Actually you've been a great help in this, so thanks!
Your wise guidance and all your responses in this Thread have been most helpful and insightful.
When it flies, and is successful, I will add you to the list of folks that can take Credit for this Build.
Just your interest has helped keep the Thread going, and that's what inspires me to keep building.
If nobody is interested in the "How, Why and History" of what I'm building then I migh aswell buy a RTF Kit.
Folks like yourself here on the Forum really help me expand my "Modeling Horizons".
It's great when you all can see my progression as a Modeler and have faith in and get behind a project like this.
One more time: for subsonic, unpowered, moveable surfaces, the center of mass of the surface should be on or ahead of the pivot axis to avoid high speed flutter problems. And ahead is much better than on.
If you have squeaked by with your own designs by keeping down flight velocities, more power to you. You should be aware that even at reduced speeds, these surfaces can still run into flutter problems.
But hey, what do I know, I only worked professionally in aerospace as a design and mass prop engineer for 35 years.
Hey Top,
I am waiting for some parts to arrive before I can begin construction of the passive vane section of this build...
I have searched for a profile view of this rocket to assist me in getting as close to scale as possible...
What I have come up with is a 22" sustainer section and a 11" booster section based upon a 2.6" sustainer airframe...
This will make the total length 33"... Are your figures similar?
Do you have any side view technical drawings of this rocket other than what has been posted?
Also, where did you find the 3' to 2.6" transition? How long is the exposed tapered section? Is it located under the rear fins near the end of the sustainer?
Y
I don't know what the measurement is that they are using, but this is supposed to mean something.
View attachment 249282
It says the Dimensions are in Inches, but there's no way!!!
This is exactly what I am looking for... I can get real close with this data...
I think it is inches... Consider the tip of the cone at station 14.0...
Then consider the base of the booster at station 400.0...
400 - 14 = 386
386/12 = 32.17 Feet long (that's probably how long these actually were with the booster attached)
Then consider the booster fins tip to tip... It says 76.6...
That would be a 6 foot 4 inch span.... (seems likely)
Your cone is looking nice...
I'm glad you can understand the Alway Drawing. There's no way the middle of the Sustainer is 183. something inches across.
I can go get the actual dimensions of the missile quite easily from the Okieboat Link.
When you see a drawing that includes Station numbers, that is a reference to a datum point...
The datum point in this drawing starts at 14 inches in front of the nose cone...
The 138 you see is from the datum point...
Right below that number you will see (28.0) with two arrows associated with it...
That is the diameter of that particular section... (and so on)
I may decide to increase the rear section by a small percentage to enhance stability... (we will see)
Did I mention that your nose cone is SICK???
Thank You for both the compliment on the Cone and for explaining to me how the datum point thing works. Now the Drawing makes more sense.
No problem, this information you have provided is one more piece of the puzzle...
So thank you as well...
The passive vane section in my design will include eight of these very small sealed bearings...
I don't know what the measurement is that they are using, but this is supposed to mean something.
View attachment 249282
It says the Dimensions are in Inches, but there's no way!!!
Station numbers... "STA" is the station number, in inches.
The station is a "zero point" either somewhere on the vehicle, or somewhere behind or ahead of it, depending on how the zero point is assigned by the design team. Hence, STA 2.5 would be 2.5 inches ahead of the station point, and STA 7.5 would be five inches ahead of that. It's sorta like the "110 foot level" on the NASA launch towers... 110 feet above the main launch platform deck, not above the ground (considerably higher than that).
If the back end or front end of the rocket is designated with a station number greater than zero, then the station number is somewhere out in front of or behind the front or back end. If the station number is designated with a "negative" number, say "STA -110", that would 110 inches BEHIND the zero point; a station number of say "STA 24" would thus be 134 inches ahead of the "STA -110" point. Make sense??
In this way you can derive measurements for anything on the vehicle by simply adding or subtracting the corresponding station numbers...
Later! OL JR
The sealed mini ball bearings arrived in today's mail...
Just in time for Christmas...
Now I understand it completely instead of kinda' sorta'. Awesome!
Holy Cow! That's Awesome!
Should keep your CG plenty forward too, though this is only a guess as I don't know what those Bearings weigh.
I really like the Design.
Are you going to use some 29mm Tubing to seal the Bearings away from the Gases of Ejection? I immagine that BP Residue would find its way into them eventually otherwise.
The assembly weighs in at 1oz...
Good point on the ejection gases... (that may be an option)
Very nice!
Do you mind if I Cheat, and ask you what you got for Dimensions on the Booster and Sustainer? Minus the Nose Cone ofcourse.
I literally get a Headache when I do even the simplest of Math, and it would be nice to start preparing some Tubes.
I got the Fin Dimensions by Zooming in on the Drawing on my Computer Screen til' the Tube was the same as my Tube held up to the Screen, the Traced the Fins/Wings with Paper held to the Screen. Problem is, my Screen is not large enough to do that to the entire Drawing.
No problem...
I got around 33 inches when I did the math but I am extending the airframe to 36"
The booster will be 3" x 12"...
The sustanier will be 2.6" x 24" including nose...
I think I wil be increasing the size of the booster fins by approximately 10%...
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