GTM 1/3 Fokker D-7 - Page 25 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-05-2014, 09:49 AM   #241
mR JoLLy
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Re: GTM 1/3 Fokker D-7


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Steve, I am working on that problem right now. I am installing the servo tray and making a slightly larger door so the servo can be removed should it be necessary.

The push rod Idea is in there, but I am also wanting it to appear correct so the thinking cap is currently on for this very topic
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Old 09-16-2014, 05:05 PM   #242
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Re: GTM 1/3 Fokker D-7

Time to get back at the D7,it's been awhile.I had a pretty uneventful flying season although I did attend two IMAC meets.After the Aug 1st meet I haven't flown at all.I'm not sure why,although the weather hasn't been the greatest...
Anyway its time to get back at the D7 and I've made a change on the engine of choice for this one.Today I just ordered a Roto 85cc 4 stroke 2cyl inline engine from AMR.It will turn a 27x8 prop around 5200 rpm.Now I dont have to worry about the hard starting Zen62 on a redrive and the cannister muffler it would need to keep the noise down to an acceptable level'The Roto 85 sounds more realistic...
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Old 09-16-2014, 05:09 PM   #243
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Re: GTM 1/3 Fokker D-7

Looks like a great engine and being four stroke the sound will be much better than the G62. I always look forward to updates on this build.
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Old 09-16-2014, 08:28 PM   #244
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Re: GTM 1/3 Fokker D-7

Yes its a fascinating engine .I seen a Kolm 135 inline in a 1/3 BUSA D7 on U Tube and it seemed a bit overpowered.And its a way more expensive than the Roto 85.Even the Kolm 100 inline is a lot more.
/www.youtube.com/watch?v=eJ7mhIPcNY8
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Old 09-17-2014, 02:27 AM   #245
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Re: GTM 1/3 Fokker D-7

He's back . . . . YAY!

Interesting change of direction Steve. It will be most intriguing to see how it performs. Will you have to move the firewall for this engine??

You may recall Tilmann who put a few posts on this thread earlier. His D.VII is flying with an AUW of 23.5Kg. 2.9 Kg of ballast in the nose!

Here is a video of it flying on what looks like a less than perfect day.

https://www.youtube.com/watch?v=8BiI...ature=youtu.be

I am currently doping my wings at the moment and stripping the fuselage out for covering.
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Old 09-17-2014, 07:34 AM   #246
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Re: GTM 1/3 Fokker D-7

Hi Nigel;I believe I have to move the firewall a 1/2 or 3/4" back,simple enough to do.I'm a bit surprised at Tilmanns weight(51.8lbs) on his Fokker,doesn't that seem a bit high for a GTM model?Six pounds in the nose sounds normal enough.Tell me did you go pull pull on the ailerons?any pics of that?
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Old 09-17-2014, 08:05 AM   #247
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Re: GTM 1/3 Fokker D-7

The weight is on the money for the D.VII from what I understand. I expect to have a little more on that because I have used more wing tubes, the guns weigh a little more etc. I am re-thinking the internals at the moment to bring everything as far forward as possible. I am hoping I don't have to add that much lead, but we will see.

The Ailerons will be Pull:Pull, but I have just looked for pictures of the installation and I can't see any!! I can't do anything at the moment because the top fabric is getting doped up. When everything is cut out and installed I will take a picture for you which will be in a week or so.

I moved my firewall no problem myself when the size of shim on the prop shaft was reduced!



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Old 09-19-2014, 06:35 AM   #248
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Re: GTM 1/3 Fokker D-7

Something I have just discovered is the plans show the guns with approx 80 mm of separation. In actual fact they should be 100mm separation. Guess what . . . the ammo box fits perfectly as supplied if you move the guns to these positions.

Having modified the chutes like you I am going to rework them again so I can get everything fitting as accurately as possible. Normally I would not bother but I am going commercial with the guns so need to get everything right. I discovered the problem when drawing the belt return tubes and could not fit the right hand guns tubes in.

It will be a few days work from what I can see because the mounts for the guns will need relocating also!

Boo Hiss!
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Old 09-21-2014, 06:47 AM   #249
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Re: GTM 1/3 Fokker D-7

Hi again,
it's a while ago that I wrote here last. In the meantime my GTM Fokker DVII had her maiden and was the showstealer at a Dawn-Patrol like event last week.
I am very happy with the final result even though the road was long and winding (as I coined it in a building thread in RCSCALEBUILDER.com). Glenn called it "a bumpy road". True.
Nevertheless the result is outstanding.

Steve, the weight Nigel is talking about is pretty exactly what Glenn told me his prototype was weighing in at. It is - btw - exactly 23.4kg - having 2.7 ballast in the nose. This means a CG which is FAR behind the one Glenn is recommending in the plans!
And the bird still is noseheavy!
I will remove another 400g. The computer application "WinLaengs 4.0." spit out 170mm to 210mm behind top wing's leading edge! I flew her at 190 so far. Very comfortable this way but I could use a bit more bite .

Re the ailerons I will put pics to my RCSB thread pretty soon. As of now: I could not imagine a pull pull setting and still being able to tighten the cables properly (where to put any turnbuckle???)!
So I opted for a solid rod on the underside (which you can never see anyway) and a dummy, spring loaded, cable which immerges into the leather protected opening on the top side. Works flawlessly and is looking absolutely scale like.

One more thing: you wrote:>>to worry about the hard starting Zen62 on a redrive<<.
Who told you that?
This is it:choke closed, throttle fully open, five to ten flips until first ignitions, choke open, throttle closed and the ZG62 will start after three more flips the latest - ALWAYS!

Cheers
Tilmann

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Old 09-21-2014, 12:16 PM   #250
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Re: GTM 1/3 Fokker D-7

Nice work Tillman;Interesting stuff about the CG location and the nose weight.I read somewhere that the z62 was hard to start on a redrive unless it was well broken in.I have a new z62 and right now its hard to start,I guess i need to break it in some more.Is yours a regular z62 or do you have electric/battery ignition?Also are you using the Zimmermann exhaust canister?Its very quietI'll do some more breaking in on mine and see how it goes,maybe I'll get an elec/ignition for it.I was going to use a solid rod on the bottom and dummy cable on top also,but haven't figured out how to adapt a connection between the rod and the scale carbon fibre bellcrank.
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