Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > Semroc > SAM - Semroc Astronautic Modeler Team
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #31  
Old 04-16-2013, 03:30 PM
Doug Sams's Avatar
Doug Sams Doug Sams is offline
Old Far...er...Rocketeer
 
Join Date: Mar 2005
Location: Plano, TX resident since 1998.
Posts: 3,966
Default

Quote:
Originally Posted by stefanj
I'm flat out of A6-4s. I've used that motor in the past for upper-stages and it works fine for that.

I have plenty of A8-5s, but the Maxi-Micron is so bulky I think I could get away the A8-3.
My first thought was that the A8-3 delay was too short. But when I looked at the specs, 1.84" diameter, I decided the 3 sec delay was probably OK.

Doug

.
__________________
YORF member #11
Reply With Quote
  #32  
Old 04-16-2013, 03:37 PM
Doug Sams's Avatar
Doug Sams Doug Sams is offline
Old Far...er...Rocketeer
 
Join Date: Mar 2005
Location: Plano, TX resident since 1998.
Posts: 3,966
Default

Quote:
Originally Posted by ghrocketman
I look at it this way....You would not fly it on a B6-2, B4-2, or C6-3 right ?
This thing is 1.84" in diameter. My Big Bertha, 1.64" dia, flies just fine on B4-2's and C6-3's...


Quote:
While a B6-0 to A8-3 may work, I think a B6-0 to A8-5 would probably be better. I think the 3 second delay would be far too short and most likely it will still be moving upward at a pretty good pace. May shred a chute.
That was my first thought, too, but when I considered the size of the rocket, I figured the long delay was probably not as good a fit as the A8-3. (Altho the A6-4 crossed my mind.)

...

My second thought was that this thing was begging for 24mm motors

Doug

.
__________________
YORF member #11
Reply With Quote
  #33  
Old 04-16-2013, 03:45 PM
Carl@Semroc's Avatar
Carl@Semroc Carl@Semroc is offline
Junior ??? Rocketeer
 
Join Date: Mar 2005
Location: Knightdale, NC
Posts: 1,470
Default

According to Rocksim, B6-0/A8-3 works well.

383 ft
5.0 sec to apogee
16.7 ft/sec Vd
3.41 sec optimal delay

Maxi-Micron-Booster-18
__________________
Carl McLawhorn
NAR#4717 L2
semroc.com
Reply With Quote
  #34  
Old 04-16-2013, 06:02 PM
BEC's Avatar
BEC BEC is offline
Master Modeler
 
Join Date: Feb 2009
Location: Auburn, Washington
Posts: 2,702
Default

Unfortunately Estes A8-3s tend to run a little short of 3 seconds.....the NAR cert data says 2.25s. But so do Quest A6-4s - at 3.52s (for the Chinese motors). So the A6-4 sounds right (though it's thrust curve will yield a lower altitude flight).
__________________
Bernard Cawley
NAR 89040 L1 - Life Member
SAM 0061
AMA 42160
KG7AIE
Reply With Quote
  #35  
Old 04-18-2013, 02:24 PM
Initiator001's Avatar
Initiator001 Initiator001 is offline
Too Many Initiators is Never Enough
 
Join Date: Mar 2005
Location: San Diego, CA
Posts: 2,045
Default

Quote:
Originally Posted by ghrocketman
Looks GREAT !
Have you looked into building a 1972-version Enerjet Aero Dart clone to complement this one ?


He should build an Aero-Dart family like I did.

Ooops! I still need to build the Semroc Mini Aero-Dart I picked up at NARAM-52.
Attached Thumbnails
Click image for larger version

Name:  Aero-Darts.jpg
Views: 31
Size:  198.8 KB  
__________________
Bob
S.A.M. # 0014
Reply With Quote
  #36  
Old 04-18-2013, 06:03 PM
stefanj stefanj is offline
Master Modeler
 
Join Date: Mar 2005
Location: Hillsboro, OR
Posts: 2,626
Default

The little nozzle-shaped booster pod is very clever. I was thinking "maybe I should punch vent holes in it" when I realized that the motor mount design did that already.

I may do something like that on my Lil' Beth X-2 upscale. The tolerances on the wooden slats will have to be pretty tight, but it would look better than punching holes in the booster.


* * *
Can anyone suggest a width for the black band on the top of the Maxi-Micron body tube? That is: The nose cone is black, but it looks like the top of the body tube is as well.
__________________
NAR #27085 - Oregon Rocketry - SAM
Reply With Quote
  #37  
Old 04-18-2013, 06:58 PM
Carl@Semroc's Avatar
Carl@Semroc Carl@Semroc is offline
Junior ??? Rocketeer
 
Join Date: Mar 2005
Location: Knightdale, NC
Posts: 1,470
Default

Quote:
Originally Posted by stefanj
Can anyone suggest a width for the black band on the top of the Maxi-Micron body tube? That is: The nose cone is black, but it looks like the top of the body tube is as well.

The model in the photo has a 3.25" black band at the top of the tube.
__________________
Carl McLawhorn
NAR#4717 L2
semroc.com
Reply With Quote
  #38  
Old 04-18-2013, 08:48 PM
stefanj stefanj is offline
Master Modeler
 
Join Date: Mar 2005
Location: Hillsboro, OR
Posts: 2,626
Default

Quote:
Originally Posted by Carl@Semroc
The model in the photo has a 3.25" black band at the top of the tube.

Perfect, thanks!

I am going to need to build a spray booth; my new back yard is tiny, and I don't want to overspray my neighbors' fences and patio furniture.
__________________
NAR #27085 - Oregon Rocketry - SAM
Reply With Quote
  #39  
Old 04-18-2013, 10:23 PM
BEC's Avatar
BEC BEC is offline
Master Modeler
 
Join Date: Feb 2009
Location: Auburn, Washington
Posts: 2,702
Default

Quote:
Originally Posted by Initiator001
He should build an Aero-Dart family like I did.

Ooops! I still need to build the Semroc Mini Aero-Dart I picked up at NARAM-52.


I have one of those with one coat of balsa fillercoat on it.....

Not sure I'll be trying to do an Aero Dart family beyond that, but I did also just finish a mount for the 29mm Estes BP Es and Fs so I can fly the one in the picture on those motors at NSL, hopefully..... Its first two flights on an Estes D12 and E12 were sure nice.

Oh - and back on topic - got the second order from Carl and Sheryl and company with the Maxi Micron and Booster-18 in it. With a little luck I'll bring those to NSL as well.

I now have Centurion F number 00008 and 00026. I'll build the second one I think.
__________________
Bernard Cawley
NAR 89040 L1 - Life Member
SAM 0061
AMA 42160
KG7AIE
Reply With Quote
  #40  
Old 04-19-2013, 10:57 PM
Neal Miller Neal Miller is offline
Master Blaster
 
Join Date: Aug 2011
Location: South Florida
Posts: 257
Default New SEMROC Kits

My Maxi Micron was delivered yesterday, looks to be similar in size to the SLS Explorer.
When I build the MM, I will go to my box of old parts and use some Flight Systems centering
rings, modify them to fit a 24mm tube. and fly this kit on C11's and D12'S.
I think I will leave the 18mm tube out of the Booster as well.
I don't know what 24mm motors will do to the CP -CG, I will compensate
with washers as needed.
The Maxi Micron / Booster 18 flying on a C11-0/ C11-7 -D12-0 / D12-7will be exciting.
SEMROC has some of the most interesting kits on the market today.
__________________
Neal Miller
Master Blaster NAR# 58296
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -5. The time now is 07:48 PM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe 1998-2020