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Type: Posts; User: BMatthews

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  1. That video had me totally sucked in until the guy...

    That video had me totally sucked in until the guy belts the part with the big mallet. Saw it first time some years back and it still makes me smile to see it again and again. Truly excellent British...
  2. A steam jet from a kettle makes short work of...

    A steam jet from a kettle makes short work of warping the wood back straight.

    As for the wing angle I'm still as confused as DaRock. Are you talking sweep back or dihedral? Give us a little more...
  3. A datum line is not an aerodynamic reference. ...

    A datum line is not an aerodynamic reference. It's a convenience for the designer. On the other hand the model will fly to where the wing is angled to the degree needed for generating the lift...
  4. Pictures of the model or links to the maker would...

    Pictures of the model or links to the maker would help a lot. The options for both issues all depend on how it's designed and built and if it's already covered or not. Also just how big is the warp?
  5. You're looking for a way to find out where to...

    You're looking for a way to find out where to balance the model.

    Using your square works but you MUST make sure that the lower wing is sitting at a 0 angle before you start. So that's the...
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    Yep, the idea of moving the CG to suit the flyer...

    Yep, the idea of moving the CG to suit the flyer is a good one. Some like a little more positive pitch stability and others find they like a more minimal amount. Shifting the CG and doing the...
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    780

    That might work for an engine with a fuel pump or...

    That might work for an engine with a fuel pump or with a pressure bladder. But for direct draw or the usual muffler pressure tank you can`t do that. The tank has to be as close as...
  8. It says it weighs in at 30 oz as a glider. Your...

    It says it weighs in at 30 oz as a glider. Your battery and motor will add around 7 to 8 oz. But you're removing 2.5? oz with the airborne pack? So lets say it comes in at 36oz for giggles.

    ...
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    This could be anything from a hot flying 19 inch...

    This could be anything from a hot flying 19 inch Littlest Ugly Stik up to a slow and lazy 40 inch powered glider. What sort of flying style, performance and flying speed are you looking for? And...
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    Speedster, given that you showed all the options...

    Speedster, given that you showed all the options and used the same plane in the same conditions I'd count this as an excellent video for comparing the different options.

    Thanks for the time you...
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    There's no doubt that the rear motor will be...

    There's no doubt that the rear motor will be running at less than maximum efficiency due to a number of factors. First will be due to operating in the wake of the forward prop. And second will be...
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    That's pretty neat! You're not going to get...

    That's pretty neat! You're not going to get 400mph out of a tree line but it's keeping the model up in fine style.
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    Did you read on the web site where the suggested...

    Did you read on the web site where the suggested battery pack was only a 2S pack? With a 3S pack the voltage is high enough that with that prop you're obviously forcing the motor to draw well in...
  14. I think those guys are still out there. But for...

    I think those guys are still out there. But for the most part the PURE glider guiders are focused these days on contest flying. And I've noticed a pretty big shift away from the contest crowd here...
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    Well, consider that he didn't correctly follow...

    Well, consider that he didn't correctly follow the plans in the first place.

    The drawing clearly shows a thicker 6mm foam for the lower surface, a foam filler and tube spar and a THINNER 3mm top...
  16. Thread: Weird Plans

    by BMatthews
    Replies
    3
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    265

    Uncle Willy on ebay wasn't the first to ignore...

    Uncle Willy on ebay wasn't the first to ignore copyrights or even common decency and respect to the original designers or publishers and I'm sure he won't be the last.
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    The shape of the airfoil does not affect the CG...

    The shape of the airfoil does not affect the CG location. That's been mentioned already. The desired CG location is set by the tail area and distance it is located behind the wing and the wing's...
  18. In your thread about this over on RC Groups I...

    In your thread about this over on RC Groups I read it as being 130 INCHES wingspan. 130 CM makes a LOT more sense.... :D

    Try and keep the weight closer to 1Kg. The lighter it comes out the...
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    Such rod when cut to a taper is likely the source...

    Such rod when cut to a taper is likely the source used by a lot of the fairly common generic replacement needle valve and spray bar setups that were sold for older control line and free flight...
  20. Thread: Vampyr!

    by BMatthews
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    426

    Yep, that sure is a.... uh..... um..........

    Yep, that sure is a.... uh..... um....... "DISTINCTIVE" looking design..... :D

    You've done a superlative job on a very rarely modeled prototype. I hope that it flies even half as good as it looks...
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    I KNEW you couldn't control yourself from...

    I KNEW you couldn't control yourself from improving things...... :D

    But you're right. The model will be better for it. Not only the looks and streamlining but also the way the prop blades fold...
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    You need to make a request to one of the...

    You need to make a request to one of the Community Moderators. Us normal forum mods don't have access to such tools.
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    All else being equal making the airfoil a little...

    All else being equal making the airfoil a little thicker like this should delay the stall by a slight amount.

    The reality though is that you likely won't see any change at all. Especially since...
  24. Well, that sucks. I wish you luck in finding...

    Well, that sucks. I wish you luck in finding someone else to get the cutting done.
  25. What about the guy suggested in the "kit cutter"...

    What about the guy suggested in the "kit cutter" link?

    I personally know Nigel Tarvin and his standards. So if he's giving a link to Larry Katona on his web site as a suggested kit cutter you can...
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