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Yorkman

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  1. Yorkman
    I posted on here a while back about dad's last creation which I acquired half-finished when he died, a Bristol Bombay of about 6 ft span with twin electric power in which he had installed speed 700s and in line gearboxes, which I junked and replaced with low kV brushless inrunners so I could use scale diameter props. Well the thing is far from finished, but in a flyable state, so today I decided to take it and the York to the strip and see if I could make a second (the York is the first and was until today the only) of dad's designs take to the air. The strip hadn't been mown for a while-the dandelions were pretty high!-but I reckoned useable, so tried the York first-a long takeoff run due to dandelion-mowing activities on the way, but otherwise fine, and good to see the fat old beast back in the air, greased her back on after 7 minutes...it was now or never. Well, what an anti-climax! Apart from nosing over because of the long grass on the first attempt, full up-elevator checked that and bags of power from the brushless motors lifted the Bombay from the strip without any dramas and she flew away like a trainer, pretty much in trim and really the only issue being a lack of down thrust which I'll dial out on the Tx mixes. After 5 minutes I plonked it down (it's a real floater) and have to admit punching the air in delight and calling into the blue sky to ask my father if he'd liked that....
  2. Yorkman
    As a flying boat 'virgin' up until a couple of months ago, I look forward to hearing how you get on. Good luck!
  3. Yorkman
    hey Matt where do we find the info on yours? Have you done a blog? Got plans? What's the spec? Martin
  4. Yorkman
    Hi BEB I've got a Coota-http://www.youtube.com/watch?v=mWRF2cDi64s-yes, the wings are glued on-but I unglued mine, and with a length of carbon rod and ally tube made plug-on wings and transported it via TAM to Brazil..so I'm sure you can make it to Scotland with it! Yes, the tailfeathers are a bit wobbly, but I haven't had any issues with wing strength, either before or after making them removeable. It does drop a wing on stall, but you have to really abuse it, and it handles...differently, because of the pylon mounted engine, but I'm guaranteed some flying if I take it out, and did a few lakes in Brazil perfectly successfully. One thing I would suggest if you go for one, is to seal the canopy with tape before flying from water-or empty half a pint or so out if your landing is less than perfect! http://www.youtube.com/watch?v=mWRF2cDi64s   Edited By Yorkman on 26/04/2010 19:39:33
  5. Yorkman

    72

    Yorkman replied to Aidan's topic in Power System Selection

    Hi Aidan my York is the same size-72"- as your Lanc and flies in a very 'scale' manner on 4x speed 400s. However, it is much heavier, with gearboxes to give more scale diameter props, scale retracting u/c and flaps. If I could, I would definitely go brushless-I am using a lipo as it is much lighter than the two nicad packs I used to use, but the voltage/current is a bit much for the little motors, so full throttle (or WEP!) is used only for takeoff (she's not a hand launcher ) and I've already had to replace one motor. If you can afford the 50 quid, I would go for Timbo's recommendation-it will save having to get into the nacelles/wings at a later date, and it's always better to have too much power than not enough! Good luck.
  6. Yorkman
    well, went for a couple of sorties this morning-9 minutes on the 2250, 7.82volts remaining, and 10 minutes on the 1850-7.69 left. According to Timbo's chart, that's 80% and 60%, so-if I ever get the damn thing to fly properly, which is another story-20 minute flight times look on the cards. I will keep boring you all as I discover more!
  7. Yorkman
    Peter first pack just came off the balance charger with 8.27v showing-so perhaps I'm not starting with as full a pack as I thought... I don't generally use the 'fast' charger that gives figures for time'amps etc, so not able to check that. What I used to do with nicads, was run the model at full chat and time until the power went, and use that as my timer setting for the first few flights, after landing seeing how much was 'left in the tank' by running once again to BEC switching, and adjusting flight times accordingly. I don't do that with lipos as I'm frit of discharging too far-read too many horror stories! Hence I started with 8 minutes, and checked volyage levels. I wasn't for one moment serious about being able to fly for 40 minutes, but will extend my flight times to 10 minutes next time, and see what we have then. When it stops raining.... PS-was thinking of doing her in PR colours-some marks of which I believe did carry extra bomb bay fuel tanks....
  8. Yorkman
    Nick Timbo's chart is in the first topic in this forum-Looking after your LiPo cells where I believe he has done exactly as you suggest, and plotted battery voltage as a representation of % charge remaining-your arithmetical figure of 75% being slightly worse that his, but probably safer to use (I'm certainly not trying to get every second out of each charge!)-but still giving me a theoretical 30 minute flight time!
  9. Yorkman
    Hi Nick and Peter got my head spinning with all those figures. First, to put things straight-8.4v from a 2s lipo, surely? Model is a GAD Mosquito, 32" span, 14.5 or 15 oz flying weight depending on 1800 or 2250 lipo. Just been out this morning and got two flights in on the two packs-8 minutes straight on the 1800 pack, now 'open circuit' voltage of 7.7 volts. Had 2 four minute sorties on the 2250 pack (landed to adjust ail expo)-voltage remaining 7.82. I'm assuming my voltmeter is somewhere near correct, I have no reason to doubt it. Oh, I must confess I am pretty gentle on them whilst flying-I don't drill around the sky on full chat the whole time, but tend to 'cruise' more, kind of medium throttle/speed flyby followed by pull up, roll, cut throttle again, cruise round for the next pass...sorta thing.
  10. Yorkman
    Posted by Clive Matthews on 22/02/2010 11:09:37: Part of the problem is that your voltage reading will have been off load.   As I said-according to Timbo's chart-which I'm pretty sure is 'offload' voltage. Unfortunately the weather's turned, so no flying at the moment-if I get a window I will investigate further.
  11. Yorkman

    Yorkman posted a gallery image in Member Albums

  12. Yorkman

    Yorkman posted a gallery image in Member Albums

  13. Yorkman

    Yorkman posted a gallery image in Member Albums

  14. Yorkman

    Yorkman posted a gallery image in Member Albums

  15. Yorkman
    Don't believe it myself-in fact did wonder if I checked the correct battery! Will do some further flying and testing-oh, btw, in its previous incarnation with bigger motors and stratospheric (as opposed to merely ballistic) performance, was flying for 10 minutes no probs...
  16. Yorkman
    Actually Tim I'm in Andover,so a bit closer than you thought! The 'York' refers to that model flying by in my avatar...
  17. Yorkman
    Where are you Tim? I've got a twinstar cluttering up my shed that needs a home!
  18. Yorkman
    Hi Christian. I fly from a field 10 minutes from Devizes. In fact was flying the Mossie there this evening. I'm not local any more, but I can put you in touch with the man who organises it if you like. During the summer it's mown short enough for the York to go off its wheels (well, you wouldn't want to hand launch it!). You can fly any time, just watch out for full-size. Where are the two sites you've found, if you don't mind me asking?
  19. Yorkman
    Flew the Mossie today (she's sorted-hurrah!) for eight minutes on a 2s 1800 lipo. Just checked the voltage of said lipo-7.83 volts. According to Timbo's charts, that means it still has more than 80% charge....or, I've used less than 20% of the charge-theoretically making 40 minutes possible? Or am I mistaken?
  20. Yorkman
    Did you notice the size of the nosegear door? I thought it was the bomb bay at first!
  21. Yorkman
    Thanks mate
  22. Yorkman

    Yorkman posted a gallery image in Member Albums

  23. Yorkman
    came up with a cunning plan.....the 'Coota' amphibian my gorgeous Brazilian wife bought me for christmas has removeable wheels, which masking taped beautifully onto the Mossie nacelles...a sacrificial ventral fin/tailskid, and we were ready to go! An empty stretch of tarmac road on the edge of the plain-and off we went. First attempt, she left the ground, but immediately obvious c/g too far back (which is what did for #1)-it's obviously absolutely critical on this model-but as she fell into grass from 3' altitude, just needed a dust off and remove mud from props. Shifted battery 3/8in forward, tried to calm my nerves, and went for it again-success!! we had a flying machine!! Absolutely no assymetric thrust issues, flew like on rails-and after a couple of minutes (it was flippin cold!) managed to put her down safely back on the tarmac. Let's hope that's the first of many.Edited By Yorkman on 07/02/2010 16:43:56
  24. Yorkman
    I have managed to get something workable. Throttle/rudder are mixed 80-125, whilst rudder 'sub-trim' is set to 98 (I think...will check later). With the model mounted on a swivelling base, motors now start together and there is no noticeable 'swing' any where through the rev range. An added 'bonus' !? is that I have yaw control as the rudder control throttles the stbd engine separately. The only issue I haven't been able to overcome is when the battery is connected, the stbd esc thinks that the tx 'throttle' control isn't fully closed, so beeps away until I give a flick of right rudder, whereupon it shuts up and everything works fine. So I'm running out of excuses to not test fly the thing......
  25. Yorkman
    I hardly ever fly the York-it needs short grass (I don't live near the strip so am beholding to the local man-thanks Mike!- to mow it) and I haven't had a vehicle I could sensibly transport it in for a couple of years, so it's a bit of a faff just getting it to the field. I never fly my old Teakle ASW17 or Wik Salto-they are there (well, at the in-laws) but since going electric, slope soaring is also too much of a faff. What I've been trying to fly regularly-the Mosquito-kept crashing, but the third incarnation is just about ready to go, and the missus got me an Art-Tech Coota for christmas, which can be chucked in the car and flown anywhere-though we're still looking for a suitable lake! Oh-and the Twinstar never gets used any more-as someone earlier said-yawn!Edited By Yorkman on 06/02/2010 16:36:55
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