motortommy

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Everything posted by motortommy



  1. motortommy added a post in a topic case of disaster or to live one`s dream   

    long time no update...
    work, family, house refurbishing and flight lessons are only few excuses why my bird is not flying yet again. Honestly had disillusioning moments during the rebuild. But fortunately finally all the small achieved objectives puzzles together so hopefully there will be a flying plane again someday...
    partial success
    rebuilt 582 with all new cylinders, pistons, crankshaft,...
     
    new wingtips

    reworked fuselage, blasted, painted and smoothened out for Oratex

    next put back header tank/fuel lines, wires for trim, ACL and antenna and lots of reaming prior installing all new AN hardware...
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  2. motortommy added a post in a topic new rudder springs   

    Thanks for taking care!
    Good point to start from. No need for too strong springs as only purpose is preventing slack, right?
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  3. motortommy added a topic in Kitfox IV   

    new rudder springs
    I need new rudder springs, but unfortunately have no usable samples.
    Has anybody rough spec. (dia./length/spring rate). I`m located in Europe, so ordering via mothership isn`t an option... Thanks!

    • 6 replies
    • 334 views


  4. motortommy added a post in a topic Bush gear failures   

    Dusty, any updates regarding the PU pucks setup? 
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  5. motortommy added a post in a topic Bush gear failures   

    I like to get back to the PU spring strut and its setup...
    Using 5 pucks (4x red 90shore + 1x yellow 80shore) should give attached results according to manufacturer spec.
    As a base I used coil spring data. I`m worried that this PU setup might be too stiff, means only minor movement and or no comfort at all! The data would result in 0.548" strut travel during normal landing. This means approx. 1" vertical movement of the gear (w/o tire deflection)...
    Would be interesting to know, how much movement there is with a classic bungee gear.
    So far, i have only rough data at least also inaccurate due to metric/imperial transformation. I will put a test strut into a hydraulic press to measure travel according to applied load.
    Any thoughts or hints?  

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  6. motortommy added a post in a topic Kitfox IV 582 vs. 912(80hp) only   

    Thanks Jim for your helpful insights! Not always easy to make right decisions at an early stage of a rebuild (even for a less experienced pilot with no idea of Kitfox flying). As long as I´m limited to 80hp (by ultralight approval) I decided that an engine swap is too much of a task at he moment. First I want to finish my rebuild and get the Kitfox back in the air. Second I want to build up/improve my TW skills (pure newbie). Later I will see how to proceed...       
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  7. motortommy added a topic in Kitfox IV   

    Kitfox IV 582 vs. 912(80hp) only
    I know that this topic has been discussed several times, but anyway I would like to ask for some real life experiences. There should be folks who meanwhile have experience with both 2 and 4 stroke powerplants…
    Due to microlight regulation I`m interested mainly in comparison of 65(582) vs. 80 hp (912). So no focus on 912uls, zipper, edge,… options
    Is the swap worth the effort? Why/why not?
    Aside from short following pro and con list, how did your Kitfox IV changed? What real life numbers did you gain?

    con
     
    cost (engine, mount, prop, accessories,…)additional weightno ideal installation with early mount (oiltank, carb position, …)approval procedure neededno quick and easy swap (cowling, cooling System, avionics,… are affected)…
    pro
     
    improved reliabilitysimplified operation proceduresbetter resale value of the planeincreased performance (cruise/climb)…
    Thanks for any insights!
    • 2 replies
    • 613 views


  8. motortommy added a post in a topic Kitfox 4 build # 2   

    Nice Jim, following along...
    would you mind telling the measurements roughly (width)?

    Thanks Marc
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  9. motortommy added a post in a topic Model 4 manual question?   

    like this? (sorry written numbers are metric conv.)
     
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  10. motortommy added a post in a topic Mr Alfredo Palmero   

    maybe you want to get in contact with FredStork aka Mr. Avid/France 
    http://avidsimhttp://avidsimonini.blogspot.co.uk/
     
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  11. motortommy added a post in a topic case of disaster or to live one`s dream   

    overhauled 2 Rotax C gearboxes.
    Cleaning, glass blasting, Propshaft checked. All bearings and sealings new. Hope they`re good to go again ...

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

    Thanks, great! I will study. Looks like a more modern abstract of
    http://www.faa.gov/documentLibrary/media/Advisory_Circular/AC_43.13-1B_w-chg1.pdf
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  13. motortommy added a post in a topic IV fuselage repair - measurements   

    thanks for any help
    Unfortunately I have to replace some sections due to wrong dia./poor welding...   
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  14. motortommy added a post in a topic IV fuselage repair - measurements   

    hmm, thanks!
    Looks like a combination of bowed part in the middle and straight ends, tail and baggage area...
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  15. motortommy added a post in a topic IV fuselage repair - measurements   

    anybody out there with a genuine (not crashed) fuselage?
    I want to replace some parts of the lower longerons due to improper repair. Questions:
    - are the longerons one piece till the tail?
    - is the longeron shape gently bowed (like #1) below or is the longeron divided in sections with straight tubes angled (like#2)
    Hope you got what worries me... 
      


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  16. 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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  17. 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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  18. 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!

    • 11 replies
    • 2,066 views


  19. motortommy added a post in a topic Propeller, IVO, IFA (sold!)   

    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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  20. motortommy added a post in a topic Propeller, IVO, IFA (sold!)   

    Vladimir,
    what ist the best fit for Rotax 582 using 3:1 gear? your opinion?
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  21. 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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  22. 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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  23. 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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  24. 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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  25. 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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