#101
|
||||
|
||||
It won't be the first 3 images because they are not on a B-25, looks like B-24 nose gear which was rather shorter than B-25's nose gear.
__________________
Screw the rivets, I'm building for atmosphere, not detail. later, F Scott W |
#102
|
||||
|
||||
This PDF of a 2015-2016 article by a Jeff Thatcher, son of David Thatcher who was one of Ruptured Duck's crew, may be of interest.
Found it just now while playing in Google out of curiosity. http://www.childrenofthedoolittlerai..._My_Father.pdf Their website seems a good place to inquire; Children of the Doolittle Raiders | Organization Information Quote:
__________________
Screw the rivets, I'm building for atmosphere, not detail. later, F Scott W |
#103
|
||||
|
||||
Another random Ruptured Duck find, https://www.prddesign.com/about
Quote:
__________________
Screw the rivets, I'm building for atmosphere, not detail. later, F Scott W |
#104
|
||||
|
||||
Thank you Scott,
You're correct, never thought of comparing the different views, it does look like a B24 or something rather than the B25. Will work on it some after work tonight. Not sure on the rubber band system going to use, have thought of a different type of shaft drive system. Or just angle them like some of the other designs. Thank you for your research to answer my questions. Mike |
#105
|
||||
|
||||
Welcome! As you may have deduced by now, I enjoy doing that as a recreational activity.
__________________
Screw the rivets, I'm building for atmosphere, not detail. later, F Scott W |
Google Adsense |
#106
|
||||
|
||||
Still working on the B25B model.
Spent most of the evenings working on the canopy-front bombardier's wind screen. Boy is that fun, will need to print some out to test how well they line up. For three nights tried to get the proper length to fit the sides before any printing. After several frustrating tries, finally the light bulb went off, simple triangle calculator found my answer. Had given up for the night, turned the design computer off and was getting ready for a movie. My mind wouldn't let it go, then just, like a light a light bulb lighting up the darkness, realized that this was just a triangle question, both computers back up and running, one for internet, other for designing, input the numbers into an on-line calculator and there was my answer. Worked perfect. How did I ever survive math without the net? Not really very good at math, rely on programs for my answers... Have not done any math like that for years, to say I don't remember would not be exactly correct, don't even remember what grade it was that I learned about triangles. Now for the bottom fuselage and almost time to downsize model for printing. I draw all my models at full scale, then scale down for printing. All kinds of ideas now for a rubber band system for power, might try them all to see which is the most efficient. Something like a propeller driven tractor pull might be in my future. Mike |
#107
|
||||
|
||||
You know that means you have to spend more time flying; aw man, flying models are such a burden.
__________________
Screw the rivets, I'm building for atmosphere, not detail. later, F Scott W |
#108
|
||||
|
||||
B25B Nose Job
Well, after several tries, finally learned how to make lines for the canopy and bombardier to line up in a 2D drawing.
This was rather difficult, took most of today and parts of yesterday. I did learn a way to do it though. Have some touch up to do, but here is what the B25 nose section looks like after printing a test plot to see how things are lining up. The book? very 1st printing just released this month, Paul Dye is a member at a different forum. He has some very interesting careers, he also fly's a Vans RV airplane kind'a like mine. He also has a little one person jet... Here are the photos of the nose section construction: Now I can go to the airfoil and finish some other odds and ends before a final print and build. Still thinking on the drive system, thinking now favors the u-joint or wire u-joint methods. Mike |
#109
|
|||
|
|||
"Still thinking on the drive system, thinking now favors the u-joint or wire u-joint methods."
Have you considered using bicycle brake cable (or a lighter version of it) as a torque cable? seems simpler than trying to make little u-joints. the cables we have now are looser in their sheaths than what our predecessors had available. I keep envisioning a single rubber band with a reduction/transmission that has two outputs (I think the B24 example you shared had such a thing in the nose). with the big and slow (compared to scale) propellers, counter rotating might be a necessity. A twin rubber band solution might be simpler, but heavier. Watching with great interest on this one.... |
#110
|
||||
|
||||
Quote:
A very small wire rope might work. Something to think about and look for. Small enough dia., the ends could be formed into a loop using super glue and some thread to tie it together instead of a nicro-press sleeve. Sure would simplify everything, for a little weight penalty. Thank you for the idea! you are correct. The two rubber band idea would weigh quite a bit, would need two have two tubes instead of one, everything will double. The P38 Lightning was easier as a twin for sure. Plan to post later on about the triangle issue. Seems simple now, but it had me going for quite some time. Mike |
Google Adsense |
|
|