GTM 1/3 Fokker D-7 - Page 29 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-11-2014, 07:16 AM   #281
SteveD
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Re: GTM 1/3 Fokker D-7


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Awesome engine,the Valach 120 in-line.I just put a deposit on one.Should be getting it by the end of next month.I think the 120 will pull it around the sky no problem.Plus I could just let it sit there in the pits idling loving that sound that it makes...
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Old 10-11-2014, 06:18 PM   #282
mR JoLLy
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Re: GTM 1/3 Fokker D-7

A very nice engine choice Steve. It will be interesting to see you shoe horn that one in

As promised I have taken a few pictures of the cable runs. The servo's are mounted at the front of the model and transfer to the wires under the cockpit floor. At the rear of the cockpit floor there is a ply, balsa, ply sandwich mounted between the wing crutch plates. Installed into this "beam" are 1/8" brass tube to guide the wire onward to the control surfaces.

At the moment I am using thread to set things up so they are not too visible. If you look at the pictures closely you can see the route from the servo's to the controls at the rear.

The main reason for setting everything up was to map where the cables pass through fabric so I can cut in the right places after the frame is covered.

Nigel
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Old 10-11-2014, 07:29 PM   #283
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Re: GTM 1/3 Fokker D-7

Oh it will fit nicely enough Nigel,of course I have to do some firewall mods and I may have to trim the dummy engine some.Nice job on the cables.. I'm guessing you'll have a servo access hatch on the bottom?
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Old 10-12-2014, 02:47 AM   #284
mR JoLLy
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Re: GTM 1/3 Fokker D-7

Yes Steve, the servos are basically under the metal panel so access will be easy enough.

I have done the servo installation this way as it add less total weight to the model around the balance point. The beam and tubes plus a bit for the glue only added 65g.

The servos were going to drive bell cranks and then the cables, but I am going to drive the cables straight from the servos now to save more weight. I don't think it will be a problem, the loads will be very low compared to smaller, faster models.

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Old 10-12-2014, 07:23 AM   #285
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Re: GTM 1/3 Fokker D-7

Nigel,
good job with the cables. After I had decided the cockpit controls would NOT move with the throws of the servos I installed it like this.....

Steve,
I know the feeling when you have decided for an engine like that!
Last year Santa brought a Moki 250 radial for my 1/3 PT17.....

So we are very excited to see this engine in your DVII in the not too distant future!

Tilmann
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Old 10-12-2014, 08:06 AM   #286
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Re: GTM 1/3 Fokker D-7

Thanks guys for those pics,I think I'll go with a simple setup like Tilmanns.Hopefully I wont have to add much nose ballast...
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Old 10-12-2014, 08:49 AM   #287
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Re: GTM 1/3 Fokker D-7

I agree that we don't want to be running the control sticks of the model. I recall Steve and I may have discussed running the controls some time ago, but it's a practice I have not, and will never entertain. Complexity of such an exercise not worth it IMHO!

If I was not paranoid about weight I probably would have installed under the pilot's seat also. It just so happens that installing the way I have results in a lower AUW.

Tilmann, I still think I am going to be over 25 Kg, so I am altering anything I can to reduce weight without compromising on detail. The oldest scale problem I guess!

Finishing off the front end shelves and boxes today so I can do a final painting this week of the parts that need it.
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Old 10-12-2014, 09:15 AM   #288
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Re: GTM 1/3 Fokker D-7

Steve,
don't be too afraid of ballast! Remember: forget about the CG given in the plans!
CG is between 173 and 210mm behind upper wing's leading edge!
I started out with 190mm and she is flying wonderfully. Nevertheless I will go further back with CG during the winter to 200mm in order to get even better flare out attitude and a bit more agility to ailerons. With 190 I am definitely still on the noseheavy side. So - no fear!
I have 2.4kg ballast with the 190mm which I think is fine in a model this size.

Nigel,
fingers crossed you'll stay below 25 even though this is not a limit weight in the UK, is it?Tilmann
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Old 10-12-2014, 09:33 AM   #289
mR JoLLy
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Re: GTM 1/3 Fokker D-7

Tillmann, 20Kg limit in the UK, but I might like to take the D.VII to the mainland in the future and fly in Germany, France etc. I understand the tipping point is 25Kg with a full tank of fuel. That is a complexity I really could do without to be honest !

It will be interesting to see how it flies at 200mm

I am sure Steve has fewer AUW issues to worry about with 2 full built up wings.

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Old 10-12-2014, 03:14 PM   #290
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Re: GTM 1/3 Fokker D-7

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Originally Posted by mR JoLLy View Post
Tillmann, 20Kg limit in the UK, but I might like to fake here to the mainland in the future and fly in Germany, France etc. I understand the tipping point is 25Kg with a full tank of fuel. That is a complexity I really could do without to be honest !

It will be interesting to see how it flies at 200mm

I am sure Steve has fewer AUW issues to worry about with 2 full built up wings.
Also Nigel I'm going with a lighter covering,Balsa USA Lozengetex on the wings and Solartex on the fuse..
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