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Thunder Struck L3 Build
#11
Got the Green light from my L3CC at the launch over the weekend! Just have to take pictures and tweak the rocksim file as I go (actual weights of some of the parts I don't have yet like the coupler and switch band, and then the adhesives)
So now the epoxy will start flowing!
Dave Greger L3
NAR# 95846
MDRA #65

Hollie L1
NAR# 99687
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#12
Dave,

Great flight for you this past wkend at MDRA.

From your rockesim data the cone is 33" and nose weight may not be needed.
To have the cone..with it's own chute attached... separate when the main charge fires allows for less chance of tangling. It increases the number of rocket pieces to recover.
If there was to be significant nose weight added...not the case here...the cone separating let's you use a smaller sized main chute.
Tom Cohen

MDRA...Maryland
MARS...Geneseo N.Y.
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#13
Tom,
I've thought about doing that only without adding nose weight, right now rocksim has it well over stable because of how tall it is. I'm sure it will even out once its all glued up. I will post the file when I get home this evening.

Here's the sim file. with the 2 Grain M1560 it's still 4.70 overstable.


.rkt   L3 98mm.rkt (Size: 64.14 KB / Downloads: 7)
Dave Greger L3
NAR# 95846
MDRA #65

Hollie L1
NAR# 99687
Reply
#14
Slow moving on this one as it is getting colder here and dumba$$ me left my portable heater in the trailer! (Its parked at my parents house about ten minutes away, gonna pick it up this afternoon)
Plans for this evening are to
1st. Mix up some JB Weld to repair a hole in the garbage diposal! Damn thin started leaking last night.
2nd. Wash all the FG parts
3rd. Sand the NC coupler so if fits better in the NC. I am making it removable and its way too snug right now.
4th. Already printed out the fin template, using that to mark the booster for slots
5th. Mark booster for Rail Guides.
6th. Dry Assemble CRs on Motor tube with threaded rods and mark locations. Would like to at least get the forward CR epoxied on the MMT.
Dave Greger L3
NAR# 95846
MDRA #65

Hollie L1
NAR# 99687
Reply
#15
Subscribed!

And, you must be a homebrewer as well given your "take me to the bar" metal sign??
Mark Rose
Tripoli Vegas
TRA #11717 L3
KG7NWI
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#16
Mark, nope not a home brewer! lol the sign actually says "Welcome to the Bar" I got that one and a handful of other ones from my grandfathers basement when he passed away back in '05. I just don't have a "Bar" to hang them in......Yet!


Progress made yesterday:
1. Sanded the Nose Cone coupler so it is easier to insert and remove since it will be removable.
2. Laid out the lines on the booster for the fins and rail guides.
     Can't decide on 1515 or Uni-Strut Buttons......Suggestions? The rocket is going to top out at 11ft and around 45lbs with motor.
Dave Greger L3
NAR# 95846
MDRA #65

Hollie L1
NAR# 99687
Reply
#17
I am not familiar enough with the away pads at Higgs .... Are the trusses unistrut and the two regular pads 1515?
John S.
NAR #96911
TRA #15253
MDRA
Level 1, 2014-Mar-15 -- Aerotech Sumo, H133BS
Level 2, 2014-Jun-21 -- Giant Leap Vertical Assault, J240RL
Level 3, 2016-03-12 -- MAC Performance Radial Flyer, M1101WH, 13,028 feet
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#18
The trailers are unistrut, that I know. And at least two of the pads are 1515, they are much larger than the B or C rack pads.
Dave Greger L3
NAR# 95846
MDRA #65

Hollie L1
NAR# 99687
Reply
#19
Yeah, that's what I thought.
John S.
NAR #96911
TRA #15253
MDRA
Level 1, 2014-Mar-15 -- Aerotech Sumo, H133BS
Level 2, 2014-Jun-21 -- Giant Leap Vertical Assault, J240RL
Level 3, 2016-03-12 -- MAC Performance Radial Flyer, M1101WH, 13,028 feet
Reply
#20
   
Cut the MMT down 8" to 28" allowing more room in the booster for drogue/recovery gear

   
Sanded the NC Coupler to make it easier to remove. Will be held in by 4 threaded inserts and countersunk machine screws.
Also I will be running a length of 1/4-20 threaded rod from the NC tip to the Bulkhead.

   
Using the Fin template as a guide I mocked up the MMT with the Thrust Plate (Did not cut the all thread until its ready for final assembly). Of course once built, there will be nuts and washers on both sides of each Centering Ring using Loc-Tite Thread Locker.
Dave Greger L3
NAR# 95846
MDRA #65

Hollie L1
NAR# 99687
Reply


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