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Underwood

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Everything posted by Underwood

  1. Underwood
    Small ducted fans are very inefficient and though only used for a small portion of the flight the aircraft has to carry the weight of them all the time even when they dont provide any lift or thrust, add to that the compromised wing structure that will incur a further weight penalty and the mechanism to retract and extend the wing section and its just more snake oil.
  2. Underwood
    Well it has an alternator as standard (produces AC), but if you mean a car type alternator with a built in reg/rec then yes you can fit one.
  3. Underwood
    How long is the Warranty?
  4. Underwood
    Rotax 912 with Ducati Regulator/rectifier....normaly fitted with a light that comes on when the master switch is engaged and remains on till the engine's generator is producing sufficient voltage then goes off. on shutdown of the engine the ligght will come back on untill the master is turned off. A quick question to those who have the above with a capacitor across the regulators output, when you switch the master off, does the charge indicator light go off immediately or does it slowly fade out taking a second or 2?
  5. Underwood
    This has been in prototype for quite some time now which could be a good thing. It looks the business and a modern all metal light Bush capable Taildragger is very much needed imo. If I could afford one It would be right at the top of my list.
  6. Underwood
    That regulator seems like a waste of money to me. Firstly the claim to provide Anti Lock simply by placing a pressure limit is Bogus, It can only work for one specific combination of ground friction, tyre pressure and weight on wheel, anything outside of that one set of parameters and you are either going to lock the brake or not be able to exert maximum braking force. True anti lock that works in all situations needs a wheel speed sensor. Secondly the other feature of balancing both brake's pressure is a negative one if you want to lock one side to turn sharp. An odd contraption P.S. your symptoms could be the result of leaking internal piston seals, unusual for both to fail the same though unless the wrong brake fluid was used which can wreck some seals
  7. Underwood
    https://www.ebay.co.uk/itm/387325211088?_skw=100psi+10bar++Stainless+Pressure+Transducer+Sensor+Oil+Fuel+5v&var=654583436388&itmmeta=01JTXK10RAC4KBZ4XXCH3HSA0J&hash=item5a2e61b1d0:g:jRUAAOSwLy9iC3sT&itmprp=enc%3AAQAKAAABIFkggFvd1GGDu0w3yXCmi1faiUPSueSOxbzWx0BagonCFC4mNVy8GwHwiPfwv7ku%2FFh%2FYNlWYeIvZf00lLcYfUtx8IlH%2FLkwkI1k43SlgX1ee5GGHcK5oOqqDJufyV0qIEl4kyuegvTh9OKhCtU5ZWuEQK%2FWKajxeTX%2FUsFBoQW1wtCBD8LEWfvM7FfYtD2p7xMS0LW1sjUTjAStTCKQ9j9IGQNrwJTnLDQYJhfhqgAhQzllKlm1l6AaqqQltIflrcbpNIdXms4ZmkgnYjOSog7RajI7h6z%2FZSEGUOIliyrm8IQuzjsW7YKJe7mDY0u3HL4zHtpKvYlcKDxF3W3jz7EduUFUbmLpQEwdvv1utWyr%2BxaCqLpBIFlaa8qpKlpCQA%3D%3D|tkp%3ABFBM3o2Es9dl
  8. Underwood
    Type "oil pressure sender in to Ebay (probably amazon also) and you'll find many oil pressure senders both VDO type and the solid state types equivalent to Honeywell. I bought one of the cheapo Solid state senders to link to an MGL EMS and it worked fine. Have to ensure you get the correct thread (or fit an adaptor) and pressure range.
  9. Underwood
    Hirth made some decent 2 strokes in the 50-70hp range (still do), but they never got enough sales to challenge Rotax in that area. Perhaps now rotax has left that market they may get more of a look in. Seems their is still some interest in the 50-70hp range with SSDR types becoming available to buy like the Merlin https://en.wikipedia.org/wiki/TechProAviation_Merlin_100 and a couple of open structure types that I forget their names right now
  10. Underwood
    EFATO?, looks like the prop was stopped when it hit. What a shame they are lovely aeroplanes, if a little underpowered
  11. Underwood
    Unfortunately they stop making them a long time ago and 503s, even 582s are getting rare to find new stock. Second hand is always an option but I doubt there are many 447s left with much life left in their cranks
  12. Underwood
    UK SSDR spec is 35 knots/ 40mph or under stall The guy at the show with the Ultracruiser was stating 25mph, must be a substantial increase in wing area from the hummelbird to get such a difference in stall speed. perhaps there are also weight savings in the ultracruiser build.
  13. Underwood
    The SSDR class here in the UK allows the choice of engine entirely up to the builder. Someone actually got the smaller winged Hummelbird like yours I believe into the SSDR class, but I don't know how he managed to get the stall speed low enough. perhaps Vortex generators would get it down sufficiently?
  14. Underwood
    Decided to fly in on the Friday Evening so as to avoid the Chaos of Saturday. Been in many times before and it gets a bit daft on Saturday when there are often up to 10 aircraft in the circuit and overhead with at least 3 often more on final at any one time. As it turned out quite a few had the same Idea and it was already busy friday evening. Met some friends and went down the Pub for some food and drinks so a nice evening. Weather was good which is fairly unusual for the Show its often horrible. Trade presence wasnt huge it hasnt been in recent years, mostly new very expensive 600kg imported stuff that to my mind doesnt really fit in the Microlight Ethos. On a more realistic side I did see someone has started selling the Hummel Ultracruiser as it now fits in the SSDR class over here, kit or full builds available, only the engine choice isnt great either a 1/2 VW which are rubbish from what I've seen of one fitted to a bloke I know's Hummelbird or an unspecified V Twin (probably a B&S derivative) Didnt get inspired to take many pics, but here's my Nynja and the Ultracruiser...
  15. Underwood
    Some might say a couple of points should be deducted for not taking out a few golfers but all in all a Great Job saving that one.👍
  16. Underwood
    Great stuff, heres to having many hours of fun👌
  17. Underwood
    I use one of these with the top page just a blank sheet in the clear pocket that I can write on with a chinagraph pencil. https://pilotshop.nl/contents/en-us/p515_Small_Flip_Chart_Flexi_Kneeboard.html
  18. Underwood
    Blue, any update on your 600KG Nynja?
  19. Underwood
    Yes, I have flown into Cardiff a couple of times and though they do now require a flight plan there are no other requirements I can remember.
  20. Underwood
    Presumably only if it's a XC flight and not just circuits at the airfield you have been training at that didnt previously require one up to that point?
  21. Underwood
    Looking to do a Panel refit in a few months time and been looking at the Kanardia gauges, specifically the ASI, Altmeter and the Horis. Anyone got experience of them?, there are a couple of aircraft at my field whose owners have given positive reviews.
  22. Underwood
    But if the outlet valve fails open then when the mechanical pump does the suck part then it can suck through both the Inlet and outlet, surely this has the potential to reduce overall pressure? https://www.rotax-owner.com/en/rotax-blog/item/77-rotax-912-fuel-pumps
  23. Underwood
    Me too, I'm looking forward to the fly-camp season this year, I havnt done any decent adventures since covid as changes of aircraft, moving house etc have got in the way.
  24. Underwood
    Lol, that's ridiculous and typically American. I think If I woke up and looked down at that ground sheet I'd probably fall over
  25. Underwood
    I'm sure you've checked this already but does the problem track voltage on the bus?, I mean is happening when you have lower voltage?
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