Hangar 9 F4U Corsair
 

Hi all,

The new Hangar 9 Corsair is shipping and it is indeed a beauty! This .60-size WWII fighter has 90 degree rotating retracts.

As usual, I wouldn't get any glow fuel near a classic like this model so my e-conversion project will be using the new AXI 4130 direct drive brushless outrunner motor from [link=http://www.hobby-lobby.com/brushless_axi.htm]Hobby Lobby[/link].

For more information on the new Hangar 9 design, go [link=http://horizon.hobbyshopnow.com/products/description.asp?prod=HAN2575]here[/link].

RE: Hangar 9 F4U Corsair
 

hello greg,

just a quick question for you, i am converting the world models corsair to electric as well as my AT-6 and just wanted to ask, when you mount the motor to the firewall that you let me know how and what you used to get the right distance for the prop to clear the cowling ? i presume you will be using the radial mount set with this plane but it doesnt look to be long enough without some kind of spacer or block behind the mount and that is what i need to know, what can you use ? thanks again for all the help everyone :)


bassmanh

RE: Hangar 9 F4U Corsair
 

I am coverting a Great Scale Planes / Flair 68" Mustang to electric, and i am also using a AXI 4130 motor and Jeti 77 Opto ESC.

I am going to create a spacer block i think and use the radial mount. Not so sure about that bracket thing, so the radial seems best.

Need some suggestions on what wood to use for the block though? [sm=drowning.gif]

RE: Hangar 9 F4U Corsair
 

Hi Bassman,

Right you are! A simple modification on the ([link=http://www.hobby-lobby.com/motormt.htm#AXI1]PM41001[/link]) Aluminum Motor Mount for AXI 41 Series Brushless Motors is all you need. I'll be posting photos soon.

Chris,

Use a basswood or plywood block for your spacer.

All the parts in my Hangar 9 Corsair looked great! After my success with their AT-6 model, I am becoming a real Hangar 9 fan!

The wings, fuselage, and tail all came in perfect condition. The cowl and canopy were pre-cut and pre-painted. I'll be cutting holes in the plastic mock radial head for air cooling. This is recommended for either electric or glow power.

RE: Hangar 9 F4U Corsair
 

I've discovered that Hobby Lobby can be a one-stop source for all your e-conversion needs.

I'm selecting all plug-n-play components for my e-conversion like the [link=http://www.hobby-lobby.com/brushless_axi.htm]AXI 4130[/link] motor, Graupner [link=http://www.hobby-lobby.com/propadap.htm]GR605360[/link] 6mm prop shaft adapter, and the Graupner [link=http://www.hobby-lobby.com/grprop.htm#3%20Blade]GP315080[/link] 15x8, 3-blade prop.

Check out this fit!

RE: Hangar 9 F4U Corsair
 

Here is the [link=http://www.hobby-lobby.com/motormt.htm#AXI1]PM41001[/link] Aluminum Motor Mount for AXI 41 Series Brushless Motors. This mount allows you to attach the motor on the outside of the firewall just like a glow engine mount.

To make the prop adapter extend to the correct distance from the firewall to the cowl opening, you simply make two aluminum sheets that are 2" long. This extends the motor shaft to the proper position.

I reversed the center screw set (supplied with the mount) so that the smaller head clears the rotating can.

RE: Hangar 9 F4U Corsair
 

greg thanks,

i just ordered my AXI 4120 setup with the jeti 70-3 opto ESC, but the mount is on back order and i wont get that for about a week or so :(.

greg, are you using a Ubec with this setup ? i didnt order one, i actually didnt think of it untill after i had placed the order. do you really need one or can you stick with the RX battery ? the corsair im puting this in weighs 6.5 lbs set for glow and i dont think the few ounces the RX batt weighs will affect it at all as an electric since L.A. johnson from hobby lobby tells me it will have EXTRA power in this plane.

keep us posted with your progress on the F4-u :)
bassman

P.S i will be turning a 14X10 prop on this set-up running 14 GP3300 `s

RE: Hangar 9 F4U Corsair
 

Yes, I am using a UBEC and the Jeti ADVANCE 77-3P Opto ESC.

The nice part about the Jeti ESC is that it comes with the mating connectors for the motor.

The UBEC is a state of the art switching regulator designed to convert an input voltage from 5.5v to 35v DC into a regulated output voltage of 5v to power your receiver and servos. The UBEC can deliver a continuous current of 3amps and a peak short term output up to 5amps. This is meant to handle power for up to 8 servos.

A typical 4-cell receiver battery pack weighs 3.2oz so I saved 2.2oz along with the added convienience of not having to worry about re-charging another battery pack.

RE: Hangar 9 F4U Corsair
 

Before mounting the motor to the firewall, I wired everything up so it was plug-n-play once installed.

RE: Hangar 9 F4U Corsair
 

This is an interesting conversion, can't wait to see how it goes.

RE: Hangar 9 F4U Corsair
 

Hi guys,

I am looking at doing the same conversion. Do you all expect the plane to balance properly with the AXI in the nose? it seems like a much shorter nose than the P-51.....i'm considering power options.

by the way, do also know any reason why the Hobby-lobby specs on the AXI motors and the manafacturer's are so different? (watts output)


thanks in advance,

chris

RE: Hangar 9 F4U Corsair
 

Hobby Lobby presumably used different propellers, different batteries, and had different atmospheric conditions when they tested the motors. That said, the numbers for the 4120 series are completely off on the Hobby Lobby site. Not to slight Hobby Lobby in any way, but go by the numbers on the modelmotors.cz website. They're much more realistic.

I don't think Greg will have any trouble balancing the plane. He's going to slug an 18-cell pack of Sub C cells in the fuel compartment. The motor weighs ~12 ounces, and is hanging way off the firewall too. Remember, this plane was meant to fly on a .60, with 12 ounces of fuel. .60 engines aren't that heavy, and 12 ounces of fuel doesn't weigh nearly 12 ounces.

RE: Hangar 9 F4U Corsair
 

hello again, does anyone know what kind of duration we can expect from these motors ?i cant seem to find anything printed anywhere. i have talked to several people including L.A. Johnson from hobby lobby and from what i gathered flight times with 14 2400 SCR`s should be around the 10 minute mark for my set up, but i cant find any test data anywhere :( let me know if you find any or know of a site already. thanks.


mitch

RE: Hangar 9 F4U Corsair
 

Chris,

It's been my experience that the battery packs can compensate for almost any offset in CG. In the the larger e-conversion models, their is typically plenty of space to move them forward or aft.

As for a descrepancy in specs, I wasn't aware of any and will look into it.

Mitch,

Duration is not based upon the motor but rather the current draw from a battery pack. Check out my Hangar 9 AT-6 review for examples in the top Specifications section.

The AXI motors are typically less efficient than geared high Kv motors so the duration will be slightly less. In the end, the absolute flight duration depends upon the model design, your flying style, and the use of throttle management.

Enter the Lithium cell and it becomes much less significant due to the huge increase in power density.

My pre-wired motor mounted with ease using the stock T-nuts and screws that came with the kit.

RE: Hangar 9 F4U Corsair
 

If you want a ROUGH idea of your total flight time, it's a rather simple calculation. You do, however, need to know the full throttle Amps drawn by the power system.

Basically, you divide the mAh rating of the battery by the Amps drawn, and that will give you a rough estimate of the run time.

Let's say we have a motor drawing 40 Amps, and a 2400mAh (2.4Ah) battery. Divide 2.4 by 40, and you get .06 hours. .06 hours is 3.6 minutes, or 3 minutes and 36 seconds.

That's about all the fancy *calc programs do.

RE: Hangar 9 F4U Corsair
 

Nice choice Greg. Keep us updated.


-mike

Corsair Aileron Servos
 

To keep my Hangar 9 Corsair light, I used some Hitec components that I bought from Hobby Lobby. My four HS-85 "Mighty Micro" metal gear, ball-bearing servos provide 49oz/in torque and weigh only .77oz or 1/2 the weight of a standard size Futaba S148 servo.

The smaller size of the servo didn't matter with the mounting scheme used on the Corsair wing for the ailerons.

I extended my servo cables using a 24" section of flat cable that I soldered myself.

A little epoxy held the supplied wooden blocks in place.

RE: Corsair Aileron Servos
 

Just when I thought it was perfect, I realized my servo arms were a touch short.

I cut out a small slice in the balsa to allow the plastic keeper (not shown) to move just below the surface. You may wish to try a longer set of arms for the aileron setup than what is provided with the servo.

RE: Corsair Aileron Servos
 

Some close up shots of the fuselage reveal the quality of construction and covering detail that has made me a real Hangar 9 fan.

RE: Corsair Aileron Servos
 

It seems that every part of the fuselage is rounded and sheeted with balsa before covering.

The tail slots and motor mount holes are pre-cut.

The canopy area is pre-finished and the cover pre-painted.

RE: Corsair Aileron Servos
 

hey greg,
all my stuff came today i WAS so happy until i took the motor and mount out of the boxes and there were no screws to mount the motor to the mount!!!! i called hobby lobby and asked if they were included and they said no. so i just said for a $ 139.00 motor they should be and they said they would send them out to me free of charge :)

made my day BUT now i still have to wait to get it done until they show up. but anyhow almost ready to get back at it and when i do i will post a couple pics for you to see. although i think i will have to wait until spring to fly it, as its cooooold here and snow on the ground now .

greg hows your plane looking ? does it look like the motor mount will be strong enough with the exstension ? it looks like i will need to add about an inch to the mount to clear the cowl O.K.

keep us posted and let us know when the maiden will be and she does :)


mitch

RE: Corsair Aileron Servos
 

Mitch,

It is typical for the motor to come without mounting screws. The reason is that they are typically the wrong length anyway. Do youself a favor and stock up on some metric hardware because, if the motor isn't metric, the gearbox usually is.

Here are some more photos of my prop and adapter.

RE: Corsair Aileron Servos
 

Of course, I also had to paint the prop tips to match my rudder top. :)

Corsair Retracts
 

After struggling a bit with my retracts on my Hangar 9 AT-6 Texan, I finally got them the work great by bending the legs so that they were vertical when landing. This required a good deal of transmitter use and the receiver also needed to be powered by a battery.

I decided that for my Hangar 9 Corsair, I would purchase an Astro Flight Servo Testor from [link=http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXVK79]Tower Hobbies[/link] for $20.

It has been a great tool so far! I now use it on all my servos when testing the linkage and throw range.

RE: Corsair Retracts
 

The retracts on the Corsair rotate 90 degrees as they open and close. It was fun just to watch as I studied the mechanism and worked them manually from the control rod.

They appeared to work fine and the one linkage piece that was nylon in my AT-6 retract linkage was now metal in my Corsair linkage. This made me happy because I felt it would make it more robust.

Note that in the photos, you can see the string run through the wing for extracting the aileron servo leads. A nice design touch by Hangar 9.