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ptwizz

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ptwizz last won the day on December 17

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About ptwizz

  • Rank
    Paramotor Club 500.
  • Birthday 03/03/1963

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  1. ptwizz

    Radial engine build

    One last photo to round off the year. A 'dry' assembly with all the 'front end' parts in place. This marks the completion of the induction side of the engine. Next will be the oil supply, scavenge, oil tank, primary drive and ignition systems.
  2. ptwizz

    Radial Engine Build

    Off topic - Radial engine build gallery
  3. ptwizz

    Radial engine build

    New photo - the first of the inlet tracts loosely assembled. Now I need to practice Tig welding thin stainless tube a lot.
  4. ptwizz

    Paramotor transport in a motorcycle

    Yes, indeed I did! I never owned a motorcycle trailer. I helped out the guys at Freewheel https://www.freewheeluk.net/ many years ago when they needed to design a subframe for an overseas customer who had a Kawasaki Zephyr. I had a Zephyr at the time, so the subframe was designed around my bike and I had the opportunity to try it out.
  5. ptwizz

    Paramotor transport in a motorcycle

    I second the proposal for a trailer. If you bolt a sub-frame to the bike, supporting a standard tow ball behind the rear wheel and below spindle height, you can tow a conventional two wheel trailer. I have ridden this set up and it is surprising how little difference it makes to the bike.
  6. ptwizz

    Other interests?

    For me, Paramotoring has now given way to microlighting. Aside from flying, almost anything with moving parts interests me. I also dabble in a little amateur electronics. Bikes seem to be a recurring theme here - I currently ride a Triumph 1200 Tiger and I've built a few, including a Panther (British 600cc single) with a whole array of hidden features.
  7. ptwizz

    Radial engine build

    Another couple of photos added, showing the mechanism for engaging the high supercharger speed. A cable will pull on the long end of the curved lever, pulling the ends of the brake band together. When assembled, the brake band sits around the ring gear carrier shown in the other photo. I had a chap come to visit last week, who is also building a radial engine. I am not the only person in the world mad enough to embark on such a project!
  8. ptwizz

    Radial engine build

    Hi Hann, I don't consider myself patient. The engine is a hobby, so I work on it when the mood takes me and step back from it as soon as it starts to feel like work. For that reason, there is no projected date for firing up. I see Bren quite regularly on Tuesday evenings at the Old Buckenham bike night. Very nice chap!
  9. ptwizz

    Radial engine build

    More photos added to the album and more progress. The supercharger housing has been bored to the profile to fit the impeller, using a fiendishly bodged copy technique which worked rather better than expected. I have not yet bored the holes for the inlet tracts to the cylinders. The inlet tracts will be fabricated from stainless steel and I have a better chance of boring the holes to match the geometry of the fabricated parts than the other way around. In the meantime, the supercharger parts are assembled and the SU carb hung on the front, looking like it means business. In other news, I am now the holder of a NPPL(M) and my aircraft passed inspection. I may be gone for some time...
  10. ptwizz

    One of the best jokes

    As our 20th wedding anniversary was coming up, my wife asked me to get something 'to spice things up in the bedroom'. I bought her a small, potted rubber tree. "There you are", I said, "It's a latex fetish starter kit".
  11. ptwizz

    Radial engine build

    Thanks Alan. I've just completed the last couple of hours solo at the weekend, so I'll be sending off for my license this week and getting a permit on my Thruster, G-BZNP.
  12. ptwizz

    Radial engine build

    Another photo added - Supercharger housing. This one is guaranteed to raise accusations of having a CNC mill hidden away in the back of my garage. All the machining was carried out on my manual mill, using an improvised profile copying device. Kiwi dropped in during the process and has seen how it's done. I'll add some photos of the process in the coming days.
  13. ptwizz

    2018-06-24 09.15.37.jpg

    Supercharger housing
  14. ptwizz

    Radial engine build

    A few more photos added to the album. The supercharger (it'd be rude not to) impeller is fabricated around a cone, turned using my home made radius turning attachment. Nine of each of two sizes of impeller vane are cut from 2mm steel, with tabs which fit into the slots on the cone. Each vane is TIG welded at the back of the cone where the tab goes through, then the whole assembly is brazed, using the TIG torch at lower current to accurately heat and draw the Sifbronze material along the join (mostly) without forming blobs and puddles. The assembly is finally trued in the lathe. PS I have now passed GST for the microlight, so look out for G-BZNP at an airfield near you (provided its not too far from me).
  15. ptwizz

    2018-05-25 11.57.50.jpg

    Supercharger impeller cone turned and slotted to receive vanes
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