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4" Frenzy XL
#1
Coming to a build thread near you...

[Image: attachment.php?aid=579]

Probably going to start tomorrow since I'm really exited to own a 4" model again. I just like that diameter, you can fly big I motors to big M motors with no problems. Easy to work with and get your hands into, but not too big that it's cumbersome. I'm a sucker for split fin models, so the frenzy just had to be mine.

Also, by no means is this an L3 cert rocket. I'm saving that for something even crazier. Mainly because I want to fly an N for a cert.


Attached Files Thumbnail(s)
   

NAR# 98194
Level 1: CTI I-216, 3,043'
Level 2: CTI K-740, 5,999'

Personal altitude record: 12,400' CTI L395
2014 total impulse: 9,018.2 Ns (76% M)
2015 total impulse: 7,171.7 Ns (40% M)
2016 total impulse: 18,664.2 Ns (91% N)
2017 total impulse: 8,281.1 Ns (80% M)
Reply
#2
I didn't post yesterday but I did give the parts their mandatory bath. Also started marking up the tubes and dry fitting everything to make sure everything was square.

While I didn't get everything done that I wanted to yesterday, I did also manage to cut an Av-bay sled (shown with RRC3 and battery for scale)

[Image: attachment.php?aid=597]

This thing is large enough that I can fit my RRC3 and its battery, Raven 3 and its battery, homemade power perch for the Raven (just a strip of terminal blocks), and the missile works RTX system when that becomes available. All on the same side. Maybe I have to put a camera on board...


Attached Files Thumbnail(s)
   

NAR# 98194
Level 1: CTI I-216, 3,043'
Level 2: CTI K-740, 5,999'

Personal altitude record: 12,400' CTI L395
2014 total impulse: 9,018.2 Ns (76% M)
2015 total impulse: 7,171.7 Ns (40% M)
2016 total impulse: 18,664.2 Ns (91% N)
2017 total impulse: 8,281.1 Ns (80% M)
Reply
#3
There is a true joy in working with 4" tubes and up if you are doing redundant DD.  Wink
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
#4
(10-27-2015, 03:28 PM)Bat-mite Wrote: There is a true joy in working with 4" tubes and up if you are doing redundant DD.  Wink

My first 4" rocket (also a Madcow FWFG kit), got me my L1 amd L2 certs. After I got my Raven 3 I adapted it to fit that and the RRC3. Later on I fit a camera (Flip Mino HD) to the backside of the sled. Never flew it with the camera though. And that was a 9" long Av-bay.

--------------------------------------------------------------------------------------

I finished marking up the tubes today and wrote down what size holes go where. When I got the static port sizing on the vent band, I reffered to the RRC3 users manual to get proper sizing for three evenly spaced holes. I was a little suprised to find out that the single hole sizing was smaller than the single hole that I used on a shorter Av-bay of the same diameter over a year ago. With that Av-bay I went by the kit's instructions, which could be the reason for the descrepency. However the three holes (0.166 diameter, #19 drill bit) seem way to small for this monster.

Another hole that I'm a little worried about is the vent hole for the main body tube. Not quite sure if tjeres a formula to figure it out, or if I need one there (directions called for 1/8" on payload but nothing on booster section).

I going to start drilling all the holes tonight, except for the booster section vent hole. Since holes can be made larger an not smaller, I'm going to go ahead and drill the static holes anyway.

NAR# 98194
Level 1: CTI I-216, 3,043'
Level 2: CTI K-740, 5,999'

Personal altitude record: 12,400' CTI L395
2014 total impulse: 9,018.2 Ns (76% M)
2015 total impulse: 7,171.7 Ns (40% M)
2016 total impulse: 18,664.2 Ns (91% N)
2017 total impulse: 8,281.1 Ns (80% M)
Reply
#5
Got a little more work done today. The vent band was epoxied to the coupler tube, and the av-bay bulk plates were epoxied into stepped bulk plates so they can be proper lids

Other than that, nothing else done today. I'll need to order more epoxy once I get by the av-bay.

NAR# 98194
Level 1: CTI I-216, 3,043'
Level 2: CTI K-740, 5,999'

Personal altitude record: 12,400' CTI L395
2014 total impulse: 9,018.2 Ns (76% M)
2015 total impulse: 7,171.7 Ns (40% M)
2016 total impulse: 18,664.2 Ns (91% N)
2017 total impulse: 8,281.1 Ns (80% M)
Reply
#6
While I'm away for a couple days, I decided to play around with figuring how I'm going to paint it. I'm open to ideas, but this is what I have so far:

[Image: attachment.php?aid=642]

I know that the fins have two different color patterns, thats just to entertain ideas.

Again I'm open to ideas and that does include colors. I'm really looking for something that will stand out though.


Attached Files Thumbnail(s)
   

NAR# 98194
Level 1: CTI I-216, 3,043'
Level 2: CTI K-740, 5,999'

Personal altitude record: 12,400' CTI L395
2014 total impulse: 9,018.2 Ns (76% M)
2015 total impulse: 7,171.7 Ns (40% M)
2016 total impulse: 18,664.2 Ns (91% N)
2017 total impulse: 8,281.1 Ns (80% M)
Reply
#7
(10-27-2015, 03:28 PM)Bat-mite Wrote: There is a true joy in working with 4" tubes and up if you are doing redundant DD.  Wink

Backup D/D has been a big thing for me! I use just about anything as a primary altimeter then use an AMW Pico single output accelerometer based unit for a backup of the apogee event. I figure as long as I get the apogee event the chances of killing someone drop dramatically! Also because it records at a 1,000 samples a second i get a real good idea of what my propellant is doing.


Bill Clune L3 | NAR#88583
Been a launch Director
Founded a Club
MARS Club|SRC|MDRA - Forever
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#8
(10-28-2015, 08:52 PM)T34zac Wrote: Got a little more work done today. The vent band was epoxied to the coupler tube, and the av-bay bulk plates were epoxied into stepped bulk plates so they can be proper lids

Other than that, nothing else done today. I'll need to order more epoxy once I get by the av-bay.

(10-29-2015, 11:48 PM)T34zac Wrote: While I'm away for a couple days, I decided to play around with figuring how I'm going to paint it. I'm open to ideas, but this is what I have so far:

[Image: attachment.php?aid=642]

I know that the fins have two different color patterns, thats just to entertain ideas.

Again I'm open to ideas and that does include colors. I'm really looking for something that will stand out though.

I think the right fin scheme looks nice. Will make a good looking rocket.
Bill Fields
L2
TRA
Reply
#9
(10-30-2015, 09:59 AM)Getmore Wrote: I think the right fin scheme looks nice. Will make a good looking rocket.

Thanks. I was leaning on the right fin as well. Colors I kinda like, but I'm still looking for other ideas.

As for today, I drilled some holes:

[Image: attachment.php?aid=646]

Vent band holes. #19 drill bit (0.166"). Still a little concerned about the size of them, if they need to be bigger, that can be done.

Also got the holes drilled for the rivets, but surprise, I'm ising countersunk screws instead. I never liked the plastic rivets, too flimsy. I saw the countersunk screws done somewhere before and I knew j had to do it at some point.

[Image: attachment.php?aid=647]

Next up was the shear pin holes. 2-56 shear pins were selected since I have an abundance of them, and that's what I used on my last 4" build.

[Image: attachment.php?aid=648]

And one more set of holes:

[Image: attachment.php?aid=649]

These ones got me nervous. I was drilling into a $70 nose cone, screwing up was not an option. However that would not be the case, instead I ended up with a result I am happy with. I wanted the nose cone shoulder to be removable so I could use it as a tracking bay or an av-bay for flying without the payload section.


Attached Files Thumbnail(s)
               

NAR# 98194
Level 1: CTI I-216, 3,043'
Level 2: CTI K-740, 5,999'

Personal altitude record: 12,400' CTI L395
2014 total impulse: 9,018.2 Ns (76% M)
2015 total impulse: 7,171.7 Ns (40% M)
2016 total impulse: 18,664.2 Ns (91% N)
2017 total impulse: 8,281.1 Ns (80% M)
Reply
#10
Made some more progress in the av-bay. Got the RRC3 mounted, and with it taking up so much room, I have no idea how I will fit my Raven...


[Image: attachment.php?aid=653]


Attached Files Thumbnail(s)
   

NAR# 98194
Level 1: CTI I-216, 3,043'
Level 2: CTI K-740, 5,999'

Personal altitude record: 12,400' CTI L395
2014 total impulse: 9,018.2 Ns (76% M)
2015 total impulse: 7,171.7 Ns (40% M)
2016 total impulse: 18,664.2 Ns (91% N)
2017 total impulse: 8,281.1 Ns (80% M)
Reply


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