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Top Flite P51 Build and conversion

Old 07-07-2007, 07:10 AM
  #1  
gwong
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Default Top Flite P51 Build and conversion

Gents,

This is my first attempt at building a plane of this size. Decided to convert it to electric since the field I fly at is electric only and a bunch of the members have converted H9 warbirds.

Here is the setup,

E-Flite Power 60
ESC to buy
6S 3700mah lipo to start with
Dave Brown 4 inch spinner
APC 15x10 prop
Hitec HS425 standard servos
Robart 531RS 85 degree retracts
Robart Struts
Robart retractable tail wheel
AR7000

Working on the nose / cowl now...lots of shaping and sanding...can't wait to see her fly.

Cheers,

Gord.
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Old 09-25-2008, 05:35 PM
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rgaynor
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I am building a Top Flite P51 B 65" and plan to convert it to electric. It was suggested that I use a E-Flite 110 with a 85 amp ESC and 2 4S 5000 lipos. Do you have any pictures of how you mounted your equipment into the plane?
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Old 09-25-2008, 05:46 PM
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Grasshopper
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Hello rgaynor and welcome to Wattflyer.

I hope someone else answers your questions but I doubt gwong will since he hasn't posted here for 10 months and this thread is 3 years old. I'd like to see some pictures of your conversion though.
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Old 09-25-2008, 05:49 PM
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I have just begun to built this kit and am looking for suggestions. Thanks for giving me the heads up about about gwong.
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Old 09-25-2008, 08:57 PM
  #5  
gwong
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Hi rgaynor,

I am still around :-), yes my build is taking way too long but I fly in the spring, summer and fall in other words as much as I can :-). I take the winter off from building as it's too cold in the garage :-(

Having said that I am at the point of sanding the zpoxy in preparation for primer.

As for tips...the only mod I did was to beef up the LG area with lite ply and gussets.

I will give you more details when I get home.

Cheers,

Gord
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Old 09-25-2008, 09:07 PM
  #6  
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That would be much appreciated. This TF P51B is my first kit build and I can use any suggestions and pictures. Specifically, do you have pictures showing how and where you installed the motor, esc and batteries.

Thank you Gwong for all your help.
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Old 09-26-2008, 04:45 AM
  #7  
gwong
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Hi Rgaynor,

I used a greatplanes motor mount for my Power 60, I also reversed the motor and used an AXI prop adapter...did like the idea of using a collet for such big prop.

Here are a few pics.

I plan on using a 6S 5000mah lipo and it will be mounted underneath the motor mount...I still need to build a battery tray.

I did a silly thing and used WBPU to adhere the .75 oz fibreglass to the main wing...well it caused the wood to shrink and now I can clearly see the ribs...not so good...have to fill and sand again.

As mentioned before I beefed up the LG area with some light ply and gussets.

I bought the Robarts 85 degree pnematic struts and 4" wheels.

If you go the same route...I would recommend mounting the LG deep enough so you can use gear doors...I didn't do this so I can't now...oh well.

I should have put in lighten holes in some areas but didn't do it...hopefully auw will be under 10 pounds.

Mine should be done by now but have helis, planes and got into rc cars to drive that's why it's taken so long...hopefully yours will be done sooner than mine.

If I can think of anything else will post it or let me know if I can answer any other questions for you.

Cheers,

Gord.
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Old 09-26-2008, 05:20 AM
  #8  
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A few more pics.
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Old 09-27-2008, 04:23 AM
  #9  
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Hi Gwong,
These pictures are very helpful and I appreciate your suggestions. I too have many projects in the work, so this build will take some time. I have only completed the stabilizer at this point. After talking to a few folks, it was suggested that I install an e-Flite 110 motor and (2) 4s 5000 lipos. I could also use a recommendation on the retracts. The kit calls for Robart 605/606 90 degree. I noticed that you are using 85 degree - any reason why? I was also considering using Lado 60-6 electric retracts (www.lado.com) so I don't have to worry where to put an Air Control Kit. Any thoughts on this product?

Thanks again and please keep the pictures and comments coming.
Ron
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Old 09-27-2008, 05:39 AM
  #10  
gwong
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Originally Posted by rgaynor View Post
Hi Gwong,
These pictures are very helpful and I appreciate your suggestions. I too have many projects in the work, so this build will take some time. I have only completed the stabilizer at this point. After talking to a few folks, it was suggested that I install an e-Flite 110 motor and (2) 4s 5000 lipos. I could also use a recommendation on the retracts. The kit calls for Robart 605/606 90 degree. I noticed that you are using 85 degree - any reason why? I was also considering using Lado 60-6 electric retracts (www.lado.com) so I don't have to worry where to put an Air Control Kit. Any thoughts on this product?

Thanks again and please keep the pictures and comments coming.
Ron
Hi Ron,

Wow Power 110 and 2 - 4S 5000mah it should be a rocket ship :-)

I stuck with the Power 60 and possibly 6S 5000mah as it seems to be best combo for me...I am planning for about 120 watts per lb...so I know the motor is rated for about 1400 watts and if keep her under 10lbs...it should be enough for decent flight performance. The 6S 5000mah pack will also be used in my logo 10 3D heli...trying to maximize my battery packs :-)

I did buy the 90 degree struts but I heard that the music wire is prong to snapping if your landings are not gentle. So I decided to get the 85 degree oleo instead for 2 reasons...the 85 degree structs will sit vertical when mounted on the wing...in other words cancels out the dihedral. The 90 degree struts would look spread out. The oleo are better looking and less springy than the music wire.

No comment on the electric retracts...never used or did any research on them when I was buying my parts. I went with the pneumatics because I think it's kinda cool and it's incredibly strong snaps the gear up and down nicely...have to be careful if you ever get your fingers pinched during a gear cycle it's gonna hurt

I also added a Robart retractable tail wheel, it's driven by a smaller air cylinder and the steering is controllable buy a pull pull system connected to the rudder servo.

The fillets I followed the manual but used automotive body putty to fill in the seams in the balsa and built then up slowly with the same putty. The putty is nice to work with, just wear a mask (the stuff sinks)...I sanded the fillets with fine sand paper comes out looking like glass.

Will take some more pics and be happy to post more details as I would like to finish her soon

Cheers,

Gord.
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Old 09-27-2008, 11:21 PM
  #11  
rgaynor
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Gord ( sorry the misspelling of your name)
It is my understanding that you need 100 watts per pound for scale flying. It would appear that a 60 is going to underpower your plane if it is over 6 pounds. Just a thought.

Thats again for your insite on the retracts - I will do a little more research.
Ron
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Old 09-28-2008, 08:05 AM
  #12  
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Hi Ron,

My full name is Gordon Wong...I just use my first initial and last name for my handle...no misspelling on your part :-)

The power 60 is good for about 1425 watts and if my all up weight is 10lbs than 1425watts / 10lbs = 142.5 watts per lb

They also use the power 60 in the Miss America P51 by Hanger 9.

It should be okay...if not gives me an excuse to get bigger motor.

Cheers,

Gord.
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Old 09-28-2008, 01:16 PM
  #13  
rgaynor
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Makes sense to me - looking forward to seeing how it flies. Good luck!
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Old 09-28-2008, 01:17 PM
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rgaynor
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One other question - where did you purchase the motor mount - I would like to use the same one. Thanks
Ron
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Old 09-28-2008, 06:05 PM
  #15  
gwong
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Hi Ron,

I had my LHS order it in for me but you can get them from Tower Hobbies,

Here is the one I used,

http://www3.towerhobbies.com/cgi-bin...?&I=LXLCL5&P=7

The problem is the bolt pattern does not line perfectly with the E-Flite motors as the mounts are designed for Rim Fire motors. I had to Dremel out the bolt pattern to fit in my Power 60. Your Power 110 is bigger so you will have to make sure the mount you choose can adjust for proper gapping between the back of the spinner and front of the cowl.

Cheers,

Gord.
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Old 09-28-2008, 06:08 PM
  #16  
gwong
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pskumarweb,

If this is your first RC plane ever, a 3D plane is not the best choice. You will probably get a better response if you post your question in the beginners section.

I suggest you find a club to join and ask experienced pilots to assist you.

Cheers,

Gord.
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Old 09-28-2008, 08:00 PM
  #17  
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Originally Posted by gwong View Post
pskumarweb,

If this is your first RC plane ever, a 3D plane is not the best choice. You will probably get a better response if you post your question in the beginners section.

I suggest you find a club to join and ask experienced pilots to assist you.

Cheers,

Gord.
Gord,

I have moved his post to the Radio forum to see if he get's a little better attention there.
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Old 09-29-2008, 02:11 AM
  #18  
rgaynor
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Thanks Gord - I just read that Hanger 9 makes a mount (han-4245) for my e-flite 110.
I appreciate all your help.
Cheers
Ron
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Old 10-05-2008, 03:32 AM
  #19  
gwong
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Hi Ron,

No problem...glad I can help.

I promised myself not to buy any more planes until this one is done...so I am making a real push to finish her

I am planning on painting her, well actually a friend is an automotive painter and he is going to paint her Aluminium color. I tried using covering but unless you are really really good it didn't turn out so good.

Either way the surface will show any imperfections so my advice is to spend a lot of time sanding and more sanding...thank God for ARFs !!!

Will post more pics when I have made significant progress.

Cheers,

Gord.
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Old 10-05-2008, 02:12 PM
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Sounds like a good suggestion. I hope you paint job turns out nice. BTW - do you live in the US or UK?
Ron
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Old 10-06-2008, 05:54 AM
  #21  
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Hi Ron,

I live in Langley, B.C., Canada eh :-)

Cheers,

Gord.
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Old 10-06-2008, 01:55 PM
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Our Northern neighbor. BTW - did you build the battery tray yet and if so, would you mind posting pictures? Thanks much
Ron
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Old 10-08-2008, 06:26 AM
  #23  
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Hi Ron,

I haven't built the battery tray yet...however I will be getting a Turnigy 100amp ESC this weekend :-)

Also did about 3 hours worth of sanding the other day...my flying friend says I am too picky about the surface

Hopefully she will be ready for the first passing coat of primer, than I have to fill in the low spot, sand down the hi spots and do another coat of primer...hmm maybe he is right about being too picky...have to remember it's sport scale not super scale for a Top Gun Contest.

I could have spent last Sunday working on her but spent 6 hours flying

My workbench is full of other projects to finish to boot

Cheers,

Gord.
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Old 10-08-2008, 12:26 PM
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Sounds like the project that will never end!! Just curious, my e-flite 110 calls for a 85amp esc and you are purchasing a 100amp for your 60. Why such a big ESC? Can't wait to see how she turns out. BTW - I just started to put together the wings :-) Thanks again for sharing your comment.

Ron
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Old 10-12-2008, 07:11 AM
  #25  
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Hi Ron,

Sorry for the late response but I was busy getting my Sapac F22 ready for today's maiden :-) , I am glad to say that it was a success, she has good vertical not unlimited but not bad, good enough for huge loops. The other club members were impressed.

Anyways...I could get away with probably a 80amp ESC but my friend has a Turnigy 100amp ESC for sale at a decent price. I was thinking of getting a Castle Creations 80 but it's about $150.00 the HV version is about $200.00

So I am saving a few bucks.

I believe I am close to applying it's first coat of primer soon...just a few more hours on sanding.

How is your build coming along?

Gord.
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