Is that a rule now? If so then I am...Here's a new thing, the last pic in the thread needs to be a reenactment of the first sim pic in the thread
Is that a rule now? If so then I am...Here's a new thing, the last pic in the thread needs to be a reenactment of the first sim pic in the thread
Weighed the finished rocket at 2.7 oz, vs. 2.4 in OR. Not bad. Still building a bit heavy, maybe just all the glue and paint. CG came out about an inch behind OR. Still yields a bit over 1 caliber stability with a D16, so I'm feeling pretty good about it.
*Hoping* to launch it next weekend.
Hoping for a straight trail and soft landing!No first flight will be a C6 or C12.
I never thought of this until just now: what if one edited the parts and materials databases to account (approximately) for the weight of finished parts? Instead of weighing, for example, a foot of BT50 and entering the observed mass per length, do that to a piece that's been filled, sanded, primed, sanded, etc. How much closer to final weights and CGs could one come that way?Still building a bit heavy, maybe just all the glue and paint.
That is certainly doable, although plenty of work to figure out the numbers. Also, different folks finish things differently, so there are a lot of variables to take into account.I never thought of this until just now: what if one edited the parts and materials databases to account (approximately) for the weight of finished parts? Instead of weighing, for example, a foot of BT50 and entering the observed mass per length, do that to a piece that's been filled, sanded, primed, sanded, etc. How much closer to final weights and CGs could one come that way?
I do already have a custom material for 1/8" papered balsa, since the papering adds very noticeable weight. I use it for 3/32" as well because the density difference is small, and I don't mind slightly overestimating the weight of the wood in the tail. But I haven't factored in finishing or glue, beyond that.It certainly wouldn't work for bulk materials. I don't know about OR but I guess it's probably the same as RS in that for many items one specifies a bulk material, like Balsa for a fin for example, and then the planform dimensions and thickness. One would have to change that to 3/32 balsa, 1/8" balsa, 5/32" balsa, etc. each as different materials. Maybe worth it if the results are good.
The flight was OK, but weathercocked into the gusty wind and didn't fly as vertically as I would like.
More reason to build a rocket ROOM.The rocket wall is running out of room.
I kind of suspect that you have a secret lair inside a dormant volcano to store all yours.More reason to build a rocket ROOM.
Good fin-body adhesion gets a bit more important with that D10! More likely to approach "the speed of balsa"!Here's the launch phase of the D16 thrust curve:
View attachment 393514
That's a darnsight better than a C6, but if weathercocking is really your worry, compare it to the D10:
View attachment 393515
I kind of suspect that you have a secret lair inside a dormant volcano to store all yours.
More likely to approach "the speed of balsa"!
How do you do it Neil do you have some Galactic powers?And here's a more proper overview of the design:
View attachment 384395
Some notes:
1) Those paying attention may notice that a number of changes have been made since last I fussed over it over in my half-baked design thread. I had more trouble finalizing this design than any other I've worked on thus far, and can't say for I'm totally satisfied with it even now. But I'm happy enough to move forward with it. Huge thanks go out to @Nytrunner and @jqavins for their help in getting me to this point.
2) I originally intended this to have a 24mm mount, but I became frustrated with the retention issues (don't like friction fit) and so downgraded to 18mm. Due to the dragginess of the design, OR doesn't seem to think it'll go very high, even on a Questjet D16. I've got an altimeter bay up front, so we'll see. I think OR is being a bit pessimistic here. Still, this thing isn't going to win any altitude competitions.
3) I made this rocket one click too small. One size bigger would have made a 24mm mount straightforward, and also some of the bits of fabrication would have been a lot easier. Unfortunately I realized this too late to change.
4) In contrast to all my other builds, I'm doing massive amounts of parts preparation before actually putting stuff together. We'll see how it goes.
My power, if you can call it that, is that I can't spend as much time building as I would like, so I focus excess energy on designing instead. I would gladly trade, or at least rebalance, if I could.How do you do it Neil do you have some Galactic powers?
How do you do it Neil do you have some Galactic powers?
Enter your email address to join: