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By: - 23rd June 2016 at 21:06 Permalink - Edited 1st January 1970 at 01:00
Here are a couple of pics that might be of help.
These courtesy of The Stirling Aircraft Projects FN4.
James
By: - 23rd June 2016 at 21:17 Permalink - Edited 1st January 1970 at 01:00
You don't say what you want the dimensions for - I have many dimensions both measured from the turret and interpreted from the AP - giving rise to this model:
https://www.youtube.com/watch?v=cmu_Ww1HiPw
Also the Turrets AP 1659A is good reference but you seem to have the pic from that already.
Sadly I also had trouble deciding what the diameter actually was, the AP states "Diameter of Ring 34.5" - but is that inside - outside? What ring?
James
By: - 23rd June 2016 at 21:45 Permalink - Edited 1st January 1970 at 01:00
Surely the key parameter for the turret ring diameter is the circular hole that it sits in? Sorry if that's too simple-minded for the compliers of the AP or perhaps even the turret designers?
By: - 23rd June 2016 at 22:25 Permalink - Edited 1st January 1970 at 01:00
I think you meant FN5 James :)
By: - 23rd June 2016 at 23:47 Permalink - Edited 1st January 1970 at 01:00
I think you meant FN5 James :)
Can I claim 'speling mistake'? :apologetic:
James
By: - 24th June 2016 at 07:27 Permalink - Edited 1st January 1970 at 01:00
Can I claim 'speling mistake'? :apologetic:James
Absolutely :)
By: - 26th June 2016 at 18:43 Permalink - Edited 1st January 1970 at 01:00
The internal diameter of the turret ring is 34 .2 inch ,from the bottom of the arch that carries the rotating service joint to the underside of the joint equals 25 7/8 inch plus 2 3/4 inch will take you to the point that you require.
I will post the actual size and thickness of the turret inner ring within the next couple of days..............I hope this is of some help?
By: - 15th February 2020 at 20:27 Permalink - Edited 15th February 2020 at 20:47
Please be aware that the source drawing you have is NOT to scale, and contains many geometry errors. I know this as I had correct numerous errors on my drawings for model turrets. Unfortunately I am unable to answer your specific question accurately, as I changed the upper rotating-joint. I'll see if I can get you an approximation in the coming days.
I've almost finished scratch-building a pair of FN5's to 1:4.5 scale, and am in the process of simplifying the build to build turrets for the RC community, as the current turrets take around 2 years to build. They feature a fully working collimating gunsight with reticule and autodimmer, mechanical linkage of the sight to the elevation of the gun-cradle, and numerous lamps, also doors with working latches, and pneumatically operated gun elevation with (eventual) servo operated traverse. The intention is to mount cameras in the turrets in flight.
I did have to make a few changes to the turret, particularly the fixed/traversing ring, and the rotating joint at the top. Otherwise, they're as accurate as I could make them given the almost complete absence of surviving technical drawings. If you search YouTube for Fidd88 you'll find my channel documenting the builds over time and the "triumphs and disasters" during that period.
https://www.youtube.com/watch?v=fry_xO3JGTo for one film
If I can be of help with FN5 stuff let me know..
By: - 21st February 2020 at 06:00 Permalink
PM sent ?
By: - 21st February 2020 at 08:33 Permalink
Hi
Here's a slightly smaller RC turret!
https://www.youtube.com/watch?v=6BaTLO-K7LU
Cheers
James
By: - 22nd February 2020 at 14:11 Permalink
That turret was designed and built by Helimadken, and was in fact the inspiration for mine. Quite amazing work in 1:10 scale.
By: - 23rd February 2020 at 07:52 Permalink
Hi Fid88
That's right, he used my 3D model to print the parts. While the software I use is mainly for graphics, all of the animation maths is done by the software such that any size model should operate correctly. I do have some models on here under jamesinnewcastl, sadly my old name victim of the 'new' improved web site!
James
By: - 25th February 2020 at 07:55 Permalink - Edited 25th February 2020 at 07:55
Coincidentally I've just measured the Stirling project FN5 turret last week.
The fixed part of the ring that attaches to the airframe gas an external diameter of 38.25".
I can confirm that the inner diameter of the moving part is 34.5".
By: - 27th February 2020 at 18:58 Permalink
Has any body got a spare FN5 turret ring kicking about ?
By: - 27th February 2020 at 22:39 Permalink
got an FN4 but different diameter
By: - 28th February 2020 at 19:08 Permalink
Hi 12Jaguar I could very well be interested in the FN4 turret ring as I have the remains of a FN82 rear turret which is missing its rotation ring , the accommodation base and the cupola and it would not surprise me if the FN4 ring is the same size .
If possible could you send a PM , many thanks
By: - 28th February 2020 at 23:01 Permalink
I would like to thank everyone who has taken the time to investigate and respond to my original post as it appears I haven't till now, much appreciated.
By: - 29th February 2020 at 16:16 Permalink
Hi atb/72 I think I have sent you a pm but not really sure ?
By: - 3rd March 2020 at 13:02 Permalink
Jamesinnewcastle, I've pm'd you, which you may have missed....
Posts: 45
By: atbl12 - 23rd June 2016 at 04:11
Would anyone here be able to provide me the approx height measurement, shown in pic, of the FN5 from top of rotating ring to the cupola seal on the rotating service joint?
Also the inner and outer ring diameters please? It was discussed here http://forum.keypublishing.com/showthread.php?138114-Turret-Rings&p=2299175&highlight=FN5+diameter#post2299175 but there seemed to be a few differences, or if someone can confirm the same size rings were used on the FN11/16 and FN5 turrets
Any help or reference material would be much appreciated.
Cheers