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Dave Hopkin

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Everything posted by Dave Hopkin

  1. Maybe this is the way forwards.... Japan already has 80 Hydrogen fueling points and 42 in California **LINK**
  2. All well and good Percy for short/medium distance journeys - but if I want to go on holiday with the car i need the legs and fast refuel times liquid fuel gives me (and that doesnt have to be oil based liquid) - exchangeable battery packs might be the answer (if they standardise them) but even fast recharge points are going to mean a lot of dead time
  3. I still think that the "tipping point" for electric cars wont happen until the recharging time can complete with the refueling time of conventional cars - perhaps exchangeable battery packs are an answer or as I suspect are electric cars going to be betamax/squarial technology and ultimately rendered obsolete by something like liquid hydrogen powered cars?
  4. It also happens when you haven;t allowed the ESC to "learn" the TX - to do this: power off the model Remove the propellor TX on and throttle open to full Power on the model the ESC should bleep once per cell as it senses the Lipo then give a longer bleep Reduce the Throttle to its lowest point Power off the model Power up the model and (fingers crossed) it should work If you have Futabla you may have to reverse the throttle
  5. Had a college over from the US and he wanted to see the sights then back to ours for dinner- as we were opening the front door he was saying "Gee everything in your country is so small, the houses, the cars...." then he saw the wife - that shut him up
  6. She phoned me from work and said "three of the girls in the office have had big bunches of flowers delivered, they are gorgeous" I said "That's probably why they got flowers"
  7. you just cant please women... Got the Mrs 250 flowers for Valentines Day So what if the spelled out "Granddad"
  8. And don't lick yellow ice.... or "Frozen Chocolate"
  9. With the assumption that batteries will continue to improve in energy/weight ratios I think that the 40 to 60 size will become increasingly rarer to see - they wont die as such as there are so many in regular use but I would expect to see sales of the lower end of IC to dwindle considerably, but I cant see electric making much ingress into the larger end of the IC Market place in the short or medium term unless there is some dramatic change in the available technology, but that technology change will arrive at some stage and allow some ingress of electric into the larger end of the market
  10. Posted by John Stainforth on 31/01/2018 18:38:02: Dave, Glow fuel is not a fossil fuel - it's comprised of methanol and nitromethane and some oil (which could be non-fossil).   Nitromethane is produced by a chemical reaction using propane and nitric acid - propane is a natural gas, ergo a fossil fuel   Edited By Dave Hopkin on 31/01/2018 18:46:02
  11. Posted by Jon Laughton on 31/01/2018 18:18:51: Hey Hoppy! Long time no see....and you know you really want that two stroke model! Hey Jon I might well be tempted but SWHMBO is most definitely not a fan and I know what battles are just not worth fighting!!!
  12. Is IC doomed? Probably but not for a long time yet! Reasons a) Its a fossil fuel based so running costs will only increase over time faster than electricity will b) Its essentially a static technology very little R&D money is invested in IC these days compared with the billions being invested in battery technology - in time that will filter down to us flyers and power/weight ratios of electric sets ups will get better and better and at some stage offer the same endurance as IC c) The vast majority of new blood to the hobby comes in now on electric power, yes a proportion will convert/dabble in IC but I suspect the majority wont
  13. If you tear the brown paper rather then cut it the overlaps are far less visible
  14. Posted by Geoff Sleath on 14/01/2018 14:25:31: It looks very good with the film covering. What motors are you using and what energy source - 4S LiPo or more? What temperature do you set your iron to avoid damaging the foam? I usually set mine to 135 degC for HK film but up to 150 deg for things like wing tips when maximum shrink is needed. Not that I'm great at covering Geoff I set mien at 100 for glueing down and 120 for shrinkage....... 150 sounds very hot to me
  15. I am a little bit concerned the article posted by Cuban8 states "A team from Essex-based Kennet were given permission to salvage the aircraft and secure it in a shipping container which was then taken to a site at El Alamein" So if its in a contained in El Alamein is the hideous looking monstrosity the SAME aitframe or a different one? After all it wouldn't be the first time the Mail were economical with the truth
  16. Don't see how it could be "sucked in by the down going piston" - that would exert suction on the carb output and air would be far easier to suck in that fuel................. There might well be an element of suction when running from the needle valve as air is dragged past the spray bar Seems logical that air displaced by the exhaust stroke would provide the bulk of the pressure to drive the fuel there might also be an element of siphoning too............
  17. I ordered a laser cut parts kit and plans in the evening of the 11th Dec, it arrived this morning - not a bad turn around time
  18. Barrie's Funeral will be on Tuesday 19th at 1:30pm in the Manchester Crematorium
  19. I am sad to have to pass the news on that Barrie Hull has passed away, he was a long term member of Hough End MAC and was also known to clubs in the South East Midlands where he spend much time.
  20. Paid a visit to the Army School of Camoflague Museum a couple of weeks ago, worst museum I have ever visited - didnt see a thing I'll get my coat................
  21. If you need an alternative browser Mozilla Firefox is free and excellent
  22. If you have ANY doubt whatsoever about an email being genuine, DO NOT follow the supplied link Go the the site and log in normally and look, in this case at your cart HK might send links but it is against best practices and in the financial industry it is contrary to FCA code of conduct to send links - so if you get an email from a Bank with a link DO NOT OPEN IT no matter how genuine looking it seems
  23. Posted by Tony Kenny on 19/10/2017 17:49:01: here's another question however, on the Mirage, the fuz is fibreglass, would I just paint that or can coverings stick to fibreglass? Iron on film will stick to fibreglass as long as its been de-greased, but as its non porous you will have issues with ait bubbles - better to paint it
  24. To try and clarify what you are seeing, perhaps some basics may help - a "Watt Meter" doesnt actually measure Watts, it calculates Wattage based on the measured Amperage and the applied Voltage using a derivative of Ohms Law - Watt = Amps * Volts With electric motors their published power figures are usually a multiplication of the max rated voltage and max current flow rather than any measured values - to get that power output we have to set up the right running conditions and we only have Voltage and Load to play with for a given motor - the ESC doesn't really enter into the equation as long as its capacity is high enough (yes settings can alter performance but in simple terms...) A Lipo should on full charge be giving 4.2V per cell, so your 3S fully charged should be giving 12.6V clearly yours is not giving anywhere near that, so give it a full balance charge and check that all three cells are at (or near) 4.2V when charged - then repeat the measurment If the Lipo is ok but you are still not generating enough power you have two options a) Increase the Voltage and go to a 4S pack b) Increase the load (which will increase current draw) with a bigger prop
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