GTM 1/3 Fokker D-7 - Page 23 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 03-23-2014, 09:57 AM   #221
Aida_w
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Re: GTM 1/3 Fokker D-7


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Dave,
what kind of servos do you use for elevator and rudder? Can't read the exact HiTec number?

Where exactly are the two cables from the MG triggers going to?

http://www.rccanada.ca/rccforum/atta...1&d=1395582797


This is my modification of the dummy engine to fit over the ZG62 /Schlundt-gear. Works fine and no problem fitting this kind of powerplant behind the rad and under the dummy...

http://www.rccanada.ca/rccforum/atta...1&d=1395582836

You guys have excellent MG attachments. how did you do those?
Thanks
Tilmann

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Old 04-26-2014, 09:30 PM   #222
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Re: GTM 1/3 Fokker D-7

Hi Tilman;sorry for the late reply,I'm using 5955 hitec servos.i believe those cables go to the gun gear synchronizer at the rear of the engine.The tach also goes there.Your setup looks good.I hope to get back at the D7 soon,I just got my Fokker 1/3 scale wheels in from Williams Brothers.They aren't as fat as the Dubros and come in grey or white rubber which is scale.The mounts for my guns are basically brass tubing and aluminum sheet..
Keep us posted on your D7 Tillman..
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Old 04-27-2014, 10:22 AM   #223
Aida_w
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Re: GTM 1/3 Fokker D-7

Steve,
thanks for your reply!
Your wheels look very nice but my DuBro wheels are finsihed now with all the inscriptions so I won't change them at this stage.

<<Keep us posted on your D7 Tillman..<<
I am near maiden now and of course would share experiences with the GTM kit but it seems as if there would not be too many people here in this forum interested in it, no?
Cheers and thanks again
Tilmann
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Old 04-27-2014, 09:36 PM   #224
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Re: GTM 1/3 Fokker D-7

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Originally Posted by Aida_w View Post
Steve,
thanks for your reply!
Your wheels look very nice but my DuBro wheels are finsihed now with all the inscriptions so I won't change them at this stage.

<<Keep us posted on your D7 Tillman..<<
I am near maiden now and of course would share experiences with the GTM kit but it seems as if there would not be too many people here in this forum interested in it, no?
Cheers and thanks again
Tilmann
Lots of people are interested Tilmann,send some pics and keep us posted...
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Old 04-28-2014, 02:49 AM   #225
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Re: GTM 1/3 Fokker D-7

Steve,
thanks for encouraging. Have to think how to do it AFTER the build instead of an escorting report.
I always wanted to tell you I like your avatar! It's in the Maldives, right? I think this plane took us from Male to our island....
Tilmann
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Old 04-28-2014, 06:42 AM   #226
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Re: GTM 1/3 Fokker D-7

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Originally Posted by Aida_w View Post
Steve,
thanks for encouraging. Have to think how to do it AFTER the build instead of an escorting report.
I always wanted to tell you I like your avatar! It's in the Maldives, right? I think this plane took us from Male to our island....
Tilmann
Ahh yes..the twin otter.one of my next projects.yes thats in the Maldives..
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Old 05-24-2014, 03:24 PM   #227
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Re: GTM 1/3 Fokker D-7

Well Steve I hope all is good out there in Canada. We are enjoying plenty of rain at the moment.

I thought I would just pop a few pictures on, My wings are finished now and ready for covering after their inspection. The top wing with ailerons is 3.5Kg with no covering at all. It would be interesting to know what your top wing weighs with no tubes!

I spent 2 nights patiently setting up the wing struts on the frame to get a smooth final fixing. The parts required a little work to fit but they were pretty good dimension wise.

In the next few weeks I will cover the wings, and work on the mounting for the lower wing which is a little unusual with 2 tubes through the structure.

Catch you later . . . .


Nigel
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Old 05-25-2014, 08:57 PM   #228
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Re: GTM 1/3 Fokker D-7

Nigel, I don't want to derail this thread but I'm interested in your comment that the wings are ready for covering " after they have been inspected". Do you have to get large planes inspected during the build process? Who does the inspection? Cost?
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Old 05-26-2014, 05:10 AM   #229
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Re: GTM 1/3 Fokker D-7

Steve,
have you test run the ZG62 on Mick Reeves' gear already? I am asking because I had overheating trouble with the ZG62 on Schlundt gear the other day.
And I would be very interested in your final weight. Mine is 21.7kg without fuel which seems to be ok.
The shock came when I tried to weigh in Glenn's foremost point of CG first: 9kg (!) of lead would have been needed!!!! Even his rear point of CG which is 160mm behind upper wing's LE seems to be too much forward.
By the way - the pro who helped me with the CG said that hanging a model this size from the ceiling to find correct CG (that's what Glenn did) you can change the CG up to 100mm to and fro without seeing any effect! Or the other way round: you can add loads and loads of balast to the nose without seeing the nose going down. Actually you are noseheavy from the beginning in this scenario!
This would explain the above mentioned but CALCULATED (!) 9kg in the first place.
So we defined the CG by the use of scales under each wheel and the skid plus a reference wall and then calculating - and we came to 190mm behind upper wing's LE.
Later the computer programm "WinLaengs 4.0" calculated this as a "medium point of CG" as well. The programm's range for my Fokker DVII is from 173mm being "very, very stable" to 210mm which is "stable but agile". So I went for 190mm to start with.
I have to postpone the maiden due to other chores but I'll keep you posted.

Oh, can you please tell me the difference in weight between the DuBro wheels and the Wiliams Brothers'?
Thanks!

Tilmann
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Old 05-26-2014, 12:21 PM   #230
mR JoLLy
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Re: GTM 1/3 Fokker D-7

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Nigel, I don't want to derail this thread but I'm interested in your comment that the wings are ready for covering " after they have been inspected". Do you have to get large planes inspected during the build process? Who does the inspection? Cost?
Hi there. The UK has a 20Kg limit on model aircraft so anything over that has to go through "inspection" by our CAA. Fortunately there is a large model flying club (the LMA) which has a network of approved inspectors who are themselves model builders.

So if when planning your build and you expect the model to be over 20 kg as I expect with this model you have to register the build and be guided by the inspector. This is the first GTM D.VII in the UK so we spent some time with the plans before building. It costs nothing to you except fuel and time meeting up with the inspectors.

After the model is built the model has to do an hours proving flight which includes a set of appropriate manoeuvres. The model can then only be flown by registered pilots. It sounds complex but it is relatively straight forward in practice.

Hope that explains sufficient for you.

Tillman. Was the model static on the ground when you did the engine run? I have been told that there is a risk of overheating with engines sporting a gear reduction are run up when static. Apparently it's because there is insufficient air running into the cowl from the slow spinning propeller. When flying I think they call it dynamic air flow caused by the forward movement of the model which gives the much needed air flow to cool the engine.

I will see if I can get some more info on this to explain further. Won't be this week as I am on holiday and using a phone to type with which is a pain in itself!

Nigel
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