Author Topic: 3" MAC Villain  (Read 3250 times)

Offline dbmccann

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3" MAC Villain
« on: November 22, 2015, 09:29:26 PM »
Something more recent -  Mike did an outstanding job building the parts for this kit.  I can't comment enough how well the parts fit out of the box compared to other companies. Just...awesome. 

So here we go.
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In what seems a broken record by now -  WOW.  These parts are cut perfectly.  No dust to wash off, no sanding to fit parts ...this kit is ready to go.   I opted to have the booster extended out to 30"

I'm busy with the holiday and LDRS cleanup still, but I wanted to get this open, snap a few pics and check it out. This will be a full build thread. So here we go.

Parts layout, including official LDRS mud on my table.


One of the canvas fins.  Feels nice.



ALL DONE!  OK not really...but this snapped together nicely for a dry fit.  And it's LIGHT.



and the rear end.  This will wear an aeropack, and may get foamed.



DUDE! Instructions?  cool!   Both the instructions and Data sheet are updated for my custom booster.  Nice.


I Dry fit everything in the MMT, and pushed it into the booster.  Nice and slick.  I then measured where to place the mid ring.  Pulled everything out and placed the ring, marked under it with a sharpie.    The Mid CR was then pulled under this line, and a ring of rocketpoxy placed around the line.   The Mid CR was pushed up past the epoxy line, filleting itself in place.   Care was taken that no epoxy remained under the mid ring, as it would interfere with the fit of the fins.





The same process was repeated with the top ring, omitting the line as it's position is not critical.  It was also filleted on the bottom side, and the recovery harness mount covered in epoxy as well.




Offline dbmccann

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Re: 3" MAC Villain
« Reply #1 on: November 22, 2015, 09:30:30 PM »
First up tonight, tool preparation.   I marked my finely tuned epoxy application device (wood dowel) so I wouldn't apply any epoxy past where the MMT will reside.   I aim to apply a ring right past the fin slots and a little beyond.  If you apply it fairly thin, you'll get a nice top ring fillet to the BT, and good adhesion and seal for the mid ring still.    I also taped a bit of sand paper to the top of a one inch wood dowel. 



I used my handy sanding stick to sand the slots and around in the tube.  Nothing major, I just want it a bit rougher.  Then I ran a towel down it a few times to clean out the major dust. a little acetone isn't a bad idea.   


Time for glue.  I glob some on my stick, and make sure it's not dripping off after rolling it around some.   Push the stick in carefully not dropping any, then spread around the inside just above the slots.




The motor mount tube is then set on the bench vertically, and the booster pushed down over it.    These photos show the top ring fillet, and that I have had the recovery harness sticking out the rear this whole time to keep it free of epoxy.   After checking the top fillet and the spacing of the mid ring, and rear CR and aeropack, I pushed the harness through the motor mount and out the top end of the booster.  I weighted it with a spare wrench, to prevent it from getting epoxied in a kinked position.




Next up, Fin Tacking!

Not exactly a huge step here, just something I forgot to do earlier.  I pulled off the aeropack and rear ring.   Then the coupler was slid into the rear oft he booster.  I dropped a Popsicle stick in to make sure it didn't bury itself.  You could also just leave an inch or two hanging out the back in retrospect.   I drew three lines on the coupler using the slots as guides.  Flipped the coupler and extended the lines all the way.   Nice and simple, makes thing easier later.  Another great trick learned someplace here on TRF.



Fins were lightly, lightly sanded.  I want it rough, but not to mess up the tight fit.  I don't intend to put the fins in any jig.


So, light is useful.   How? well let's see.    I took a small flashlight and laid it on my bench.  Holding the booster up to it, the light passes through the slots and onto the motor tube.  This gives a good approximation of where the fin will go.    I mixed up a batch of Rocketpoxy, and grabbed a bamboo skewer.  Rolling about 2" ofthe flat end in the epoxy, a good amount of epoxy is on the stick without being too thick a ball.   You want a roll of it, not a glop.    you need a STEADY hand to get it down into the tube without hitting the sides.  Remember playing operation?    If you get any on the sides where the rear CR will go,  wipe it off.   Anywhere else is mostly safe just annoying.  I laid a nice thin tack under the slots,  doing one entire fin at a time before moving to the next slot.    (after this photo I added a bit more)



Typical buttering of the fins. The rear of the fin was placed in the slot, pushed to the rear and then the fin snapped into the slot.   It was then pushed to the front of the slot.  Excess on the exterior was cleaned up, though with fillets coming not really critical.  Hard to see in the slot, harder to get a photo.  But there is a nice bead of glue under each fin on both sides now.




Now that all the fins are in, I bust out my handy fin guide from payload bay.  (what? Dave you're totally doing that wrong!!!)


Once you get the booster placed and centered on the guide,  grab your light again.   If you wave it past the fins slowly, you will see a point when the shadow is directly under the fin.   If all these shadows line up with the lines,  you're set kids! 



On my screech I used a similar method. I did one fin at a time on that.  If a fin was slightly off, I braced it in place with a can of epoxy against the offending side of the fin.   The video on that rocket shows less spin than any other I've watched, so it seems to work.

Offline dbmccann

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Re: 3" MAC Villain
« Reply #2 on: November 22, 2015, 09:31:09 PM »
Some quick internals.   Never foamed a can.... going with what I know.     Rocketpoxy on skewers, fillets on the fins to body tube.   I tried to get photos.  basically useless.   But those fins are IN there.   After that, I pulled the tape and put glue in for the rear CR.   Slapped that puppy on there and pressed it tight.   Well, still got glue.... may as well get that aeropack on there....
Aaaaaannnnnnddddd I got bit.... Well, he does warn you... those things ARE sharp.  It's ok....blood lowers Cd :)






mmmm  buttoned up booster....aaahhhhhh..... I love this stage.....


Offline dbmccann

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Re: 3" MAC Villain
« Reply #3 on: November 22, 2015, 09:35:10 PM »
Hey look! the kid's working again!    My toddles are sleeping so I laid some glue.

I love doing lines....




I tried using a tongue depressor to pull the fillets.  FAIL.  3/4" pipe for the win.

these are kinda messy.  first time with rocketpoxy.   they'll sand out.





yea these are iPhone shots..... we'll get back to the Canon 7D soon enough....

OK time to clean those up a bit.  I used undyed rocketpoxy for contrast.   The backs were a bit thin when I pulled them out,  and I wanted to fill that in.  I'll sand them down a bit to clean up the rear edges.



Set #2




I know... fillet photos are the worst.   But here's set three.   Here's about the point I realize I need to build the av-bay.   And I HATE building them.   
Plan at the moment is to get my MARSA 54L in there with a screw switch.  I may mount an RRC3 in there as well.  Not entirely decided yet. 

The nosecone I plan to do something I've never done.   I need to grab a pair of wood 3" to 54mm CR's and stuff them in the shoulder, then epoxy a 54mm tube in there, and make a bulkhead for that tube somehow to enclose the tracker.   At least that's the plan.



I haven't died.... just been busy, as is usual. 




Mike even ground the end of the all thread.  That's pretty cool.



OK, back to work.

Remember those lines on the coupler, here we go, 3 vent holes nice and easy....



RRC3, BRB900, screw switch.   not pretty but it'll work.




Well, I couldn't fly it naked.... so I got some primer on, and looked at what I had around.  Was going to try a green florescent payload and nose... Can didn't work anymore.  Toss that one.   Found a can of Testors Lime Ice.  Ran out half way around the payload.  toss that.   OK, duplicolor black.  halfway around again, but...this time I found another can of it and finished off the payload and nose.   The booster... I had a can of Flo Yellow.  This could look cool.   Nope.  Looks terrible, but it's color on there.  I accidently came into this color combo, and I kind of like it.   The booster will be getting sanded down and repainted ASAP.   I couldn't even stomach taking a real photo of it.



YEA!



« Last Edit: November 22, 2015, 09:39:45 PM by dbmccann »

Offline dbmccann

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Re: 3" MAC Villain
« Reply #4 on: December 05, 2015, 08:54:31 PM »
Starting the nose bay

Offline RKeller

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Re: 3" MAC Villain
« Reply #5 on: December 05, 2015, 11:14:29 PM »
that is slick! talk about a time saver for a tracker bay!
Riley Keller
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TRA#15415
L1 25 Oct 2014 Estes MDRM CTI H133
L2 25 June 2015 Rocketry Warehouse DYOK, CTI L1030RL 14.7k ft mach 1.57

I'm addicted to building stuff, rockets are just a way to get high

Offline dbmccann

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Re: 3" MAC Villain
« Reply #6 on: December 06, 2015, 04:51:01 PM »
Not my cleanest epoxy application, but not my worst.    Tube assembly is all glued up and curing, and the upper CR is glued into the NC and curing.    Once these two set up,  I'll epoxy the tube to the upper CR, and at the same time the lower CR to the nosecone.   



Offline dbmccann

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Re: 3" MAC Villain
« Reply #7 on: December 09, 2015, 11:44:20 PM »
Got back to it tonight.   I put a fat bead of epoxy around the top of the payload tube:



Then, my phone died.  So no more photos.    But I then covered the inside bottom of the NC with epoxy as well.   I then carefully inserted the tube into the forward centering ring, and slowly pushed down on the nosecone until the rear stepped ring seated in the nosecone.    Checked for epoxy leaks, and set aside to cure.

Offline RKeller

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Re: 3" MAC Villain
« Reply #8 on: December 10, 2015, 12:28:41 PM »
David Mccann can't take pictures because his phone is dead ???
Riley Keller
URRG
TRA#15415
L1 25 Oct 2014 Estes MDRM CTI H133
L2 25 June 2015 Rocketry Warehouse DYOK, CTI L1030RL 14.7k ft mach 1.57

I'm addicted to building stuff, rockets are just a way to get high

Offline dbmccann

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Re: 3" MAC Villain
« Reply #9 on: December 10, 2015, 01:45:11 PM »
Yea yea.   Dude.... It was like, alllllllllll the way over there.....

Offline Shearpin

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Re: 3" MAC Villain
« Reply #10 on: December 16, 2015, 07:27:15 PM »
got a custom Scorpion from Mike for a Christmas present for my boy Dean, wants to get his Jr L1 and L2 next year. Mike changed out the MM to 54 and stretched the booster 14" and the payload 2". Great stuff he sells!

Offline dbmccann

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Re: 3" MAC Villain
« Reply #11 on: August 01, 2016, 12:25:15 PM »
Forgot to add flight photos and info to this...



Some GPS-


And data.  first flight was on an RRC3 and a J820.   next two are with a MARSA 54L, a Patell 3 grain 54mm, and a Loki J820LW





« Last Edit: August 01, 2016, 12:27:25 PM by dbmccann »