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RE: P-39 by ESM - 11/29/2012 9:27 PM   
stuntflyr



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From: Pacific Palisades, CA, USA
Status: offline 		I watch this thread once a month or so and am gad you guys are building these models. Love Airacobras.
I'm building a Red Box TF P-39 kit for electric for an electric field. Always looking for good techniques and to see what's up in the larger sizes.
Chris...


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RE: P-39 by ESM - 11/30/2012 3:30 AM   
Veltro



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Status: offline 		Thanks Rick. Much appreciated.

- Jay

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RE: P-39 by ESM - 12/2/2012 12:26 AM   
AZThud


 

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Status: offline 		I have started the build of my P-39    I intend to finish it as one of the Guadalcanal P-400 (British Paint scheme) birds.    I also bought the P-39 retracts from Sierra and they really are works of art.    I am going to convert them to electric like I did with my LA-7, this so far, is looking a little more complicated than the LA-7.   I will also be installing Ty's Cockpit.    The other mod I am trying is to use hidden actuators for the ailerons and flaps.    Oh I almost forgot, I fly electric so I am going to need a battery hatch.    All in all there are going to be quite a few mods and I will let you know how it goes.

To start with I cut holes for the cockpit and battery hatch.    The hatch for the most part follows existing panel lines and the front will be hidden under the nose cowling.     I could not follow the curves of the existing panel lines at the rear of the hatch and just cut it square.    The cockpit hole is 7 inches back from the existing instrument panel, per Ty's video.    One thing I will mention is, in order to fit the cockpit I had to remove quite a bit from the kit's formers and servo tray.    Once I did that I looked at the hatch and the hole for the cockpit and think, I might have weakened the fuse a bit!.     I am sure I will think of something to firm it up. 

As I am going to be repainting the plane I opted to remove the existing markings.    I did this to improve the paint adhesion but I am not sure it was needed, these marking are really stuck on.     The Sierra gear is quite a bit longer than the ESM gear and is much more scale, the bad news is that the gear mounting point needs to be moved forward by almost 2 inches.   This places the mounting point entirely in-front of the firewall.     I used the existing the mount as a guide only and created a bit of a truss to mount the gear on.    The final piece of the gear mount will be to connect it up to the arms of the motor mount.    That will come later.     

Veltro I should be getting the wing joiner back tomorrow and will scan it and take some measurements.

Cheers

Rick




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RE: P-39 by ESM - 12/2/2012 11:44 AM   
Prekin



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Status: offline 		Hi Rick,
could you show some pictures of Ty´s cockpit for your P-39 please?


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RE: P-39 by ESM - 12/3/2012 1:52 AM   
AZThud


 

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Status: offline 		Got a little more work done, started on the cockpit.    My first observation is that like my LA-7 Cockpit from Ty this one is also a bit shallow,  the seat it where you can really see the lack of depth.   Having said that once the pilot is in there it should be fine.   The only problem with the cockpit kit that I can see so far is the one side of the seat was pulled beyond paper thin.   I am going to have to sister up another piece of styrene in order to build it up, more on that later.  

I also have a couple pictures of the gear and the motor mount.    The mount is a local design that allows for the motor to be adjusted for and back and up and down, as a result getting a nicely centered spinner should be achievable without the dead eye aligning skills :-)

Velrto no joy on getting the wings back today, I might be getting them this week, but in all honesty we are most likely looking at next weekend.

Cheers




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RE: P-39 by ESM - 12/3/2012 2:29 AM   
Chad Veich



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Status: offline 		Love that Sierra gear Rick! With the extra detail you're adding and the nose wheel up in the proper location this should be one great looking Airacobra when you're all done with it. I can make up vinyl "stick on" rivets as well as hatches and inspection panels for you if you want to put some surface detail on it before you paint.

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RE: P-39 by ESM - 12/3/2012 3:22 AM   
Veltro



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quote:

ORIGINAL: AZThud

Veltro no joy on getting the wings back today, I might be getting them this week, but in all honesty we are most likely looking at next weekend.



Not a problem. Thanks.

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RE: P-39 by ESM - 12/4/2012 4:01 AM   
AZThud


 

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From: Litchfield Park, AZ, USA
Status: offline 		Veltro I got the joiner back today, its 15/64 or just under a quarter inch thik, I Scanned it and attached is the PDF, its to long to scan the enitre length so one end is chopped off.

Look it over and let me know if I need to scetch it out, I can't right now as work is interfering with my playtime


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RE: P-39 by ESM - 12/4/2012 3:52 PM   
Prekin



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Status: offline 		What are the dimensions of the firewall? Is it good for DLE 30?

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RE: P-39 by ESM - 12/4/2012 4:06 PM   
NoFlaps


 

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Status: offline 		Check out the classifieds- there's a guy "Lovetoflyguy" who has one with a DLE30 for sale on it now- http://www.rcuniverse.com/market/item.cfm?itemId=885752
I've seen several of these with a 30cc and it works well. You could contact him, that guys a real pro and is very helpful.
I used the PTE 36 and with the stainless muffler from IBseeingyouRC (made specifically for this plane) cowl cutting is minimized- Be sure to tell them that you have the P-39 and that's the muffler you want. the stock muffler won't clear the nose gear blocking/ trunion. See my russian P-39 posts for pics of this.
Hope that helps a little~

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RE: P-39 by ESM - 12/4/2012 4:16 PM   
Prekin



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Status: offline 		Thank you, I saw your P-39. I like the Russian paint scheme, because I interested in Europe front, so if I make the P-39 I would make it in Russian colours.

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RE: P-39 by ESM - 12/4/2012 7:19 PM   
NoFlaps


 

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Status: offline 		The russians flew the heck out of these and has some really good successes. Looking forward to seeing your plane when she's finished ~!

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RE: P-39 by ESM - 12/5/2012 3:00 AM   
Veltro



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quote:

ORIGINAL: AZThud

Veltro I got the joiner back today, its 15/64 or just under a quarter inch thik, I Scanned it and attached is the PDF, its to long to scan the enitre length so one end is chopped off.

Look it over and let me know if I need to scetch it out, I can't right now as work is interfering with my playtime



Fantastic! This will work just fine. Thanks again.

Looking foward to your electric set-up. I'm still not sure how I am powering mine. Electric is still a possibility.

Jay


< Message edited by Veltro -- 12/5/2012 4:51 AM >

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RE: P-39 by ESM - 12/8/2012 4:13 AM   
AZThud


 

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From: Litchfield Park, AZ, USA
Status: offline 		Veltro the offer to sketch out the joiner is still on, let me know.

I have been working on the cockpit and the nose gear doors,  I made one attempt by trying to curve monocote trim film/monocote across the gear well then laying down some fiberglass.   I was not please with the shape or the rigidity, seems it became to flat across the biggest portion of the gap,  so plan B.    Plan B is to use balsa to help shape the monocote better.    This has me using some 1/4 inch stock, inserting it into the gap then sanding to shape.   Looked easy in my head!    I am currently waiting for the some bad resin to harden but I did take some photo's.     If anyone has some advise or a better idea as to how to shape the nose gear doors on this thing I am open to any suggestions.

Regarding the Cockpit, I cleaned up the resin parts and have primed and sanded them, this took a little more effort than I would have liked the resin had many holes, lumps and bumps.     I also bought a set of belts and some instruments from IflyTallies and am really pleased with them.    Once I get the parts cleaned up and add some additional detail I will post some photos.   Again any advice or idea's on the gear doors appreciated.

Cheers


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RE: P-39 by ESM - 12/8/2012 4:18 AM   
glazier808



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Status: offline 		Gear doors look fine!


Casey

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RE: P-39 by ESM - 12/8/2012 4:51 AM   
AZThud


 

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From: Litchfield Park, AZ, USA
Status: offline 		Thanks Casey

The shape is pretty good, its the fiberglass that is giving me fits,   I am on my second attempt as this is being typed, hope this resin sets up better.  Once I get a couple of layers on I will take some pics.    Also as I am planning for the inevitable gear up fiasco I am going to make a couple of sets before I cut out the balance of the kits fiberglass for the doors.

Cheers


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RE: P-39 by ESM - 12/19/2012 11:52 PM   
wallace.tharp


 

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Status: offline 		Chad, Is that counter rotating props on your Spit Picture? If so, you may or may not have heard about a so called "Contra" rotating double prop system that some pattern guys including Toni Frackawick, SP?? are using. I watched Toni fly a patten plane with a big electric set up, 2ea. 5000 li pos I believe. It was Quite impressive with two 3 blade props running in opposite direction. Lancaster, Ca. on Thanksgiving weekend. Ever seen it? wallace.tharp

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RE: P-39 by ESM - 12/19/2012 11:58 PM   
wallace.tharp


 

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Status: offline 		AZThud: Nice! Coming along slowly on mine. Ty's cockpit is almost finished, the rudder pedals are much too large, I'm going to try to cut them down some. I had to cut the forward hump in front of the stick flat to allow my instrument pannel to fit. My flat black primer looks good, but I use glossy plastic paint brushed on for my resin pieces and they don't look all that good. I may repaint them. I just got the new Version 3 control box for my former V-2 ESM retracts and I'll see how they work. I like your nose gear mount mod. I may try that. Keep those photos and infor coming. May be we can do a flight of two for our maidens!! Still looking for a good 1/6 scale WWII pilot. PS. Willey and the guys at Aux 6 have a field and an agreement with the Town of Buckeye just North of the RR tracks and off of Miller Rd. You'all should look into it. I can get you contact numbers if you are interested. wallace.tharp

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RE: P-39 by ESM - 12/20/2012 12:01 AM   
Chad Veich



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quote:

ORIGINAL: wallace.tharp

Chad, Is that counter rotating props on your Spit Picture? If so, you may or may not have heard about a so called ''Contra'' rotating double prop system that some pattern guys including Toni Frackawick, SP?? are using. I watched Toni fly a patten plane with a big electric set up, 2ea. 5000 li pos I believe. It was Quite impressive with two 3 blade props running in opposite direction. Lancaster, Ca. on Thanksgiving weekend. Ever seen it? wallace.tharp


Yes Wally, a Griffon and contra-rotating propellors from a Shackleton patrol bomber were fitted to the Spitfire Mk.XIX which used to belong to the Planes of Fame museum in Chino. I had the pleasure of seeing the airplane perform at an airshow a few years back. Awesome sight and sound! I have seen the big electric contra-prop set ups in the magazines but never in person. I'd love to use the system to build a Martin Baker MB-5 or Red Baron RB-51.




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RE: P-39 by ESM - 12/20/2012 12:10 AM   
wallace.tharp


 

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Status: offline 		Chad, "Too Cool!!!" What an airplane. Google will probably bring you some info on this prop system. Toni said it works similar to a posi track rear auto differential. It works, the pattern plane he was flying with it had great pwoer and verticle performance. Toni, and I'm sorry I don't know how to spell his name was head of the model shop at Dryden/Edwards for years and he flew in a world R/C model chanpionship in Europe. He has been a big time pattern contender for years so I'm sure you find infor on him and the prop system. Love to see your finished product. See ya, wallace.tharp

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RE: P-39 by ESM - 12/20/2012 2:25 AM   
wallace.tharp


 

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Status: offline 		Thud, Re: the post with pix of the forward nosegear mount, in the 1/1 world as you may know, that's how they mount the fixed nosegear on most single engine Cessna and Piper PA-28 etc. They simply use struts to place it forward the firewall. It all works good unless you make a landing or porpus striking the nose gear first. That results in generally a nosegear collapse. Same principle her I think. In your picture of the open fuse looking forward and down, what is the blind nut toward the front of the cowl for? Cowl mount? I too l am electric so it's all great info for me and I like the way you cut the hatch. Do you actually mount your electric motor to the mount? Thanks. wallace.tharp

< Message edited by wallace.tharp -- 12/20/2012 9:05 PM >

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RE: P-39 by ESM - 12/20/2012 4:05 AM   
AZThud


 

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Status: offline 		Hi Wallace

Yes the blind nuts in the fuse are for mounting the cowl, I have 4 4-40 button head screws to hold on the cowl.   Regarding the nose gear, I am planning an addition, I plan to bring a vertical member up to the motor mount.    The purpose is twofold one to reinforce the nose gear to the motor mount and second to act as a mount for the steering servo.   If that breaks its going to be ugly!      I have laid our 3 sets of fiber glass gear door blanks, not sure what else to call them, from which I will fasten the gear doors, I hope :-)     While the glasss was hardening, I converted the Sierra main gear to electric, I hope I can upload the video (can't).    I am currently working on the nose gear and converting that one to electric is its own brand of hell.    Maybe air ain't so bad after all!.    I am also working on the cockpit and have been adding some bits on top of the cockpit from Ty.    Its not ready for pictures just yet, but its getting there.     I have also stripped the covering off of the tail surfaces in preparation of glass and adding the fabric look to the tailfeathers.


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RE: P-39 by ESM - 12/20/2012 9:44 PM   
wallace.tharp


 

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Status: offline 		Thud, cool as always. Can I negotiate a set of these gear doors somewhere in the future? I'm starting out with just ESM Seies 3 electric retracts and Ty's cockpit. If the world of Aircobra is kind I will do more scale details after about 25 or more flights. I'll have to see your cowl fastners, sounds nice. We should not have the problems with vibration that the gasser guys sometimes have wallace.tharp

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RE: P-39 by ESM - 12/20/2012 10:50 PM   
Carosel43


 

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Status: online 		Hi Guys, i have posted a pic of my P39 before but Thud was asking me for some more details on the model.

Long story short i have not changed too much. I have moved the servos for rudder and elevator down to the tail. I cut out the hatch and made mounts inside. I then used 3mm steel rods and ball links to hook up the back end.
The retracts are the ESM air retracts and i have added 1/2 sq hardwood rails to the nosegear mounts as they were totally rubbish on my model.

other than that all i have done it paint it and add a basic cockpit. i have added gear doors and have a complicated cooling arrangement for the engine. sadly its too cold and wet to be running engines at the moment and as i do not have the spinner yet i cant sort out the c/g (its very nose heavy). i do however have this video of the engine in the model. the engine was not running to my satisfaction and i traced the likely cause to dust and debris in the valves causing a leak. i have taken the engine apart and fixed it but have yet to re run it and put it back in the model.

http://www.youtube.com/watch?v=mS-F96pVcUk

In other news i mentioned before that ESM were bringing in an 80'' zero and an 80'' Mig 3. I now have some piccies of the mig and it looks great!

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RE: P-39 by ESM - 12/21/2012 1:20 AM   
telejojo


 

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Status: offline 		I would put a remote glow on thats close to the prop.

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