Paper is denser than wood. Where's the problem?Something doesn't seem to add up on the bottom right; perhaps it's me.
1/16" basswood, before paper: 0.297 oz/in3Paper: 0.476 oz/in3, which is more than the wood!
Paper is denser than wood. Where's the problem?Something doesn't seem to add up on the bottom right; perhaps it's me.
1/16" basswood, before paper: 0.297 oz/in3Paper: 0.476 oz/in3, which is more than the wood!
In my brain. I've edited the post away, as I found my own error moments before you posted. Would that you had not read so fast, my foolishness might never have been discovered.Where's the problem?
In my brain. I've edited the post away, as I found my own error moments before you posted. Would that you had not read so fast, my foolishness might never have been discovered.
(The error, for the record, is that although the table clearly listed standard (volumetric) density, by brain processed it as area density, oz/in2 or g/cm2. 11 mil thick paper can't be heavier by area than 62 mil thick basswood. And the calculations on the left side clearly show that it is not heavier, so the right side had to be wrong. But all that is irreverent, since it's all related to the wrong quantities.)
I did a strength test on the wood glue papered fins. It feels so strong I just had to know how much stronger.
I tested the bending strength, in the weak axis, bending it along the wood grain.
The raw 1/16" basswood piece failed with 851 grams of weight. The basswood snapped into (2) pieces.The papered 1/16" basswood failed with 6,988 grams of weight. The basswood snapped, the top paper ripped across, the bottom paper was still intact.
So that's about an 8:1 increase in bending strength. Pretty amazing, right?
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Similar, but not the same for sure:
Shame RP is gone (for more reasons than just this example). . .I'll have to figure out what the heck the acronyms I was using meant. . . DOH!!!!
I was doing the water bucket method the whole time. Apparently I was losing hair back in 2011 and never noticed. Oddly enough, I'm currently wearing those exact glasses (blue color clued me in) as I grabbed the wrong pair the other day and these are the backup. I'd say that means I'm doing awesome eyesight wise, except i have to backspace every few characters to spell the words you're reading as well as I have so far. My fingers are getting tired!!!!
Sandy.
Sandy,
So the test you posted, it was used to compare different adhesives being used to attach a fin to a body tube?
I'd love to glean some information from the video, but as presented, I can't.
- What was the material of the fin?
- What was the material of the body tube?
- What is USC?
- What is CA1?
- What is CA2?
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I've been thinking about how to swing test the "Luke and Vader Dog Fight Rocket" such that the string at the CG won't buckle the interconnecting tube.
Think this would work, or will the extra mass result in a bogus test? My mindsim say it should work as long as the CG is representative of the flight ready rocket.
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Broom handle seems like it would weigh a bunch. If nothing else, it would be harder to get swinging, I'd think. Maybe some used motors glued together. I think you're wise to be concerned, though. Not sure i would have thought about it before kinking it. Maybe if the motors or broom stick are too heavy for practicality, you could split a few tubes lengthwise and snap them over the outside of the real tube and tape them back together.
Just a few thoughts, not sure if they are valid at all.
Sandy.
Any chance a Kite like bridle (one string attached at two points, one fore and one aft) with your main line attached to the bridle would work?
Wow! Vader's TIE is a real drag queen!
Be cognizant of Booster motor lift off capacity. Don't want to stage too low or without enough momentum resulting in a veered staging.
The drag will be less in the thin Rocky Mountian air on a hot, dry, summer's day. Like me droogs say; the mindsim is as clear as the azure sky of a mid summer's day. Time for a little ultraviolence down in the trench and then off to the Korova Milk Bar for some milk plus. I like mine with drencrom, but vellocet is nice too.Didn't he wear a black dress? I'm not judging, merely an observation. Rumor has it he started Trans World Airlines.
All good points:
D12-0 Motor Lift Off Capacity: 14 ounces. Rocket weight 10.5 ounces.Stage SeparationAltitude: 83 feetVelocity: 44 mph
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With this rocket Vader could show up in a pink sith suit and the ultra conservative, hardened Cold Warrior Top Men would grant a pad assignment to see it fly! With a new an interesting rocket they all seem to find their deeply repressed, inner oddroc scuminess.Didn't he wear a black dress? I'm not judging, merely an observation. Rumor has it he started Trans World Airlines.
All good points:
D12-0 Motor Lift Off Capacity: 14 ounces. Rocket weight 10.5 ounces.Stage SeparationAltitude: 83 feetVelocity: 44 mph
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It whistles with the rear deflector shield engaged! Only Vader gets hyper drive and deflectors on his TIE fighter.
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