motortommy

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About motortommy

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  • Location Germany

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motortommy's Activity

  1. motortommy added a post in a topic IV fuselage repair - measurements   

    would be great to have some measurements as a cross reference…
    Thanks!
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  2. motortommy added a post in a topic IV fuselage repair - measurements   

    Thanks!
    Unfortunately 4130 tubing is sold out at the moment (Germany)...have to wait.

    Like more pics? Here is the bent mess...

    previous repairman added triangle braces and steel stringers side and bottom, maybe to strengthen his welding skills
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  3. motortommy added a topic in Kitfox IV   

    IV fuselage repair - measurements
    I have a crashed and repaired fuselage. Although the plane has been in service flawlessly for years since then, I don`t like the workmanship of previous owner. Welding is awful, no splices and metric tubes were used. Further additional `improvements´ were made
    Goal is to get the fuselage back in original state as much as possible referring to AC43.13

    1. What is correct tube size (green) of the longerons. OD is 1/2", but unsure about wall?
    2. Does anybody have a bare, undamaged IV fuselage handy and could help me with some measurements in case? No rush!

    • 4 replies
    • 270 views
  4. motortommy added a post in a topic Propeller, IVO, IFA   

    to keep the fire alive, I just throw in the possible candidates, probably some out of the same same mold ;-)
    (combo 582, c-Box 3:1)
    - NR SR83 dia. 1720mm
    - Luga/Kool? dia. 1750mm
    - kiev 183 dia. 1800mm (STOL)
    - kiev 163 dia 1710mm
    Would have already ordered, but so far not clear what`s best replacement for my aged wooden GSC!  
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  5. motortommy added a post in a topic Propeller, IVO, IFA   

    Vladimir,
    what ist the best fit for Rotax 582 using 3:1 gear? your opinion?
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  6. motortommy added a post in a topic WY kitfox Yamaha build   

    nice progress. Thanks for sharing!
    Would you like to share some more info regarding your landing gear, like width and especially tube dimensions front and rear legs...
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  7. motortommy added a post in a topic Fuselage landing loads (Kitfox IV) and cabane gear   

    …after some more research, I understood that with fuselage both leveled and loaded a slight positive camber of 1-2deg is desired while the wheels should be straight or show minimum toe-out. Not decided, if I will go with welded axle tube or adapt a bolt on axle like Grove which would be much easier to adjust via shims…
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  8. motortommy added a post in a topic Fuselage landing loads (Kitfox IV) and cabane gear   

    …so besides the easier fairing issue wrapped bungees also maybe offer more range for adjustment. I really like to build a cub style landing gear as it should be a proven design and knowledge is spread open. What I´m not fully aware of is the correct strength/tension of the bungee setup. To clarify my question I spared no effort and created this high end drawing


    Most airborne cabane gear looks like #2, means there is some ´sag´ when unloaded. Maybe intention is to offer some kind of progression as load builds up? How to find good setup? Do you agree that plane on the ground should more look like #1 (straight) than #3 (empty weight already compressed the gear). Adjustment depends on strut travel, no. of wraps, bungee strength and –preload…

    Hope you get my point...
    (could explain better in native language)
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  9. motortommy added a post in a topic wing spars for Europe   

    ....glad it worked out well for you!
    Please share some pics/insight of your wing rebuild (if you like)
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  10. motortommy added a post in a topic Fuselage landing loads (Kitfox IV) and cabane gear   

     
     
    so what‘s the reason that cub design attaches the bungees 90 deg. bar to bar? Is it because the use of bungee rings? Aligned it would be much easier to create some kind of fairing...
    Any ideas?
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  11. motortommy added a post in a topic wing spars for Europe   

    Yes that`s also my thinking. I´d love to buy from the factory (spar $195) but packing & freight add another $1420 Plus the risk that something stupid could happen during the long journey...
    @Manu: Thanks! will check ULM Tech   
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  12. motortommy added a post in a topic wing spars for Europe   

    might be an option, but to be honest I like to go `genuine factory` with my rebuild. I have already a sleeve I want to get rid of...
     
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  13. motortommy added a post in a topic wing spars for Europe   

    Hi Skelly,
    I´m in need of only one for a mk4, means without extruded stiffener...
    Thanks.
     
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  14. motortommy added a topic in Avid and Kitfox parts Suppliers   

    wing spars for Europe
    as I´m probably in need for a new Kitfox IV spar, I contacted the factory. While pricing for the spar itself would be quite reasonable, transportation costs are infernal.
    So meanwhile I found a mill located in Germany producing following spec.
    2,5"x.065 162"
    EN AW-6061-T6 seamless drawn
    EN 573-3, EN 754-1, 2+7
    EN 10204/3.1
    Where`s the beef? Minumum slot they produce would be 7 pcs. Price would be around EUR 300,- per spar.
    Please PM, if you`re located within Europe and interested.
     
    • 10 replies
    • 446 views
  15. motortommy added a post in a topic New wingtips...   

    So was it worth the effort? Yes and No!

    For the spent money (materials, tools, …) I could have bought likely a set of factory tips, including horrific transatlantic shipping cost. Further it took me roughly 3 months (sure not fulltime) from scratch to finished part, but:

    -        my wingtips were in desolate condition, badly repaired and way too heavy (left 2.3kgs/right 2.7kgs)

    -        even the modern style tips I borrowed still weighed 1.5/1.7kgs

    -        my new parts weigh 1.5 per set, means only by replacing the tips I saved 3.5kgs including preferred new look for free!  

    -        I wanted to try, if I´m still able and willing to work with fiberglass (after having 25years break) as my planning is to touch seatpan, cowling, wingtanks, panel,… as well

    Finally after tearing the whole plane down for months finding more and more issues I didn`t like, it was mentally important to create something gaining strength to proceed with the project. These wingtips were the first new homemade parts I made for my plane…

    OMG it´s difficult to express…hope you get my point.

    Thanks for reading!
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