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Sukhoi Su-17 M4 "Fitter", 1/6 Scale Project

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Sukhoi Su-17 M4 "Fitter", 1/6 Scale Project

Old 04-20-2022, 06:26 PM
  #151  
Ron S
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Jim McEwen was a big help in reorganizing my monolithic scale documentation into something more digestible to scale judges... Thanks Jim!
Putin never responded to my plea for Fitter pics... I guess he's busy right now with other things.
Pics are very limited on this (somewhat obscure for us in the US) aircraft. Either way, my docs are as good as they're gonna get for now.



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Old 04-20-2022, 06:38 PM
  #152  
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Not sure if it has been posted before but a good link for Russian walk arounds is,

????? 1950 (After 1950)

Should find more details.

Regards,
Old 04-20-2022, 07:42 PM
  #153  
Ron S
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Yes Halcyon, I've been to that website before. They're out there... Just have to do your google searching...
Old 04-20-2022, 07:47 PM
  #154  
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In this case don't Google, Yandex

https://yandex.ru/images/search?text...45&source=serp

Яндекс (yandex.ru)

Regards,

Old 04-21-2022, 05:23 AM
  #155  
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Default Su-17 Model and Documentation

Originally Posted by Ron S View Post
Jim McEwen was a big help in reorganizing my monolithic scale documentation into something more digestible to scale judges... Thanks Jim!
Putin never responded to my plea for Fitter pics... I guess he's busy right now with other things.
Pics are very limited on this (somewhat obscure for us in the US) aircraft. Either way, my docs are as good as they're gonna get for now.

Ron, you are more than welcome! I will enjoy seeing you and your incredible plane at Top Gun. Good luck to you and a hearty Well Done!

Jim
Old 04-22-2022, 05:16 PM
  #156  
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I was fortunate to see photos of Ronís build seeing the airplane in person and Flying was quite a treat today!
Old 04-22-2022, 06:22 PM
  #157  
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She’s a real beauty isn’t she Clark?
Old 04-23-2022, 05:52 AM
  #158  
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you may as well use those access panels for trophy mounts. LOL
Old 07-20-2022, 04:33 AM
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I'm gonna restart this thread, to do some followup on Fitter #2.

When I started this build, my plan (without thinking about it too much) was to build enough parts for 2 models. I did this, until I realized this would slow down airplane #1 significantly, and I also just did not have the space, for all the additional parts. I also realized any lessons learned, or improvements from Fitter #1, might not be able to be added into Fitter #2, so I stopped on Fitter #2.

So for Fitter #2, I have all parts for the aft fuselage assembly, all upper fuselage hatches, and all control surfaces.

What remains, is to make new inboard and outboard wing panels, slats, and the majority of the forward fuselage. I have most landing gear parts, but I suspect I'll be making some new parts for the gear (I want to change the tire build design), and might skim some material off the struts for more lightness).

So all of this started up again about a month ago.
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Old 07-20-2022, 04:42 AM
  #160  
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So I decided it would make sense to start on the Fitter2 Outboard wings first. That way, since I have all the TE control surfaces, I would just need to make the slats, then I would quickly (?) have full up outboard wing panels. I can't save weight on any control surfaces at this point, but I CAN save a bit of weight on the outboard wing internal structure, by increasing size of some of the lightening holes, or making more.

Also, we have a lot of heat down here in Texas this month, so I probably won't be flying much. That means I'll have some time to try to hit this thing hard. Away we go...


LH outboard wing made. Getting ready to close up the Fitter2 RH outboard wing.


Starting to bag Fitter2 Slat parts

Slats installed, and pulled out of the outboard wing slightly. The slat build and install went a bit more quickly, relative to Fitter1. Previously made control surfaces and associated hingeplates installed here.


Last edited by Ron S; 07-20-2022 at 04:50 AM. Reason: adding pics
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Old 07-20-2022, 04:57 AM
  #161  
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I now have all parts for the outboard wings for Fitter2. Left will be to do any fitting adjustments, servo covers, and a lot of little stuff, but since the parts are all fitting, I'm gonna put these assemblies aside, and jump on the inboard wing skins. Cloth all cut to size, and these layups will begin today.


Cutting out the carbon fiber reinforcements


Fiberglass pile for the inboard wings. chop chop...

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Old 07-20-2022, 05:09 AM
  #162  
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What happened to Fitter1 ??
Old 07-20-2022, 06:22 AM
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Nothing just making kit #2
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Old 07-20-2022, 07:32 AM
  #164  
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Yes- Fitter1 is just waiting for nicer weather. I guess I could have brought it to Ky Jets, but really the plan had been to get going on #2 soon.
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Old 07-20-2022, 07:50 AM
  #165  
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Looking good Ron.

Curious what weight CF and FIiberglass your using? I just made up some fiberglass Nacelle fairings for a 1/4 Beech Starship and was able to shed over a pound of weight between the two of them by replacing 2 layers of 6oz glass w/ 4 layers of 1.4oz glass (6 layers total). The panels became a bit flimsy, but internal structure fixed that. If your using 3k (6oz) CF, you could lose some weight replacing that with some Spread tow CF along the entire skin (with less 6oz glass, assuming that is what you are using) and then a layer of uni-CF tape over the wing spars.
Old 07-20-2022, 11:49 AM
  #166  
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Hi Thomas,

the black stuff I’m using is actually 1k carbon cloth. I have some 3k, and I may have used some on my first Fitter H tail, but I think the 1k is sufficient.

Instead of using CF tow, I'm using pultruded CF strips of varying sizes depending on where they’re located. They’re usage is mostly inboard, since that is where the higher bending loads are.

Many of my parts were laid up with 3/4 oz, 2, 4, 6 oz, then 1k CF cloth from LE to just past the high point of the airfoil. It does vary some, due to the shape of the parts. For instance, on the outboard wing panels, I continue the CF as a strip outboard that runs above/below the plywood spar, to create more of an I-beam concept. On my slats I just laid up, my existing pair seem pretty rigid, so I replaced the last 6 oz layer with a 4 oz layer.

I'm using the first model as a baseline since I know it works; and will try to improve it from there on Fitter2.

On Fitter1, the final buildup included 6 ejector racks. The first 4 I made were a bit on the heavy side - I could probably save 2-3 oz by redoing them. The last 2 I made, that mount on the fuselage, were quite lightweight. One thing I wish I had done earlier on was to track the individual part weights, before primer. But when you get into build mode, some times you don't want to stop...

Another thing I want to try is the next size larger linear servo for the wing sweep. I've had no problems so far, but when you're flying, it would be nicer if I could sweep the wings quicker. I think I'm using the Actuonix L12s, but I think I can get some L16s in there - I know they're a slight amount longer...

Last edited by Ron S; 07-20-2022 at 07:03 PM. Reason: added layup schedule
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Old 07-25-2022, 04:20 PM
  #167  
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I just finished trimming the inboard wing skins for Fitter2. The layups went well - maybe a bit more uniform than on the first model (Fitter1). Also dug out the parts for the inboard wing internal structure, and will begin structure buildup in the coming days. These parts were laser cut at the same time when I had Fitter1 parts cut out. This time though, I went through each part and decided if there's any dead weight material that isn't really contributing to carrying load. Or if any access holes could be enlarged. So I spent a half a day with my Dremels, and started trimming away what I think is excess material. Then I updated my cad files so if there's a Fitter3, I won't have to go thru this routine again (I'll have updated files for laser cutting).


New inboard skins all trimmed up (for now).


Some of the structural parts that will get assembled.
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