Q about LOC Bruiser EXP

Q about LOC Bruiser EXP

Post by Bob Chmar » Mon, 22 Feb 1999 04:00:00



I plan on using this as an L2 rocket.
- Any building tips?
- Any recommended mods?
- According to the instructions, the two outer motor tubes are epoxied to
the main motor tube.  Will the aft closures on Aerotech casings interfere
with each other?  (I don't plan on using the outer motors for a cert flight,
but I'll certainly want fly it with a cluster at a later time.)

Thanks,
Bob Chmara
NAR HUVARS TRA Team1 L1 (additional letters added as acquired)
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Q about LOC Bruiser EXP

Post by Jackbear » Mon, 22 Feb 1999 04:00:00


I did my L2 cert on a LOC Magnum and now have a Bruiser EXP under construction.
Experience so far:
IMHO, YMMV, many people disagree with me, the magnum 5/16 bungee shock cord is
substantial.  It held together on a later flight with a late-igniting H97 still
burning at ejection of the drogue chute.  The Bruiser EXP came with a 2" wide
piece of elastic, about 20' long, which I consider inadequate.  The Bruiser EXP
also comes with two chutes which adds complexity. I will be using a much
heavier shock cord in the Bruiser. Be sure to think through and follow the
assembly sequence on the tube within tube assembly carefully to ensure you can
get all the glue fillets where you need them. When gluing the motor tubes
together, it says use "light" epoxy. They mean it- the centering rings have to
slide up and down the tube assembly and a heavy fillet at this point will force
you to cut away part of the centering rings.   Other than this caution the
Bruiser is straightforward. I would go with a magnum for L2 cert, then build
the Bruiser, if I were you. DO NOT FORGET TO PLUG THE 38mm TUBES WHEN FLYING A
SINGLE MOTOR.
Jack W. Kale, Jr. NAR #70384 Insured, Tripoli #5798 Level 2 March 16, 1998

Timmy, you can't take it with you, so if you have a sandwich and your blue
jeans, chill. Your old man, Paul. (1st century, paraphrased)

 
 
 

Q about LOC Bruiser EXP

Post by Jackbear » Mon, 22 Feb 1999 04:00:00


Second response, additional information- I am converting the payload bay to
hold dual altimeters, and a staging timer, and two stage deployment- drogue
from the main airframe,  main chute from the payload bay.  I also ran a pair of
wires the length of the main body for use of electronic staging to control the
side motors. Otherwise you will have to use thermalite.  If you ever want to
fly this thing on a full K, you will need two altimeters since the full K has a
plugged closure.
Jack W. Kale, Jr. NAR #70384 Insured, Tripoli #5798 Level 2 March 16, 1998

Timmy, you can't take it with you, so if you have a sandwich and your blue
jeans, chill. Your old man, Paul. (1st century, paraphrased)

 
 
 

Q about LOC Bruiser EXP

Post by Jackbear » Mon, 22 Feb 1999 04:00:00


Third response- I also have fully glassed the airframe with 2 wraps of 5oz
fiberglass with an eye to eventually flying this thing on a full K plus 2 38mm
J's.
Jack W. Kale, Jr. NAR #70384 Insured, Tripoli #5798 Level 2 March 16, 1998

Timmy, you can't take it with you, so if you have a sandwich and your blue
jeans, chill. Your old man, Paul. (1st century, paraphrased)

 
 
 

Q about LOC Bruiser EXP

Post by Tom Binfor » Mon, 22 Feb 1999 04:00:00


Quote:

> I plan on using this as an L2 rocket.
> - Any building tips?
> - Any recommended mods?
> - According to the instructions, the two outer motor tubes are epoxied to
> the main motor tube.  Will the aft closures on Aerotech casings interfere
> with each other?  (I don't plan on using the outer motors for a cert flight,
> but I'll certainly want fly it with a cluster at a later time.)

Replace the shock cord with tubular nylon.
The outboards, if all reloads, will just miss. Add positive retension
for the motors, there's not enough room to tape them.
If flying single motor, cover the outboard holes. The exhaust from a
large central motor will recirculate around the base and will burn out
the outboard tubes if open. A K250 completely destroyed the outboard
tubes on my Magnum when I flew it with the outboards uncovered.
Tom
 
 
 

Q about LOC Bruiser EXP

Post by Bob Chmar » Mon, 22 Feb 1999 04:00:00


Tom:

Thanks for the info, but if you wouldn't mind, I could use a little
clarification.  By "The outboards, if all reloads, will just miss" do you
mean that they'll all fit or they won't fit?

Thanks,
Bob Chmara
NAR HUVARS TRA Team1 L1 (additional letters added as acquired)
(remove SPAMFREE for personal replies)

 
 
 

Q about LOC Bruiser EXP

Post by Bob Chmar » Mon, 22 Feb 1999 04:00:00


Jack, all good info, I think I'll take your advice on wiring the airframe.

Thanks,
Bob Chmara
NAR HUVARS TRA Team1 L1 (additional letters added as acquired)
(remove SPAMFREE for personal replies)

 
 
 

Q about LOC Bruiser EXP

Post by Tom Binfor » Mon, 22 Feb 1999 04:00:00


Quote:

> Tom:

> Thanks for the info, but if you wouldn't mind, I could use a little
> clarification.  By "The outboards, if all reloads, will just miss" do you
> mean that they'll all fit or they won't fit?

> Thanks,
> Bob Chmara
> NAR HUVARS TRA Team1 L1 (additional letters added as acquired)
> (remove SPAMFREE for personal replies)

If all the motors are reloads, the aft closures just about touch when
the motors are installed. They will fit though.
Tom
 
 
 

Q about LOC Bruiser EXP

Post by John W. Herbold J » Tue, 23 Feb 1999 04:00:00


Bob,

    I used the LOC Bruiser EXP 3  and flew it for my cert II
on a K1100.  I made several mods to the kit.

1) Wraped the body in Kevlar.

2) Used Carbon Fiber Tape on the Fin roots.

3)  Added 4 Outer 38mm motor tubes.

I have not had the chance to fly it again but will, but a
testfit on the 38's had no problems.

John