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Andy Stephenson

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Everything posted by Andy Stephenson

  1. Andy Stephenson

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  2. Andy Stephenson

    Andy Stephenson posted a gallery image in Member Albums

  3. Andy Stephenson
    Tony, I sent you a PM on this forum asking about moulds for vac forming, only I don't think you have read it yet. I don't want to subvert this thread so I wondered if you could see my PM and comment. Many thanks Andy.
  4. Andy Stephenson
    Scruff, Try this it's available direct from the Deluxe Materials and other retailers... https://deluxematerials.co.uk/collections/building-finishing-products/products/foam-armour It may be better to coat the foam first before painting and then again after as even the most compatible paints don't always stick to the waxier foams. Dreamflight use EPO which is difficult to paint. A. Edited By Andy Stephenson on 11/04/2020 10:10:03 Edited By Andy Stephenson on 11/04/2020 10:10:31
  5. Andy Stephenson
    Andy48 The document I referred to above appears as a email circulated by Duncan McClure South Midalnds Area Delegate to the BMFA and recommends that a local club adopts an embargo of open source radios as he maintains it IS possible to change the power settings using this system. I have now seen this email but it is an internal club communication so I won't put it online without permission. You may want to contact Duncan directly on this subject. Andy.
  6. Andy Stephenson
    Posted by Andy48 on 06/04/2020 21:29:37: Posted by Andy Stephenson on 06/04/2020 17:41:04: I heard of a case where it is possible to adjust the TX output power on open source radios by reprogramming the RF chip. If the power is increased by tinkering with the code and this consequently causes interference to other users who then is liable. More to the point how would you ever prove it. A. Since the programming for the RF chip is not open source but manufacturer's software, then I cannot see any worse problem than with any other make of transmitter. Andy48 I will try to find the original document that explains how this was done. Not necessarily through the normal open source route but still possible with a little research. A.
  7. Andy Stephenson
    I recently made a 15" x 13" vacform box from ply and MDF and a frame from ali angle. The frame was sized to slide under the grill in my cooker, for this reason I couldn't use bulldog clips which would have made the loading of the material much easier. With a home vacuum cleaner and a cooker the rest was just a bit of workshop time. My first and only piece came out perfectly first time.
  8. Andy Stephenson

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  9. Andy Stephenson

    Andy Stephenson posted a gallery image in Member Albums

  10. Andy Stephenson
    I heard of a case where it is possible to adjust the TX output power on open source radios by reprogramming the RF chip. If the power is increased by tinkering with the code and this consequently causes interference to other users who then is liable. More to the point how would you ever prove it. A.
  11. Andy Stephenson
    My explanation comes from several decades of model building and flying experience, While aerodynamics is a complicated subject all I can say is I have actually seen these effects occur. If you are not bothered about trimming for best performance then have at it. A.
  12. Andy Stephenson
    Posted by PatMc on 04/04/2020 22:56:38: Posted by Andy Stephenson on 04/04/2020 16:47:02: CL models usually have zero dihedral to allow the control wires a straight run to the elevator bell-crank. If converting to one to R/C you might find significant adverse roll on application of rudder without adding a commensurate amount of dihedral to the wing. A. Care to explain why ? Pat, I can explain why this is the case. The application of rudder not only tends to create yaw it also acts like a kind of aileron causing a rolling effect. With right rudder applied it tends to roll the plane to the left. We all know that on a rudder steered plane you need a fair amount of dihedral to induce a turn because the rudder yaws the plane then the forward going wing presents more air resistance which rolls it into the turn. There is a point at which if just the right amount of dihedral is applied the adverse roll effect of the rudder is cancelled out by turning effect. This why pattern ship designers always strive to get this just right to create the most neutral flying characteristics. Andy.
  13. Andy Stephenson
    CL models usually have zero dihedral to allow the control wires a straight run to the elevator bell-crank. If converting to one to R/C you might find significant adverse roll on application of rudder without adding a commensurate amount of dihedral to the wing. A.
  14. Andy Stephenson
    The glue I bought from the local pound shop for sticking down edges of wall paper turned out to be PVA which I ended up using to cover foam wings cores with lining paper. I wouldn't use standard PVA as a heat sensitive adhesive as I don't think it's very effective. Instead I have used Deluxe Materials CoverGrip which is made for the job. A.
  15. Andy Stephenson
    Martin, Do you have any clues as to which other classic aerobatic kits are coming from the Cloud. Andy.
  16. Andy Stephenson
    Here's the Bullet I put together last season from the PB kit from Cloud Models. OS 46FX powered... Edited By Andy Stephenson on 02/04/2020 23:21:16
  17. Andy Stephenson

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  18. Andy Stephenson
    Posted by Sheepish on 27/03/2020 21:12:42: Hi Andy I’m not surprised it was a beast, the original had a Super Tigre x15 and a very natty paisley nylon finish judging by the RM cover it featured on. I should think the OS 32 had twice the power. Definitely bicycle clips time. Shaun I originally asked in my local model shop for an OS25FSR for it but the owner said you don't want one of those have an OS32 instead they are the latest thing. I took one look at the original on the front cover of RM and thought that style of fabric was a bit 1970s so I covered it in Glosstex instead. Over-weight over-powered, what could possible go wrong.
  19. Andy Stephenson

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  20. Andy Stephenson
    I remember at the Woodspring Wings show watching Paul Heckles and Mike one of our local club members fly two Regal Eagles in a slow very close formation, a unique display never to be repeated. A.
  21. Andy Stephenson
    If there are to be delivery drones I'm sure too many of them will go missing in action to make it worth it, let's hope so. It might turn out like the community bike hire system tried in many cities where there were too many ne'er-do-wells. A.
  22. Andy Stephenson
    Of the pliers type there are 6 different versions on Sussex MC... https://www.sussex-model-centre.co.uk/catalogsearch/result/?q=z+bend A. Edited By Andy Stephenson on 29/03/2020 22:22:21
  23. Andy Stephenson
    Posted by Robin Colbourne on 29/03/2020 02:24:11: Andy, Thank you for posting your power supply circuit diagram. Three questions: 1. At risk of appearing totally thick! Do the hand controllers go in line on the motor outputs shown? 2. Can you use standard Scalextric hand controllers with this speed controller? 3. How do you vary the input voltage to suit differences in line length? Robin, I think you misunderstand, this IS the controller, you need a DC power supply to feed it. The power is applied to the rails, positive and zero(-ve) and the motor is connected to where it says motor o/p. The speed is controlled by the potentiometer labelled VR1 on the schematic. No need to use any other controller as explained above The input voltage needs to be enough to overcome the resistance of the lines so using a variable power supply is the best solution. We have been using the same controllers since I made them 25 years ago and they are still going strong. They were built into small plastic project boxes with slider pots some with spring returns. We have had them on really long lines at the Model Engineering Exhibition and short lines at club meetings in a village hall. The power supply we use is one in yellow case with various output voltages, I'm not sure who made it. It looks like Harry Butler isn't selling RTP kit any longer so it may be necessary to get a laboratory style bench power supply for this application.
  24. Andy Stephenson
    A while ago I designed a simple electronic RTP controller that used a resettable over current trip...
  25. Andy Stephenson

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