What did you do rocket wise today?

Started assembly of an Eggtimer Quantum.

 

Finished the last few Eggtimer kits. Took about two weeks to do the 35 kits.

 

BBIII is ready to go and the Lance Delta is in progress.

 

That Tardis is absolutely brilliant!! Very well done!

 

Finished a presentation I'm giving at club meeting.....tomorrow

 

Been tinkering with solidworks 2011 to see how I can simulate the ring joint that holds the fin assembly onto the back of the motor that is used on the 4 fin Black Brant 2
Hoping to make the ring out of metal so I can attach functional launch lugs to the ring

 

I like the idea of slipping the shrink wrap over the battery leads. I'll have to use that, thanks. Any other tips n' tricks you'd like to pass along? I've got a way to go with the Quantum (mounting the optoisolators now) then a Quark to build after that. Just got my eyeglass prescription updated, so that's a big plus.

 

Just go one step at a time. Also note, the Quark SMD pieces are a lot smaller then the Quantum's. Some fine tip tweezers and a hot iron (650-700).

 

I did get one Quark built previously. Had an embarrassing glitch with it on first use but has flown successfully twice since then. I'm using a Hakko 650 iron with the fine tip which seems to work well.

 

I just ordered some tips for my old Weller TC201. One of them is an 800 degree very small, so a rapid transfer of heat but not a great deal of total heat. Is that a good choice? I have no experience soldering SMT components, but a lot with other stuff, and I've always liked this tip for small sensitive items.

 

Yes. I notice when I put on a very fine conical tip, I do require more heat. I find this to be more true with my older Weller 51 at home. The Weller wx1 that I use at work is digitally controlled and holds temperature much better.

But higher heat for less time works good. A second of heat and the solder flows in nice and smooth.

 

I'll drain it!

 

Prompted by this thread (posts #14 and 15) I had a flash of an idea. Below is a conceptual, not to scale sketch of rail button as seen from an end.

The idea is, it's a launch lug and rail button in one; a rod can go through the hole.

 

Many years ago, Estes sold a "C" rail. A standard lug glued to a dowel stand-off would slide inside the rail, so you could use both the rail or a rod with that set up. I'll try and find some pics.

 

Found some further info from Chris' blog:
https://modelrocketbuilding.blogspot.com/2018/12/estes-c-rail.html

 

Tweezer technique is the primary skill IMHO.

650-700degF (343-371degC) for soldering small parts? What is the rationale behind that? Normal lead solder melts at 183C. You need about 30C more to form the intermetallic bonds. You should not need more than 270C (530F) on a bad day to solder a PCB. The glass transition temperature of the FR4 is around 140C. Higher temperatures just melt the substrate and also weaken the adhesive that holds the tracks and pads onto the laminate. Bad idea to give that a hard time with high temperatures. Higher temperatures also give thicker intermetallic bonds which are more brittle. A good iron and/or as large a tip (chisel, not conical) as you can get away with assists with heat transfer, rather than higher temperature. Iron technique is also important. A fast joint (by using high temperature) is not a good joint.

 

you need an Egg Crate instead of a cardboard box to hold 'em!

Kenny

 

I bought this set of tweezers and they are great!
https://www.amazon.com/dp/B073SJD7L...olid=28MCO3MULBK62&psc=1&ref_=lv_ov_lig_dp_it

 

More progress on the Quantum. Next step is attaching leads to the WiFi module.
I find a toothpick to be a good tool for holding parts in place while soldering. I've got a pair of Dumont 3C tweezers left over from my watch repair days.

 

I started making the plywood fins, centering rings and baffle plates for my Ventris kit.

-Bob

 

My Anycubic Photon came today.

 

The printer didn't come with any resin. Anybody know of a place in Omaha to get 3D printer resin?

 

Primed my Cherokee-E. Contacted the students who want to do a senior rocketry project; meeting on Tuesday.

 

Assembled the fincan for my replacement Tomahawk-12. Tube in fincan, motor mount in tube (with Kevlar Y-anchor and wiring chases), carbon fiber stiffeners in fins all the way to anchor channels on the motor mount.

 

Hey everyone, So after being away from rockets for like 45 years I stumbled back into it after helping my 9 year old with his Cub Scout project.
So after going out and buying a new Estes starter kit I found out how expensive this has gotten. So being the really "frugal" guy I am, I went online to find some DIY alternatives.
I found some YouTube videos on rolling your own body tubes from copy paper and fins from card stock.
We built one and it flew great, and I didn't get all itchy about my 9 year old coloring an expensive model with magic markers. But now I'm hooked again on model rockets.
So I searched some more for other plans to build and found Art Applewhite and Chris Michielssen paper models and eventually JimZ and the OldModelRockets and this forum.
I started figuring out how to build the old models I remembered when I was a kid without spending a bunch of money.
I made the body tubes from scrap paper and the fins from layers of cereal box cardboard glued together and the nose cones from paper from some of the ideas I found on other sites.
So 1st I built a Mosquito,

Then some Centuri Akela 1s to launch with the Scouts,

Then I gave myself a mission to try to build every single Centuri model. Why the Centuri's? I guess because they don't exist anymore.
So first the Lil Herc

Then I stumbled across kuririn's post about the Estes DIY pack so had to reply with what I was working on today.
The Centuri Twister and the Sea Killer #5331

Now remember this long post is your own fault for letting me do it.
Have fun guys

 

Excellent build technique. This thing is practically fool proof. You could fly it on just about any motor that would fit, if you can get it back that is.

 

Finished my first rocket in approximately 40 years!

 

Thanks. Getting it back is the key phrase. I lost the first one on an H54 upper staged flight where the tracker failed and I flew anyway.

The mount looks like this:



And Ulexis - great looking Goblin.

 

Binder Design Excel 4” 38mm fin can by 802high posted Oct 5, 2019 at 6:10 PM

Binder Design Excel by 802high posted Oct 5, 2019 at 6:22 PM

Binder Design Excel 4” 38mm Fin can is out and first set of fillets is on. Building and flying this for my level 1

 

I'm getting a bunch of stl files ready to print while ordering and waiting for my resin. I'm getting some white because Centuri, some red because Centuri, some blue because Centuri, and some orange... because... Allis Chalmers!