Parkflyers International A-10 Thunderbolt II G1R: Learning Process That Leads to More Excitements

Discussion in 'Scratchbuilding!' started by bimoadiprakoso, Oct 24, 2018.

  1. bimoadiprakoso

    bimoadiprakoso Top Gun

    Posts:
    4,917
    Likes:
    12,926
    Points:
    133
    The Fairchild Republic A-10 Thunderbolt II is a single-seat, twin turbofan engine, straight wing jet aircraft developed by Fairchild-Republic for the United States Air Force (USAF). Commonly referred to by the nicknames "Warthog" or "Hog", its official name comes from the Republic P-47 Thunderbolt, a World War II fighter-bomber effective at attacking ground targets. The A-10 was designed for close air support (CAS) of friendly ground troops, attacking armored vehicles and tanks, and providing quick-action support against enemy ground forces. It entered service in 1976 and is the only production-built aircraft that has served in the USAF that was designed solely for CAS. Its secondary mission is to provide forward air controller – airborne (FAC-A) support, by directing other aircraft in attacks on ground targets. Aircraft used primarily in this role are designated OA-10.

    The A-10A single-seat variant was the only version produced, though one pre-production airframe was modified into the YA-10B twin-seat prototype to test an all-weather night capable version. In 2005, a program was started to upgrade remaining A-10A aircraft to the A-10C configuration, with modern avionics for use with precision weaponry. The U.S. Air Force had stated the F-35 would replace the A-10 as it entered service, but this remains highly contentious within the USAF and in political circles. With a variety of upgrades and wing replacements, the A-10's service life can be extended to 2040; the service has no planned retirement date as of June 2017.

    Source: Wikipedia

    A-10-3.jpg

    All of us were having a casual discussion on what we would have for our next project. Since we have a series of jetfighter parkjets (SU-30SM, F/A-18, F-14D, F-15SE, etc.) we would like to do something different like the Aeronce L3 Tourer. After couple of calls, we decided to go with A-10 Thunderbolt II.

    However, at the discussion stage, we addressed some potential challenges which might lead us to some issues when simplifying the design. Some of them were:
    1. Dihedral wing. Many planes with dihedral wing tend to need some reinforcements that would include using plywood or carbon spars. We were thinking about it as well, but we wanted to simplify things so intermediate builders would be able to construct it.
    2. Angle of incidence on the wings, horizontal stabilizers, thrust line, as well as dummy engines (oh, we decided to go with rear pusher but Wildthing was experimenting with larger size using pusher props on both engines. We had questions if this really necessary to apply as we hadn't got any idea on how this would influence the plane.
    3. Most storebought A-10s has wide wingspan (above 1,000cm) that will give it a bit of an issue if we're designing large one. Not all builders have SUVs to transport the plane.

    So, with some other considerations, we then came up with some basic approach on how the A-10 would become:
    1. We'd try not to reply on carbon spars nor plywood, but mostly on fiber tapes and hotglue. We experimented on how the hotglue should be applied to construct the dihedral wing, specially the mid and outer wing joints. The wing profile would also mimic the real A-10's airfoil.
    2. We would like to apply all angle of incidence on each part (wings, horizontal stabilizers, dummy engines and thrust line and have a look at the effects closely.
    3. As for how wide is the wingspan, we tried to combine the wing area calculation of the F/A-18, SU-30SM and F-14D and try to define the safe zone of the wing area and wingloading figures. We then came up with 890cm wingspan that had wing area in between those earlier parkjets mentioned. So, we knew that it wouldn't be that big but it should have similar wing loading to our other parkjets.

    We started to model the A-10 in Rhinoceros 6 on HP Workstation. As we completely realized, at that time, we really lack of knowledge on how all scaled down parameters would do with the plane, particularly the A-10, we tested the 3D model we did in Rhinoceros, using free open source CFD (Computational Fluid Dynamics) simulation software, OpenFOAM. We did few sections simulation first before having the full model computed. The result seemed to be raising our confidence to move forward.

    Some of you might have seen some sneak peak pics and information that we're working on this project on other threads. So, these are some images of the A-10, designed in Rhinoceros.

    upload_2018-10-25_12-56-16.png

    upload_2018-10-25_12-56-46.png

    upload_2018-10-25_12-58-2.png

    We love to learn and keep the joy flowing. Stay tuned everyone :)

    Parkflyers International Parkjets

    My Scratchbuilding Journey

    Google+
     
  2. The start of a new bird. Trying out the new to me Value XPS foam , comes in 24" X 48" sheets and this new guy took about 1 1/2 sheets so not a ton of parts to cut out.



    2018_1014_201009_001.JPG 2018_1015_045012_001.JPG 2018_1015_045020_002.JPG
     
  3. andy_downs

    andy_downs Ace Pilot

    Posts:
    862
    Likes:
    2,409
    Points:
    93
    just to keep every one excited.
     
  4. Fuselage going together. This guy is actually a very simple build.

    2018_1015_062219_001.JPG 2018_1015_062226_002.JPG
     
  5. bimoadiprakoso

    bimoadiprakoso Top Gun

    Posts:
    4,917
    Likes:
    12,926
    Points:
    133
    Last edited: Oct 25, 2018
    lysle42, andy_downs and Wildthing like this.
  6. jimbosflyin

    jimbosflyin Top Gun

    Posts:
    1,393
    Likes:
    3,905
    Points:
    113
  7. That is down right sexy Jimbo.
     
  8. jimbosflyin

    jimbosflyin Top Gun

    Posts:
    1,393
    Likes:
    3,905
    Points:
    113
    Flies awsome and I didn't crash it.One of my faves.
     
  9. Flybyknight22

    Flybyknight22 Top Gun

    Posts:
    2,929
    Likes:
    6,452
    Points:
    133
    Hey Jeff,
    Tell me about this “XPS” foam?

    Does it compare to depron, MPF?

    I’m sure there must be mention of it in a thread somewhere but I’ve slept since then.
     
  10. I have never used MPF foam yet but I think it along the same line as it. So far to work with , cutting and folding seems really good. It does have a little rougher surface to it though. Sheet size is 24"X48"
     
  11. Wing is together with the wheel pods, fuse is done other then the bottom plate which goes on last after all the electronics are ran and in. The engines are together, these were the toughest part of the build ;) .

    2018_1015_150523_001.JPG 2018_1015_150526_002.JPG 2018_1015_150532_003.JPG
     
  12. Dry fit , little bit of extra planning to run the wiring but otherwise a relatively easy build. 2018_1015_154741_003.JPG 2018_1015_154750_004.JPG 2018_1015_154806_005.JPG
     
  13. homey666

    homey666 Top Gun

    Posts:
    1,644
    Likes:
    4,981
    Points:
    113
  14. It's pretty cool, the only cf reinforcements are in the verticals and the horizontal plate and all I used was 3mm cf strips and UHU Por, no epoxy.

    Sorry some short strips in the engine mounts to.
     
  15. jimbosflyin

    jimbosflyin Top Gun

    Posts:
    1,393
    Likes:
    3,905
    Points:
    113
    I'll be starting #2 of mine shortly,started painting #1 this morning.:confused:
     
  16. That paint booth must never shut down, mine is always hard to find. LOL
     
  17. Hardware is all in, had to hollow out the canopy a bit to fit my 1800 4S battery, those other guys are only doing 3S. :D :D Esc has fresh are, wheel pods are the low point. 2018_1018_082706_003.JPG 2018_1018_082721_004.JPG 2018_1022_174430_001.JPG
     
  18. jimbosflyin

    jimbosflyin Top Gun

    Posts:
    1,393
    Likes:
    3,905
    Points:
    113
    I had to hollow out mine for the 3s also,I still think we need more room in there Jeff.
     
  19. And this was the maiden of the PI A-10. I can't believe how well it flies, I was expecting loops and massive torque roll, something to that effect but it launched just beautiful.

    I was going to test it again today in higher winds, went out to the field and when I left the winds were around 25 to 30k. I get there and sitting still in the truck and the truck starts rocking, check the wind because we have our little weather station there and it is now 40k. So I play a couple games of Kaiser (Canadian game) and check again and now it's up to 55k, that's it I am going home. ;)

     
  20. FlyteTime

    FlyteTime Ace Pilot

    Posts:
    777
    Likes:
    2,239
    Points:
    93

Share This Page

string(1) "1"