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Dave Hopkin

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Everything posted by Dave Hopkin

  1. Dave Hopkin
    **LINK** A Bargin!!!! Buy it now more than 10 available!!!
  2. Dave Hopkin
    Plodding - Power train safety interlock added and tail plane/fin fixed in place (elevator and rudder loose) - some fettling to do to get the fin to fit snugly against the tail post - Fuselage in the process of being covered in PVA's Brown paper (to reduce hanger rash while the wings are made) Details of the safety interlock Hatch underneath gives access to the battery box bolts and the arming lead - dummy air scoop makes a nice handle for the hatch!
  3. Dave Hopkin

    Dave Hopkin posted a gallery image in Member Albums

  4. Dave Hopkin

    Dave Hopkin posted a gallery image in Member Albums

  5. Dave Hopkin

    Dave Hopkin posted a gallery image in Member Albums

  6. Dave Hopkin

    Dave Hopkin posted a gallery image in Member Albums

  7. Dave Hopkin

    Dave Hopkin posted a gallery image in Member Albums

  8. Dave Hopkin
    A dyslexic friend of mine decided that going to poetry classes might help with his condition.... He's been going for a few weeks now, haven't heard any of his poetry buts he given me a nice vase and a few cups
  9. Dave Hopkin
    You could also try a 9x4 prop on it, then the motor will be doing less work
  10. Dave Hopkin
    Posted by kc on 01/05/2017 10:54:41: Looks a neat idea Dave but won't it be a bit hazardous to grip the cowl & pull the whole front out whilst that 16 inch prop is still live? Also the ESC to RX lead will move around too. Your comments have had me mulling all day in the office....... The solution: There is a hatch underneath between the undercarriage legs, where the tray fixing bolts go, there is plenty of space to fit a circuit break point - i.e. the +ve from the ESC to a female connector mounted (mouth down) at the rear of the tray, next to it will be a second female running to the battery connector - there will be holes aligned so when the tray is fully inserted the two female bullet connectors will be visible when the hatch is removed - a short length of wire with a male bullet at each end will arm the circuit - without it the plane will be dead - so the link can be pulled without going near the prop - best make a spare link up too!!!!
  11. Dave Hopkin
    Posted by kc on 01/05/2017 10:54:41: Looks a neat idea Dave but won't it be a bit hazardous to grip the cowl & pull the whole front out whilst that 16 inch prop is still live? Also the ESC to RX lead will move around too. The ESC will be inside the sliding tray so in a fixed position in relation to the motor with a long lead to the RX to allow for the tray to be pulled out The cowl is fixed to the airframe, the front of the tray slides out through the front of the cowl - yes there is an element of risk - that cannot be denied - but as I the battery is connected with the tray extended and hands clear of the prop then the tray slides in (that being the risk point) the ESC would have to go faulty AFTER connecting the battery in the few seconds while the tray was being slid in - and during that time the throttle lever will be at zero and the throttle cut switch set to zero.- I dont think there is any more risk than starting an IC engine to be honest
  12. Dave Hopkin
    Posted by Jon Laughton on 01/05/2017 23:02:44: Balsa & ply Dave? Did you run out of Depron....😉? Going IC next? a) Yep b) Never! Why would I go backwards to 19th century technology?
  13. Dave Hopkin
    Posted by john stones 1 on 30/04/2017 16:20:42: And before a Yorkshireman invented the wheel, we all walked. John Trumpesque fake news that - everyone knows he was from Lancashire!
  14. Dave Hopkin
    I think what we are seeing is a watershed in that in earlier years the only way to fly was to build a kit or from a plan - therefore the vast majority of those that had no interest in building or believed they didn't have the required skills never entered the hobby at all - And of those that did take the plunge and started building, how many actually ever finished it? - I would suggest quite a percentage fell by the wayside, a sort of natural filter ensuring that only those with a reasonable level of dedication would ever arrive at a club field with a plane. Now with RTF/ARTF's pretty well anyone can get into the hobby very quickly and with little or no skills required - so the hobby is now accessible to many many more BUT that accessibility removes the natural filter and sp we see so many "blow in - blow outs" who have a dabble then vanish again - but a small percentage will stick around Will they start building (rather than assembling) - I would say a percentage will, especially if they see non ARFT's flying at the clubs
  15. Dave Hopkin
    Posted by Hamish on 29/04/2017 21:46:36: I appreciate what has been posted but would suggest that rather than berate individual we should inform. In this case the guy was prepared to learn. On the subject of keeping up with regulations, when was the last time you read the Highway Code? At least I am aware of the highway code - in this case he wasnt even aware there were regulations! Edited By Dave Hopkin on 29/04/2017 21:55:10
  16. Dave Hopkin
    Its something I have been thinking about for a while but finally put started converting balsa to dust...... Wanted to try a battery tray that slides in and out to avoid hatches that always seem too visible and the big radial cowl on this seemed to be perfect for it As the battery will be when flying (if indeed it does!) And as it will be to change Lipos The plan is to secure the whole motor/battery tray with two bolts from underneath into the captive nuts above the tray.... Planning to use a Turnigy G60 300kv on with a 5S 5000 Lipo and something like a 16" prop..... thats the guess at the moment
  17. Dave Hopkin

    Dave Hopkin posted a gallery image in Member Albums

  18. Dave Hopkin

    Dave Hopkin posted a gallery image in Member Albums

  19. Dave Hopkin

    Dave Hopkin posted a gallery image in Member Albums

  20. Dave Hopkin

    Dave Hopkin posted a gallery image in Member Albums

  21. Dave Hopkin

    Dave Hopkin posted a gallery image in Member Albums

  22. Dave Hopkin

    Dave Hopkin posted a gallery image in Member Albums

  23. Dave Hopkin
    Earlier today I was up at the Snipe Retail Park in Ashton, walking towards Halfords front door - when what caught my attention..... a JDI Phantom flying quite erratically at about 60ft above the very busy car park I looked around and eventually spotted the "pilot" standing up in the corner half hidden - So I marched up to him and tore into him asking him if he knew he was flying illegally? and telling him to land the quad Surprisingly he said "let me land it then" - he performed a rather flustered landing, then I had a right go at him... do you know the law? Do you have insurance etc etc What surprised me, was after a few seconds he said, "Why dont you stop berating me and educate me, where do I find out about the rules" - I told him to look at the BMFA website and the Handbook Apart from walking away feeling slightly smug it struck me that all the publicity surrounding drones and the law had abjectly failed to reach this particular "pilot" - so how in gods name do "we" (royal) get through to then en mass?
  24. Dave Hopkin
    Thread the sleeve and the grommet onto a screwdriver or bit of piano wire and push into the hole they line up and slip into place easily then
  25. Dave Hopkin
    Posted by Dave Bran on 21/04/2017 09:04:22: Posted by Dave Hopkin on 19/04/2017 21:56:08: The C rate has no effect on flight times Say you have two 1300mAh packs, one a genuine 20C, the other a genuine 60C. If the power train on the model can suck even some of the extra juice available, surely the pack will be depleted faster and duration reduce? Nobody so far has been as blunt as to say, but some manufacturers vie for maximum "C" discharge ratings per price bracket as bigger numbers sell, and whether that number is actually correct to claim is not easy to check. The C rating is a measure of the batteries ability to deliver current on demand and is governed by the internal resistance of the battery (which will vary between packs and degrade over time) The motor/prop determines the demand placed on the battery to supply current (Amp) Capacity / demand = Duration IF the C rating is high enough to deliver that current Once we raise the C rating high enough to meet the demand flight times will not be changed by increasing it further BUT dont forget C ratings are a measure of the batteries ability to discharge without causing internal chemical damage - all batteries will deliver much higher currents but internal damage may well result
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