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Type: Posts; User: BMatthews

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  1. Replies
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    3,311

    That was HILARIOUS! You're just having far...

    That was HILARIOUS!

    You're just having far too much fun..... :D You have got to be the master of making the most out of the least when it comes to finding and using any possible slope and wind...
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    88

    That's most certainly a thermal soaring model. ...

    That's most certainly a thermal soaring model. As suggested by all means use it for some slope flying but don't be surprised if anything more than a light to moderate wind causes it to become almost...
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    312

    The ability of the big heavies to create such...

    The ability of the big heavies to create such vortices is why there's a wait time after a heavy takes off or arrives before smaller planes can use the runways.
  4. It doesn't matter how you set the pivot line as...

    It doesn't matter how you set the pivot line as long as you have 25% of the area ahead of the pivot and 75% behind. If you pivot along the 25% chord line, which is a swept line, then your pivot axis...
  5. Speedracer, I suspect you might have hit the nail...

    Speedracer, I suspect you might have hit the nail on the head with the reflexing to aid knife edge flying.

    And truth be typed I was thinking "Extra" when I posted the first reply. Looking at...
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    255

    I found some various pictures that should...

    I found some various pictures that should illustrate the idea.

    First is the way the spar caps are webbed front and back to form receiver boxes in the wing panels. Ideally these should extend out...
  7. The Edge design has a fairly radical amount of...

    The Edge design has a fairly radical amount of wing taper so it will tend to want to tip stall if you're not careful. I suspect the previous owner angled the ailerons up a little to try to simulate...
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    192

    If you use aluminium for the load bearing tube be...

    If you use aluminium for the load bearing tube be sure it is a heat treated aircraft grade alloy. Something with a T4 or T6 treatment so it has proper yield ratings. Otherwise it can bend and take...
  9. No, that isn't really anything. At the root it...

    No, that isn't really anything. At the root it is close to the 25% chord but at the tip it's just about at the leading edge. So it's really not anything at all to do with the planform geometry.
    ...
  10. Replies
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    481

    Kinkos is far from the only place to get full...

    Kinkos is far from the only place to get full size prints. Check graphics suppliers in your area. Anywhere that architects get their plans printed will do our model prints. And all but the...
  11. If your sketch is of the shape you're building...

    If your sketch is of the shape you're building then the curve and angle at the tip isn't going to be enough to matter. And if you use the MAC indicated by the diagram you posted the slight bit of...
  12. Replies
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    481

    There's a sticky at the top of the titles page...

    There's a sticky at the top of the titles page warning about the current operator of RCM Plans.

    Outside of that there's Air Age which still handles a lot of the last few decades of plans that...
  13. Replies
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    4,289

    Yes and no. Again much depends on the angle of...

    Yes and no. Again much depends on the angle of attack and the shape of the airfoil.

    In the full size world the whole range of "laminar flow" airfoils to produce less drag is based on shapes...
  14. Thread: red wood

    by BMatthews
    Replies
    11
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    224

    The few times I've handled redwood I didn't find...

    The few times I've handled redwood I didn't find that it was all that strong. But then much depends on the growth ring spacing just like with spruce.

    For stringers I prefer woods with good...
  15. Replies
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    255

    The length of the joiner needs to be considered...

    The length of the joiner needs to be considered along with the strength of the spars. Certainly a tube or rod that extends 1/3 of the span into a panel is something I'd consider rather extreme. If...
  16. With ailerons you certainly don't NEED dihedral. ...

    With ailerons you certainly don't NEED dihedral. But as mentioned above often wings with no dihedral at all look like they are drooping. So I'd stick in a couple of degrees just for giggles.

    The...
  17. Replies
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    175

    For that size if you expect to build it a little...

    For that size if you expect to build it a little heavy you may want to consider the Selig 8036 or 8037. These were originally designed for use on some Top Flite scale kits. The idea being that at...
  18. Replies
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    Somewhat photo heavy? Maybe. But there's no...

    Somewhat photo heavy? Maybe. But there's no doubt it would serve as a textbook like resource for anyone building a Speedy Bee or a good example of any open framed style of build. Nicely done! ! !...
  19. Replies
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    1,025

    Somewhat photo heavy? Maybe. But there's no...

    Somewhat photo heavy? Maybe. But there's no doubt it would serve as a textbook like resource for anyone building a Speedy Bee or a good example of any open framed style of build. Nicely done! ! !...
  20. Replies
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    196

    The wing's width front to back is called the...

    The wing's width front to back is called the "chord" of the wing or "wing chord". The 18 to 22% location for the balance point refers to balancing the model at 0.18 to 0.22 times the chord dimension...
  21. Airplane fuselages are much more free form than...

    Airplane fuselages are much more free form than the mechanical part in your you tube link. Often they don't even use the same section over their whole length. So we need more data than we get from...
  22. Replies
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    There is very little weight to be saved by...

    There is very little weight to be saved by cutting away the foam. And in fact it gives the sheeting a spot to crumple inwards and produce a failure.

    On your airfoil. I hate to say this but...
  23. Replies
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    It shouldn't since the wing likely came off a...

    It shouldn't since the wing likely came off a model that would have been heavier originally. A 44 inch span with the chord it appears to have will fly just fine at 2.5 or so lbs. It would be...
  24. Replies
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    Well.... sort of.... The stability margin is...

    Well.... sort of.... The stability margin is still set by the wing chord percentage that you locate the CG ahead of the NP. It doesn't matter if the NP is at 35% or 100%.

    Mark Drela once...
  25. I understood that finishing resin is unwaxed...

    I understood that finishing resin is unwaxed because it's meant to be sanded after it cures. So it would be fine for laminating doublers. Mind you so would epoxy.

    Polyurethane glue, is...
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