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catchrow

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Everything posted by catchrow

  1. KS, Do not despair!! Look at this in a methodical way: Option 1 adds even more weight to the aircraft Option 2 removes weight and restores desired effect Option 3 is a lot of work, especially when you already have a perfectly good set of elevators (with the only problem being, they were painted wrong). Answer: rub the paint back to the glass (or , if you are careful, the primer so as to avoid re priming) and paint again. After 10 years, whats another 2 hours of prep and paint?!! Aircraft get repainted all the time. its what happens. Please dont waste your tiem re buildingthe elevators, we want to see your plane finished and flying. Row
  2. Yes there is! Flaps, leading edge devices, section coefficient..... (ok, ok so S gives you more bang for buck for the equivelant cost, but where is the fun of flaps?) For all the non aeros out there, you are trying to manipulate the lift equation to maximise lift, so S and Cl are the two terms you play with...easy! And good to see the man is addicted to canards..... Cheers all, Rowan
  3. Fernando, You could make the u/c bow yourself, but what a waste of time!! Also it would take some skill to be able to pack that much fibre into the mould and get a good fibre/volume ratio... Goto www.ez.org and follow the links to suppliers. featherlite still make and supply the bow at a good price (Long EZ bow is about $500USD, so A Veri bow would be similar, maybe a little cheaper). failing that I have a brand new, never used VERI -EZ bow in Australia that you could have at a reasonable price + shippling. Cheers, Rowan
  4. It is a great solution. I love simple and neat!!!
  5. Tmann, Great job- clever solution.looks great. I have been thinking how to do a similar thing. How positive are the doors when they are open? i.e will the handle crosswinds during takeoff/ climb out and stay open so that the wheel will not jam? Cheers, Rowan
  6. "lowering the canard 2" does not seem to have any effect in the way they fly. but it would make it hard to fit in an electric nose lift. the E racer uses hydraulics for the nose gear so it does not interfere with the canard." Lynn, nice pickup on the nose lift! I hadn't thought of that. Usually the canard is set in such a position such that the wake flows either over the top surface of the wing or the lower surface all of the time, through most of the pitch range. If the flow is switching from top to bottom, then you get undesirable changes in flow over the main wing. This could cause problems in stall, control surface response etc. I havent decided on the move yet, it will depend on the outcome of a thorough analysis. Cheers, Rowan
  7. Wayne, You are right, but at this stage, as I am using existing aircraft empty weight,all that stuff is included. This is also why the pre-build w&b is a good guide only, or as you say, you go and do an awful lot of research! I am fairly happy now with my spreadsheet- it shows that the configuration can work.I have the cg mid range at 101, which is as good as any place to start. As I progress I will add more detailed data until we get to the final weigh-in.By then the spreadsheet should be full of stuff and fairly accurate. Sometimes I have to remind myself its an experimental and not a normal cat aircraft! Still its all good practice. The canard move is all about moving the canard location down 2"- not changing the geometry of the surface, as much as i would like to (10 deg sweep would look cool), because again, too much analysis- see prior post re design. Moving the canard down allows for reshaping of the top deck and removing the one ugly feature ofthe long- the 'boxiness' of the fuselage around the canard in the transition to the nose. Some pl deal with this really well, others seem to build to plans. I think I have two approaches which could deal withhte problem, lowering the canard is one. Thanks again for the input- keep firing away folks,I do appreciate it. Cheers, Rowan
  8. Guys, Thanks for the feedbacK. As an Aero engineer, I live on numbers and analysis! Thats why i want the weights of the stuff listed above. I appreciate that estimated weights and actual weights will change- thats why I was hoping there would be a few people willing to share component weights to do an analysis and set some typical bounds. While I havent cut or built anything for the plane just yet, its a good time to do the check calcs for all these mods. Better to highlight a potential problem now and implement a design fix rather than later when it requires major surgery! Call it 12+years of experience in the industry (design, composites, windtunnels, flight test and certification)- ALWAYS GET CETIFICATION AND WEIGH AND BALANCE SORTED EARLY IN THE PROJECT!!! I am not moving canard positions etc at this time. I would like to lower the canard by its thickness, and maybe stretch the fuse, but then I would have to re-calculate everything. If I am going to that much effort, I may as well design from a clean sheet of paper :-) (which is a future project). So aerodynamic centres are staying put. (the vertical canard posn is till up for grabs). I will be widening the fuse at the pilots bulkhead (2"? have read a lot on what everyone else is doing)as I'm quite broad at the shoulders, 6'1ish and in that weird weight measurement, around 210lbs. I have checked bending moments and its right onthe edge of dont worry about it and reduce manoeuvre g factor, vs add a ply and abit. Re Mods: It is in many ways a good time to build, now that everyone else out there has pretty much done it all! Although it is also a trap- If I incorporate all the good mods in the build, how can I measure improvement?!!!! I will post a list of proposed mods at a later date for the group to peruse and provide feedback on. Cheers, Rowan
  9. Hi Forum, I am doing my homework (strange i know!!) before the long anticipated build begins in the near future, by doing a w&b estimate as there will be a few mods based around mainly, O-360, elect nose/speed brake, longer nose, me in the front (wide we go!- calcs already done for wing bending moment etc). To this end I have the following data for a check w&b pre build: O360: add 80lbs typical @ fs140 (over a 0-235) Battery (original): 20lbs @ fs19 New Battery 22lbs @ wherever it ends up (0-15" mine will have a long nose) Fuel xxxlbs@ fs104.5 Oil 8lbs @fs140 Pilot , pax etc i I have, question: how do these numbers above look please? Also does anyone have an estimate on : Propeller (40lbs? at what fs?) say a typical 3 blade job. Prop extension: weight and locn? Spinner weight A typical avionics weight (equip at inst panel) Baggage pods: empty weight and full weight , locn I will be adding a Willheimson Electric nose lift. what do they weigh? Also Could a couple of people please give an indication of a typical empty airframe weight (sans fuel, oil etc notewhat toys are in it) and more importantly, fs location for the empty aircraft? This will give me a better idea of a bare weight to use as a baseline for my spreadsheet. It would be great if we has a spreadsheet of members planes with this sort of data for everyone to access :-) Thanks in advance, Rowan
  10. Thanks forthe research and reply- I definitely have a Veri bow. I will follow up on the Featherlite lead. Thanks .....anyone need a veri bow?
  11. Hi Guys, I have acquired a main u/c bow for either a Long or A veri, the old owner wasn't sure. I am building a Long, so need to make sure I am using the right one! It is completely bare, so isthere any distingushing features? It weights about 17 lbs. If it is veri, does anyone know where ican get a long one from? Thanks, Row
  12. Hi Guys, I am based in Melbourne , Australia, but am currently in Africa on a world trip. In the period 10-14 Aug i will be in Dayton Ohio,*(Beaver creek...) catching up with friends. If possible, i would like to hook up with a (good!) pilot and owner of a long ez and go for a fly. Would you know how to help me, or who I could contact please? I hear rumours of ez associations in that area? Any help you would be able to give so that I could go for a flight in an ez would be very much apperciated! thanks in advance, Rowan Rowan Geddes Melbourne Australia
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