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  1. Jim Allen

    Sullivan 12 Volt, SUL601 starter

    Can this starter be used with a 5.0ah 19.2 volt Lithium Battery without any damage? Jim Allen
  2. Jim Allen

    What is this tool used for?

    This precision setting gage eliminates the use of ring gages when setting a Sunnen Bore Gage. Are there any machinist or tool makers out there that have used this toll? Jim Allen
  3. Jim Allen

    typical drilling operations of hardened materials

    "In drilling operations, the by-products of the rotational energy applied is chips & heat; either high heat & less chips or less heat & more chips. Multi-faceted geometry generates the least amount of heat of all the drill point patterns. In comparing two drills of the same diameter, the...
  4. Jim Allen

    Hitec D845WP (IP67 rated) servos

    I have two, brand new, never used Hitec D845WP (IP67 rated) servos with molded grommets, eyelets, 3-48 stainless mounting screws with washers & many extra servo arms for sale. I want to sell both servos for $75.00 dollars each, not to include shipping. The servos also come with the Dynamite...
  5. Jim Allen

    Solidly Mounted Servos

    Does the solid mounting of servos shorten their operating life? These are Hitec D956WP servos in an aluminum mount. No rubber grommets are used. Jim Allen
  6. Jim Allen

    compound grinding fixture

    The custom made fixture shown can grind compound angles on either square or round tool bits. I believe it to be "one of a kind". Jim Allen
  7. Jim Allen

    Special Tuned Pipe Mount

    The custom machined pipe mount system with its 5/8" OD X 1/2" thick isolation mounts has been completed. JA
  8. Jim Allen

    3D Printing

    I saw these articles and thought they were interesting. https://all3dp.com/german-prototyper-3d-prints-motor-block-aluminum/ https://all3dp.com/3d-printed-rc-planes-czech-pilot-shares-beautiful-designs/ Jim Allen
  9. Jim Allen

    A Sealed, Adjustable Weight System, Designed For MONO Hulls

    The simple adjustable weight system shown was added to an AC Slayer 49" Mono which uses a 35 cc Zenoah & a Performance Unlimited tuned pipe. The hull could not be balanced to the designed balance point, 17.5" from the transom, after adding the 3 " diameter, 11 degree baffle tuned pipe & muffler...
  10. Jim Allen

    Three Piece Crankshaft Die Set

    This die set will be used to disassemble & assemble three piece crankshafts. It will give an accuracy of total runout from end to end of + or - .0005"; providing the crankpin holes are square to one another. Final trueing of the crankshaft will be done in a four jaw chuck to a total runout of +...
  11. Jim Allen

    Carbon Fiber Catamaran with an adjustable CG & adjustable turn fin

    Both of these systems were shared with me by a very capable Australian model boater. The 1/16" thick turn fins are machined from spring steel stock. They are machined to a full wedge, leading edge to rear edge with carbide tooling & a simple fixture. The turn fins can be adjusted in position &...
  12. Jim Allen

    A Special Rudder Linkage

    This rudder linkage was designed to allow right rudder actuations to be done by pulling the rudder rod rather than pushing the rod. All the linkage moving metal parts are made of AISI O-1 full hard tool steel. Metal to metal bearing points are insulated with machined teflon pieces. The...
  13. Jim Allen

    Re-machined piston bosses

    A simple two part fixture allows the re-machining of existing stock piston bosses so that the custom connecting rods used can be guided in the upper end where the rotational speeds are much lower than the bottom end. The total clearance in the upper end between the piston bosses is now...
  14. Jim Allen

    Engineering never stands still

    https://www.youtube.com/watch?v=Adl1Sn86ojs The youtube address works at youtube but cannot be reached from here. I do not know why. JA
  15. Jim Allen

    Cool Engine

  16. Jim Allen

    Interesting what can be done with steel

    Jim Allen
  17. Jim Allen

    Randleman Lake

    Is anybody running in Randleman Lake located between Randleman & Level Cross, NC.? Jim Allen
  18. Jim Allen

    dimension between the ground strap & the piston at TDC

    A picture of the 1 to 10 drawing in the photo shows that the bottom of the ground strap is .016" away from the piston at TDC in my 27 cc engine. What are some typical numbers in hemi type heads? The second photo shows that the glow plug is .048" away from the piston at TDC in my 16 cc engines. JA
  19. Jim Allen

    accurately determining the amount of radial play in a ball bearing

    I will post photos of the tool, with explanations, that we use to accurately determine the radial play of ball bearings used in our racing engines. We purchase WIB Swiss made bearings that are made to our specs. Since the bearings are pressed onto the crankshaft & shrunk into the crankcase a...
  20. Jim Allen

    Construction details for a reliable high performance connecting rod

    I will begin a series of post on how to construct a steel "I" beam type, roller connecting rod. The rods can be used in high performance gas & nitro engines. Jim Allen
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