Author Topic: COMPLETED - 'Skeletal' Fokker D.VII  (Read 5951 times)

Offline RAGIII

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Re: Fokker pair 2
« Reply #120 on: May 30, 2019, 09:06:19 AM »
I can't say enough about just how awesome this looks!
RAGIII
"A man has to know his limitations": Harry Callahan

"Don't slop it on" Lynda Geisler

Offline Terri

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Re: Fokker pair 2
« Reply #121 on: June 01, 2019, 10:18:46 PM »
I'm hanging up my tool belt and walking away from bench and getting out of the hobby , this is killer !




Terri

Offline Mike 'Sandbagger' Norris

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Re: Fokker pair 2
« Reply #122 on: June 01, 2019, 11:44:14 PM »
Hi all,
The upper wing has been assembled and the plywood 'saw tooth' fairing added,

Mike



Served in the RAF for 27 years - now a retired Military Aerospace Technical Author

Offline RAGIII

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Re: Fokker pair 2
« Reply #123 on: June 02, 2019, 02:44:24 AM »
Great start on the upper wing.
RAGIII
"A man has to know his limitations": Harry Callahan

"Don't slop it on" Lynda Geisler

Offline Mike 'Sandbagger' Norris

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Re: Fokker pair 2
« Reply #124 on: June 03, 2019, 06:19:14 AM »
Ok - I need help if there is anyone out there who can explain how the interaction of the aileron control cables works, as I can't find any details of this.

This I know:
1. At the forward end of the control column torque tube is a staggered double bell-crank. Twin aileron control cables are attached to each end of the bell-crank and are routed diagonally across each other to exit through the top of the opposite fuselage side.
2. The twin cables enter the underside of the upper wing, close to the inboard wing strut mounting.
3. The cables are routed around twin pulleys fitted to the rear face of the wing front spar.
4. The cables are the routed outboard to another pair of pulleys, fitted on the spar opposite the aileron control horns.

My problem is that photographs show what I assume are the left inboard pulleys with the two fuselage cables routed around them. One cable is routed outboard I assume to the aileron pulleys. The other is routed in the opposite direction across the wing centre section to presumably the opposite aileron.
However there appears to be a third cable routed horizontally across the top of the twin pulleys and running through a tubular cable housing.
This would seem to suggest that the third cable is interconnected between the two ailerons in some way?

So basically, how were the aileron cables routed across the upper wing and to and from the cockpit bell-crank???
I'm close to completing the skeletal Fokker D.VII and would want to fudge these cables using guesswork,

Mike











Served in the RAF for 27 years - now a retired Military Aerospace Technical Author

Offline RAGIII

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Re: Fokker pair 2
« Reply #125 on: June 03, 2019, 07:23:03 AM »
I don't have your answer but perhaps Bo from Fugzeugwerke can help. He was making a DVII that had the controls rigged to operate by moving the stick. Maybe give him a PM.
RAGIII
"A man has to know his limitations": Harry Callahan

"Don't slop it on" Lynda Geisler

Offline petrov27

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Re: Fokker pair 2
« Reply #126 on: June 03, 2019, 10:07:42 AM »
There is a small diagram on the below, though it is for the DrI, but I think you can just make out the paths of the control cables (wish it were a better scan....)



Offline Mike 'Sandbagger' Norris

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Re: Fokker pair 2
« Reply #127 on: June 03, 2019, 07:13:01 PM »
Thanks guys, particularly 'petrov27' - that diagram was just what I needed.
I hadn't thought of checking other Fokker aircraft drawings!!
The only photos I had were of the left wing pulleys so I assumed the right side pulleys were the same - wrong.
The control cables for the aileron top control horns cross in the wing centre section - I assumed they didn't which is why I couldn't figure out their interaction.
It all makes sense now.



Also Willem 'Makhpiyaluta' at the 'Aerodrome' forum posted this image, which describes the cable routing.



I can move on to finish the build now,

Mike 
« Last Edit: June 03, 2019, 07:29:11 PM by sandbagger »


Served in the RAF for 27 years - now a retired Military Aerospace Technical Author

Offline Mike 'Sandbagger' Norris

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Re: Fokker pair 2
« Reply #128 on: June 05, 2019, 07:06:13 AM »
Hi all,
The upper wing is nearly there.
I just have the ailerons and their control cables and associated pulleys to add, plus the trailing edge wire.
After that it'll be fitting the wing and struts, engine exhaust and propeller, wheels and aileron control cables connected - then that'll be it,


Mike



Served in the RAF for 27 years - now a retired Military Aerospace Technical Author

Offline Juan

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Re: Fokker pair 2
« Reply #129 on: June 05, 2019, 08:56:25 AM »
Mike, with your details, this Fokker would be airworthy if skinned.

Offline pepperman42

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Re: Fokker pair 2
« Reply #130 on: June 05, 2019, 06:12:53 PM »
Amazing work!!

Steve
I was clean,shaved and sober and I didnt care who knew it.

Offline IvotB

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Re: Fokker pair 2
« Reply #131 on: June 05, 2019, 06:13:20 PM »
Mike, this second Fokker is really an impressive project so far. I would say almost finished, but I can't wait to see what's next.

regards,
Ivo

Offline RAGIII

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Re: Fokker pair 2
« Reply #132 on: June 05, 2019, 10:45:02 PM »
Beautiful results on the wing! I am looking forward to the next step!!
RAGIII
"A man has to know his limitations": Harry Callahan

"Don't slop it on" Lynda Geisler

Offline Mike 'Sandbagger' Norris

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Re: Fokker pair 2
« Reply #133 on: June 06, 2019, 06:25:33 AM »
Hi all,
The aileron outer control cable pulleys are fitted.
Made from photo-etch set intended for the Sopwith Triplane and modified to suit the Fokker D.VII pulleys.
The control lines are loosely routed for now.

Next are the inboard pulleys,

Mike



Served in the RAF for 27 years - now a retired Military Aerospace Technical Author

Offline RAGIII

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Re: Fokker pair 2
« Reply #134 on: June 06, 2019, 08:11:22 AM »
This really could be mistaken for the real thing!
RAGIII
"A man has to know his limitations": Harry Callahan

"Don't slop it on" Lynda Geisler