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VQ P-39 electric.

Old 07-22-2008, 12:53 AM
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Default VQ P-39 electric.

Guys I have just converted the VQ Models P-39 (60"ws)to electric. I used an e-flite .46 and a castle phoenix 60 esc. I fly using two 3s 2300ah bstteries in series. So far I've have several flights of about 10 to 12 minutes and the batteries still show about 50% remaining. The .46 motor turns a 13x8 master airscrew K series prop. The airplane is fast and very easy to fly. The only draw back is I have to remove the wing to change batteries. That will soom be fixed. I have been quite surprised by this motor set up. This is my first big electric I've fly the PZ T-28 and other small electrics. I would recommend this plane and motor for anyone wanting to get into bigger planes. I photo documented the building steps and would be willing to help anyone endevoring to do the same.

Paul
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Old 07-22-2008, 09:53 PM
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Great conversion Paul, I've got my old 25cu powered P39 to do some time in the distant future. The firewall mounted on threaded shafts is a great idea. Do you use it to adjust thrust angles and c of g position? Baz.
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Old 07-23-2008, 07:25 PM
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Baz,

Yes, you can adjust the down thrust and right thrust, it works really good. It has an unforseen benefit. Since the VQ plans gave no thrust angles I decided to just eye ball it and fly it. Since I didn't know exactly where the motor would end up I did not mount the cowling. On my second flight I landed short in heavy tall grass (2' tall). As soon as the landing gear touched the grass the plane nosed over, not settle gently into the grass as I had expected. As the picture shows the motor mount gave and absorbed all the impact. There was no other damage only the 1/8" ply motor mount. It would seem I have invented the flying version of the energy absorbing front bumper. LOL

Paul
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Old 07-24-2008, 11:27 AM
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I will definitely use your idea when I convert the P39. It has all the advantages with no disadvantages that I can see. Sorry to hear about the crash but as you say the design saved the day. Great idea. -Barry
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Old 07-24-2008, 05:39 PM
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That's a handsome P-39 you've got there. The motor looks like it will really drag it across the sky. I've always liked the P-39- it always gets short shrift as a fighter. The Red Air Force sure did good work with it. Curious, no?
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Old 07-24-2008, 07:49 PM
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Voyager,

Yes that e-flite .46 provides abundant power. Last evening I programed flapperons and airbrakes. Hope that will help slow it down for landing. It seems to just glide forever. I'm not that good with it yet so I have to make several approaches to get it down where I want it.... For an inexpensive plane it is a real winner.

Paul
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Old 07-27-2008, 08:10 PM
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Paul, how much did you invest in the P-39? It doesn't look inexpensive! A great compliment in my eyes if it is cheap.

Bob
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Old 07-28-2008, 05:37 AM
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Bob,

Let me qualify inexpensive "A quality ARF under $150".

I believe it was $129. on sale. I just went to check

http://www.vqwarbirds.com/products/aircraft/p39.html

and the price is now $155. I figure still a good price so I bought another. As it does not seem to be a popular bird I just didn't want to see them stop carrying it before I got ready for my next one. I would like to do this one in a Russian color scheme with retracts and a detailed cockpit. I will also make the canopy and cockpit removable so I can change batteries with out having to remove the wing.

Paul
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Old 07-28-2008, 07:13 PM
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I did mine in a british scheme as a british variant modified to a US scheme when it was taken over again by US forces. I have it in a book somewhere. Barry
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Old 07-28-2008, 08:57 PM
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That's a nice looking P-39. I too like the 39.
Glad it flies well too.

I want to build the big brother, the P-63 this winter.

Paul
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Old 07-29-2008, 04:49 AM
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Paul,

I bought a nice set of plans for a P-63 from www.unclewillies.com Since I bought a second P-39 I will probably never get around to building it. Or updating it. I remember this plan set from the 60's when I was in highschool. They can easily be updated to today's modern materials and building methods. The radio gear shown is so old it even has an elevator trim servo beside the elevator servo. Uncle willie sells these plans in tiff. format so you can do about anything you want to them with Adobe Photoshop, or Delta Cad. Then e-mail them to Kinkos for full size prints

Paul
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Old 07-29-2008, 05:01 AM
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Hi Paul,
I think Uncle Willy has the old Maxey Hester P-63 that was kitted by Sterling.
If it is, I already built that one.
I think the link you have is incorrect. It brought me to a generic site.
This one got me there http://myunclewilliestoo.com/about1.html

It's a pretty large plane. I remember changing a lot of it to try to get a more scale look to it.
I have to stay smaller now. I have some Wylam three views of the P-63 and I'll try to build one from them.
Probably around 55 inch is about my size limit.

I still like your P-39. I like that a lot more than the old P-63.

Paul
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Old 07-29-2008, 06:56 PM
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Paul,
Yes, it was Hester's plan. It was the only P-63 I could ever find. It seems to me a guy named De Bolt did one years ago, but I was never able to locate them.

The P-39 has a couple scale issues. Check out the shape of the wings, the strip ailerons and the nose gear it too far back. That's probably why it is such a good flyer. In any event I still like it.

55 inch ws is a nice size. I will be interested in watching your construction. Since I have my engine mount on a CAD program It will be simple to reduce it slightly to fit your bird.

Paul
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Old 07-29-2008, 08:08 PM
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Hi Paul, you're right the wing profile does not look round enough seen from below. Actually it's more 109 ish in shape. So what though if the plane performs really well. I know my old P-39 is only 40 inch span with a near scale wing profile and if you go dead stick or slow up too much it'll drop a wing for sure. Surprised I've had it so long really. Barry
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Old 07-29-2008, 08:42 PM
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You're right the wing taper is off.
I didn't notice that before.
All this talk about the P-39, now I want to get mine flying again.
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Old 07-30-2008, 02:57 AM
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Paul,

Nice model and plan set. Go to Google and search Russian P-39 then select images. There are some pictures of a Russian P-39 that was recovered from a lake after 55 years under water. Interesting stuff.

Paul
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Old 07-30-2008, 03:00 AM
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Thanks, I'll check that out.
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Old 05-20-2009, 12:55 AM
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Destroyer...I just ordered one of these planes from VQ....intrested in how it is going.

Also, did you get your battery door mod done....and do you have any pics of it.

Thanks.
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Old 05-20-2009, 06:58 PM
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Cherokee,

I never did get the battery door done. Since I have moved I don't have the space to do that yet. So for right now I still take the wing off. You will really enjoy this plane it is a very nice flyer. What motor are you using?

Paul
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Old 05-21-2009, 04:43 AM
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I just ordered the plane today, so I have a little time to plan. This is going to be my first big plane. Right now I am leaning to this power system setup, but it could all change. From what I have read this combo flys the VQ mustang well

http://www.hobbycity.com/hobbycity/s...idProduct=4907

http://www.hobbycity.com/hobbycity/s...Mount_(25/30mm

http://www.hobbycity.com/hobbycity/s...eed_Controller


All but one of my planes flys on power systems from this source and I have never had a problem. I was thinking about going with something different but figured why mess with success.

If there is any intrest I will do a step by step buildup of the plane. I have always wanted to do one of those.
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Old 05-21-2009, 08:31 PM
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Cherokee,

It looks like you have selected a very effective motor and esc combination at about half of the price of my e-flite/phoenix 60 setup. It should give you more than enough performance. In my P-39 I use 3s A123s in series. What battery set up do you have in mind.

I would be very interested in you doing a build. Especially if you are going to install some type of battery access hatch. Check this build out

http://www.wattflyer.com/forums/showthread.php?t=37274

It is how I installed a battery hatch in my Boulton Paul Defiant. It is probably how I will do the P-39 someday. If you want I can send more detailed photos.

Paul
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Old 05-21-2009, 09:23 PM
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I will post up the build info when I get started on it....I will warn everyone that I build SLOW. So I just may document the project then post it all at once.

For Battery I am thinking of a 5s5000 pack.

I am very excited about getting started with this project....and a little nervous. I have never built or flown anything this big before. But from what everyone says the bigger they are the harder...err wait the easier they are to fly.

When I actually lay fingers on the plane I am sure I will have some questions.
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Old 05-21-2009, 09:33 PM
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Cherokee,

Not to worry, this plane has no bad habits. If you can fly a Parkzone T-28 you can fly this one, it's just a little faster. You could always use an instructor with a trainer box on you first couple of flights.

Paul
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Old 05-22-2009, 02:49 PM
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Thanks, I am not that into the big planes, but I had to have a P-39. There are a couple of not too common planes they have that intrest me.

I like to keep my planes close and pretty slow, I like to see the pilot, pannel lines, all the detail when it flys by. That is the cool part for me. It is also fun to hit the gas and have it do a roll on the way up, but I like planes that can slow down.

The largest plane I have is the PZ Corsair, everything else is little, GWS warbirds, and GP WWI Spad. The spad is just so good looking in the air, but the smallest wind just pushes it around and it starts to look a little toy-ish as the wind bounces it around.
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Old 06-10-2009, 08:15 PM
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uncle willes is not there any more any where else to find plans in 48" ws for electric or .25 glow?
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