1/3 Scale P-51

Why not share your information on your latest creation
David Brown
Posts: 367
Joined: November 10th, 2009, 8:24 pm
Location: Burton-on-Trent
Contact:

1/3 Scale P-51

Postby David Brown » November 17th, 2018, 2:12 pm

I purchased this project at the Nats in 2017. Having instructed my fellow modeling friends not to let me buy another big project they let me down badly. Its in need of some major TLC and strengthening around the wing area, I am told it has flown on a 150 twin but i have a 250 to graft into it with a reduction drive to swing a big prop similar to my 1/3 Spit set up. The wings are being changed to a 3 piece set up instead of the original 2 piece, a big alloy reinforcing blade has been machined to strengthen the center section and tubes will attach the wing tips. Retracts are started which are very similar to the spit ones I made and tried for size, naturally the legs will not be the same.
Attachments
P51eng1.jpg
P51eng1.jpg (81.29 KiB) Viewed 2479 times
P51w6.jpg
P51w6.jpg (97.16 KiB) Viewed 2479 times
P51w1.jpg
P51w1.jpg (78.05 KiB) Viewed 2479 times
P51w2.jpg
P51w2.jpg (69.51 KiB) Viewed 2479 times
P51eng2.jpg
P51eng2.jpg (86.54 KiB) Viewed 2479 times
P51uc1.jpg
P51uc1.jpg (99.09 KiB) Viewed 2479 times
P51uc2.jpg
P51uc2.jpg (96.59 KiB) Viewed 2479 times

David Brown
Posts: 367
Joined: November 10th, 2009, 8:24 pm
Location: Burton-on-Trent
Contact:

Re: 1/3 Scale P-51

Postby David Brown » November 17th, 2018, 2:19 pm

The engine has now been modified to fit with a reduction of 2 to 1 swinging a 40 X 26 prop for running in. There are just a couple of small jobs to do before I can run it up one of which is a tie bar from the prop driver mount to the bulkhead.
Attachments
P51-5.jpg
P51-5.jpg (74.91 KiB) Viewed 2477 times
P51-6.jpg
P51-6.jpg (77.58 KiB) Viewed 2477 times
P51-7.jpg
P51-7.jpg (70.69 KiB) Viewed 2477 times
P51-9.jpg
P51-9.jpg (74.26 KiB) Viewed 2477 times
P51-8.jpg
P51-8.jpg (70.48 KiB) Viewed 2477 times
P51eng9.jpg
P51eng9.jpg (87.9 KiB) Viewed 2477 times
P51eng10.jpg
P51eng10.jpg (77.21 KiB) Viewed 2477 times

Colin Deery
Posts: 12
Joined: July 27th, 2011, 8:13 pm
Contact:

Re: 1/3 Scale P-51

Postby Colin Deery » November 22nd, 2018, 12:05 pm

Hi Dave, is the reduction drive unit manufactured by yourself?

David Brown
Posts: 367
Joined: November 10th, 2009, 8:24 pm
Location: Burton-on-Trent
Contact:

Re: 1/3 Scale P-51

Postby David Brown » November 29th, 2018, 2:57 pm

Yes Colin, I have my own CNC business and its one of the perks of the job. I purchased Solid works this year and it has made making these sort of projects a lot easier than when I designed them on the back of a fag packet.

Colin Deery
Posts: 12
Joined: July 27th, 2011, 8:13 pm
Contact:

Re: 1/3 Scale P-51

Postby Colin Deery » December 4th, 2018, 12:03 pm

That's good to know Dave.. fantastic looking bit of engineering!
I have a 1/3 scale model which has a 3/1 reduction unit powered by a Zenoah 62.
From memory the scale prop is around 38 inch. The engine is reversed so the prop swings clockwise.
Can a unit be manufactured for most engines? will the bearings need up graded to cope?
Colin.

David Brown
Posts: 367
Joined: November 10th, 2009, 8:24 pm
Location: Burton-on-Trent
Contact:

Re: 1/3 Scale P-51

Postby David Brown » December 4th, 2018, 2:17 pm

Not all engines are suitable and in many cases the front bearings can cope, with my Zenoah projects I add a second bearing to give added support due to the crank design.

Daniel Jacquinot
Posts: 5
Joined: August 31st, 2015, 3:05 pm
Contact:

Re: 1/3 Scale P-51

Postby Daniel Jacquinot » October 28th, 2019, 7:17 am

Hi David,
What is the belt type used on your reduction drive ??
Thanks
Daniel

Geoff Pearce
Posts: 15
Joined: March 14th, 2014, 5:11 pm
Location: Wiltshire
Contact:

Re: 1/3 Scale P-51

Postby Geoff Pearce » November 12th, 2019, 5:32 pm

Envious ! Nice job

David Brown
Posts: 367
Joined: November 10th, 2009, 8:24 pm
Location: Burton-on-Trent
Contact:

Re: 1/3 Scale P-51

Postby David Brown » January 19th, 2020, 11:17 am

Hi Daniel, I use a polly V belt J section and choose the number of ribs you need

David Brown
Posts: 367
Joined: November 10th, 2009, 8:24 pm
Location: Burton-on-Trent
Contact:

Re: 1/3 Scale P-51

Postby David Brown » January 19th, 2020, 11:32 am

I have now made the new tail feathers to the point of fitting new wing tubes as I could not get a replacement tube to suit the existing set up. As fit the engine, this has had a major strip and rebuild. ZDZ seem to be a jinks with me. This engine was new direct from the factory but arrived with no ignition and after several mails I still do not have one. To top it off when I removed the heads to turn them 90 degrees for cooling I found other issues. The pistons were marked on the top where during initial test runs at the factory they had hit the heads, these had been remachined as there are no marks on them. Next I found that the pistons were stroking 1.7mm below the exhaust ports so this was wasted stroke. I have now remachined the barrels and crankcase to get the deck height correct and shimmed the heads to suit. She is now reassembled and ready to test run.
Attachments
11D61AB4-8530-4797-A38D-2449BFD6307A.jpeg
11D61AB4-8530-4797-A38D-2449BFD6307A.jpeg (28.18 KiB) Viewed 206 times
8A91EB5E-F721-4617-8B89-18A65C29B6C0.jpeg
8A91EB5E-F721-4617-8B89-18A65C29B6C0.jpeg (34.31 KiB) Viewed 206 times
BC6386FB-BED3-4C6D-95A0-FC4A92DD650C.jpeg
BC6386FB-BED3-4C6D-95A0-FC4A92DD650C.jpeg (26.38 KiB) Viewed 206 times
ED50189B-521B-4D92-8B4B-F01F4644D3F4.jpeg
ED50189B-521B-4D92-8B4B-F01F4644D3F4.jpeg (27.91 KiB) Viewed 206 times
DB981989-116B-42D9-9376-9A8A5B1D3882.jpeg
DB981989-116B-42D9-9376-9A8A5B1D3882.jpeg (31.22 KiB) Viewed 206 times

Cary Bailey
Posts: 230
Joined: January 26th, 2011, 7:43 am
Location: Stoke On Trent
Contact:

Re: 1/3 Scale P-51

Postby Cary Bailey » January 21st, 2020, 9:03 am

Nice work Mr B!
Cary


Return to “Your New Projects”

Who is online

Users browsing this forum: No registered users and 1 guest