle.
7. Pre-flight check
8. Radio Fhz check
8. OK can fly liao.. now comes to the skill of the pilot.
One thing, dont fear of the plane..
the plane should fear you coz end of the day you are the one who is controlling it and not the action figure sitting inside the RC plane's cockpit.. (if you have one)
Think/plan of the air route and tricks b4 flying.
OK "Daddy" Happy flying
May the force be with you..

[ER69]

Some history of P51

The North American P-51 Mustang
I always like to know the backgroud of the plane that i am flying.
Here is a little history of the P51D.
The P51 is the most famous of the American "big three" from WWII: those being the P47, P38, and P51. It seems ironic that this fighter is so closely associated with American air power in the second world war; as it's design specifications and requirements were driven entirely by the RAF in the form of an order from the British Purchasing Commission. If it hadn't been for the outstanding performance of this fighter it might have existed simply as an American export to England; but after test figures came through the US was compelled to start using the P51 along side the P38 and P47 designs they had already committed to.

[Shark]

bro ER69... well said and well written .. thank you so much. I will start off with the stock configuration first. cos it my first warplane so better get the feel of it b4 going for the outrunner.

thanks loyn, leonlio and alamin2, I will remember all your pointers and get it onto my warplane.

[kennyc]

calling all ppl who flew the P51 b4 (electric version)..
ammo, hzm, nic, loyn and ER69, super honet pls come in..... anyone else who got something to share also come in.

I need advises on what motor type and size, prop, gearbox ratio to recommend. any building tips to share and also about the engine stall issue, how to min it? mine is the SG version, only body, no motor.

ER69 told me to smoothen the wing so that it will not stall at low speed so easily.

I got a old wing dragon brushed speed480motor, can that be use? do I need gearbox? or direct? if yes gear, which gear ratio good enough for a 0970 prop? or 1080? KNN. .confusing man.. ..

any feedback and advise are all welcome.

thank a million

Firstly,

Make sure you cover the panel lines on the wings.
either tape them up or fill them up with filler and then sand it smooth.
reason? this planes tips stalls due to those huge furrows.. can you imagine how big those lines are if it were full scale?

motor. perfect with a 2212/26 with a 9x75 APC on a 3s

as with all Planes, build it as true as possible.
squate to the vertical and horizontal.

lastly look up RC gropups on GWS mustang build thread.

you are gonna love this plane. i was still loving it when it crashed..(totally my fault

[ER69]

bro ER69... well said and well written .. thank you so much. I will start off with the stock configuration first. cos it my first warplane so better get the feel of it b4 going for the outrunner.

thanks loyn, leonlio and alamin2, I will remember all your pointers and get it onto my warplane.

Cool.. Dont worry, i think loyn and companies will help you along.

[daddy]

ER69, thank you for the deatil explaination. really no regret getting this plane.

[Shark]

Cool.. Dont worry, i think loyn and companies will help you along.

ya.. I will seek their advises, anyway this warplane have been in my storeroom for months, still NIB, not ready to build yet. or I am not ready for this fast plane yet

[HZM]

OOops.... didnt know I am required

I nv flew a mustang but had a spitfire. I recommend to go w 1080 prop w brushless 3S setup, D gearing. You get more thrust which is require if you go into bad situation.

In case u insisted on 3S on stock motor, make sure the BEC is able to take 12.6V .... my initial mistake nearly send my plane to earth w no control. General ESC will only able to take 2S unless otherwise stated.

Mike