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Type: Posts; User: BMatthews

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  1. Replies
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    893

    Hey, I'm mostly taking a semi educated guess at...

    Hey, I'm mostly taking a semi educated guess at this stuff as I go along too. It might be that the 54 would be a great choice. But the 8% thickness puts me off a little as well as my guessing at...
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    You must be young to consider a 25 year old plane...

    You must be young to consider a 25 year old plane as "old" and "historical".... :D I'm still flying models I built that are older than that.

    Age aside it truly is a magnificent piece of...
  3. Dave Thornburg's "Old Buzzard's Soaring Book". ...

    Dave Thornburg's "Old Buzzard's Soaring Book". Written by a model flier for model fliers. I've not read it myself but many swear that this is the bible for model soaring.
    ...
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    Likely as not you'll need to use a Dremel and an...

    Likely as not you'll need to use a Dremel and an abrasive cut off disc. The steel powder that is produced will try to enter the motor and you MUST prevent that from happening. It'll gum up the...
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    The design looks fantastic. And just as much...

    The design looks fantastic.

    And just as much as this is a chance to enjoy the actual design I have to commend you on the detailed building pictures. This thread could easily be used as a great...
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    For a casual climb and for keeping the weight...

    For a casual climb and for keeping the weight down a Park 450 will likely do just fine. To that I'd add a 30 amp ESC for trouble free operation due to the over size rating and a 3S 1300 to 1500mah...
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    Iron Eagle, given that this wing would more than...

    Iron Eagle, given that this wing would more than likely be fully sheeted if a built up method was used I think the sheeting and associated fiberglass and resin for a finish would take care of the...
  8. The only problem you will likely find is that the...

    The only problem you will likely find is that the area of the hinge line along the rear end of the fuselage will need a slip of wood to fill it in that is then shaped to suit.

    From an aerodynamics...
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    If much of any sort of higher speed is going to...

    If much of any sort of higher speed is going to be reached there's also the issue of torsional stiffness to resist wing flutter as well. A really good spar doesn't help much if it allows the wing to...
  10. Thread: Variable CG?

    by BMatthews
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    396

    If that proves to be the case then I'm wrong yet...

    If that proves to be the case then I'm wrong yet again.... :D That's OK. I'm used to it.
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    I'd suggest that some of those options are not...

    I'd suggest that some of those options are not that great for a thin wing on a model of that size. Especially your description of the 1/32 sheet balsa with some carbon and a lighter sort of...
  12. Thread: Variable CG?

    by BMatthews
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    396

    The IDEA has been discussed a number of times. ...

    The IDEA has been discussed a number of times. But the only time I've read about it being used was on a flying wing plank style design. And there were special performance reasons for that related...
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    If speed is your goal then I'd suggest you go...

    If speed is your goal then I'd suggest you go with less camber than the 24 series. You'll find that if you run the numbers for the wing size and even for flying at 100mph that the angle of attack...
  14. Thread: Variable CG?

    by BMatthews
    Replies
    9
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    396

    To have much effect on a regular plane the mass...

    To have much effect on a regular plane the mass will either need to be quite a large portion of the model's weight or it will need to shift over good long distance within the model. You don't say...
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    You're right. There are oodles of pictures on the...

    You're right. There are oodles of pictures on the web but nothing really up close and detailed.

    From the looks of wing tips shots showing the ailerons both in line and deflected I would say that...
  16. I would check the meter on some other shape than...

    I would check the meter on some other shape than a wing and do this same flip to see if the readings are identical. And try it on a few different thicknesses. If the jaws do not have extactly...
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    It's possible that the picture above was taken of...

    It's possible that the picture above was taken of an empty plane other than the crew. With a load of passengers or bombs it would need to fly at a higher angle of attack and likely the fuselage...
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    Pitch IS the primary one I was referring to of...

    Pitch IS the primary one I was referring to of course. That was the core of this thread topic after all.

    Ya know..... given all the work that you've invested in this giant scale model I would...
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    And the "Aerodynamics" forum is an odd place to...

    And the "Aerodynamics" forum is an odd place to be asking. Moved to Scratch Building......
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    This is a very interesting thread and a very...

    This is a very interesting thread and a very interesting subject model.

    I'd like to add a couple of comments if I may.

    First off is the concern over the spiral and yaw stability. The...
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    I loved all the original designs seen in there. ...

    I loved all the original designs seen in there. And some of the truly lightweight models that looked so good really appealed to my free flight roots.

    I know how much time goes into editing all...
  22. Thread: Staggerwings

    by BMatthews
    Replies
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    187

    If you're planning on a hot aerobatic model I'd...

    If you're planning on a hot aerobatic model I'd just go for zero all around for all surfaces and the motor mount. But I'd put in roughly 1.5 of right thrust.

    If it'll be a slower flying model...
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    RCU has a Test Forum just for stuff like this. ...

    RCU has a Test Forum just for stuff like this.

    http://www.rcuniverse.com/forum/test-posting-forum-72/
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    Did I ever get those picture files from you? ...

    Did I ever get those picture files from you? I'll send you a PM with my email.

    CC the way I set up the model in the pictures was to put the balance point a little ahead of what is normally done. ...
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    CAD drawing is coming along. Span has been...

    CAD drawing is coming along. Span has been decided on at 38 inches which gives 290 square inches of wing area. And with mostly air surrounded by a little balsa and film or tissue this looks to be a...
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