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Old 04-04-2014, 10:00 AM   #1
P51 nut
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Default Top-Flite Gold Edition P-51 (65" WS) electric conversion

I'm currently building a TF Gold Edition Mustang and am wondering if anyone has either done a conversion on this airframe or has any good insights on a suitable power system for it.

Basic specs of this bird are:
Stock Number: TOPA0110
Wingspan:
65 in (1651 mm)
Wing Area: 734 inē (47.4 dmē)
Weight: 8-10 lb (3629-4540 g)
Fuselage Length: 56.6 in (1438 mm)
Engine Required: 2-stroke .61-.90 cu in or 4-stroke .91-1.20 cu in

As with most of my planes, "If it can't go straight up, it ain't got enough power" is my basic rule of thumb.
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Old 04-04-2014, 10:20 AM   #2
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Also, I'd like to consider using a 4-blade prop if one will fit into the parameters already listed.
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Old 04-04-2014, 11:41 AM   #3
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Originally Posted by P51 nut View Post
I'm currently building a TF Gold Edition Mustang and am wondering if anyone has either done a conversion on this airframe or has any good insights on a suitable power system for it.

Basic specs of this bird are:
Stock Number: TOPA0110
Wingspan:
65 in (1651 mm)
Wing Area: 734 inē (47.4 dmē)
Weight: 8-10 lb (3629-4540 g)
Fuselage Length: 56.6 in (1438 mm)
Engine Required: 2-stroke .61-.90 cu in or 4-stroke .91-1.20 cu in

As with most of my planes, "If it can't go straight up, it ain't got enough power" is my basic rule of thumb.
I have the H9 P-47 with a 66" wing that I used a Power 110 on 9S with a CC 110 amp esc and it balanced out with no additional weight to balance. If your Mustang has a forward hatch to give access to the forward tank area behind the firewall then you are in good shape to do the conversion-----your power paks must be up in the forward tank area to get a good CG without adding weight. A power 60 or equivalent on a 6S pak would be minimal power.
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Old 04-04-2014, 10:20 PM   #4
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Originally Posted by P51 nut View Post
I'm currently building a TF Gold Edition Mustang and am wondering if anyone has either done a conversion on this airframe or has any good insights on a suitable power system for it.

Basic specs of this bird are:
Stock Number: TOPA0110
Wingspan:
65 in (1651 mm)
Wing Area: 734 inē (47.4 dmē)
Weight: 8-10 lb (3629-4540 g)
Fuselage Length: 56.6 in (1438 mm)
Engine Required: 2-stroke .61-.90 cu in or 4-stroke .91-1.20 cu in

As with most of my planes, "If it can't go straight up, it ain't got enough power" is my basic rule of thumb.
I had a P-51 model of similar size several years ago. Sold it to a club member. This model flew very well with a Hacker A50-12S motor, 15X10 APC-E two blade prop, and a 6S2P A123 battery pack. These electric motors can swing larger diameter props than the similar Horsepower glow engines. Make certain your model won't have issues with the prop hitting the ground on take off.

Power was around 1200 Watts, pulling 77 Amps out of the A123 pack. This is pretty close to what a 90- 4S engine can do. You might go for the Hacker A50-12L motor or similar mfg type motor for a bit more power. FYI, the Hacker A50-12L motor has more watts or horsepower than an OS glow 90 or 120 two stroker.

IMHO, you will need some 150 Watts per pound of airplane for good vertical climb out.

Here is some info on models of this size.
Thread on 70 size glow engine conversion to electric
http://www.wattflyer.com/forums/showthread.php?t=45222

Hacker 6S2P A123 powered Models
http://www.wattflyer.com/forums/showthread.php?t=44686

Hangar 9 Kantana Model
http://www.wattflyer.com/forums/showthread.php?t=68844

And, a real world direct comparison between various glow/gasoline power units and electric power systems.
http://www.wattflyer.com/forums/showthread.php?t=73275

DennyV
Retired and the days are just too short, busier than ever!
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Old 10-08-2014, 03:04 PM   #5
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Ive got a power 60 in mine plenty of power with a 100amp hobby wing esc 3300mah 65c 22.2 volt battery. You may run into problems with a 4 blade as this puts way to much drag on the motor.
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Old 10-08-2014, 03:56 PM   #6
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Axi 4120/18 is a decent .60-.75 replacement. 4130 series recommended for .90.
Look these up for some specs to compare when choosing the motor.

***********

The main reason to go with more blades is to keep the prop tips out of the dirt.
Each added tip induces a LOT of load on the motor. For this reason when you add a blade going from 2 to 3 you would expect to reduce diameter and/or pitch. A 10X6 2-blade compares well with a 9X6 3 blade for load on the motor.

The full scale P-51 used a 4 blade prop because 2 blades would have required the landing gear to be 3 feet longer.

Our models tend to use shorter props than full scale already. It would take very careful motor selection (maybe none available) to swing a scale (or near scale) 4 blade. You might end up having to have a very heavy motor.

Yo can't count the blades while the plane is doing a low flyby...
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Old 10-08-2014, 06:05 PM   #7
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Originally Posted by Mad Thunder Bomber View Post
Ive got a power 60 in mine plenty of power with a 100amp hobby wing esc 3300mah 65c 22.2 volt battery. You may run into problems with a 4 blade as this puts way to much drag on the motor.
400 or 470 kv model

Too many hobbies, and not enough time!
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Old 10-08-2014, 11:12 PM   #8
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I have the 470 power 60 with an APC 15x8 I want the scale look too but havent seen anyone swing 4 blades with that motor on an 8 lb bird. I have a MA 3 bladed 15x7 That Im wanting to try but am leary of pulling too many amps! Heres a couple pics of my 51 have you got any to share.


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