Engine block ideas for LOC Graduator

Engine block ideas for LOC Graduator

Post by SteveTheBA » Tue, 16 Jan 2001 09:32:21



Newbie Question:

After my son and I flew his Super Big Bertha on an AeroTech E engine and
were suitably impressed, we felt we had to try a high power rocket.
Based on discussions I've seen here we chose the LOC Graduator. Now I
knew I'd have to supply some form of retention scheme such as the Kaplow
clips, but it didn't occur to me until I read the instructions that I
also needed to supply an engine block.

I plan to use F and G engines so I assume I mark off the appropriate
distance on the 29 mm tube and epoxy in some sort of ring. One idea I
had was to cut a section of the tube the LOC kit supplies to adapt to 24
mm engines. Any other ideas?

P.S. Thanks in advance and I apologize if this question has been asked
10,000 times already.

Sent via Deja.com
http://www.deja.com/

 
 
 

Engine block ideas for LOC Graduator

Post by Gary Wolsk » Tue, 16 Jan 2001 10:44:53


I like to use 1/8" 3M masking tape used for paint trim. I use multiple layer
wraps and haven't had it fail yet.

Good flying and safe returns.


Quote:
> Newbie Question:

> After my son and I flew his Super Big Bertha on an AeroTech E engine and
> were suitably impressed, we felt we had to try a high power rocket.
> Based on discussions I've seen here we chose the LOC Graduator. Now I
> knew I'd have to supply some form of retention scheme such as the Kaplow
> clips, but it didn't occur to me until I read the instructions that I
> also needed to supply an engine block.

> I plan to use F and G engines so I assume I mark off the appropriate
> distance on the 29 mm tube and epoxy in some sort of ring. One idea I
> had was to cut a section of the tube the LOC kit supplies to adapt to 24
> mm engines. Any other ideas?

> P.S. Thanks in advance and I apologize if this question has been asked
> 10,000 times already.

> Sent via Deja.com
> http://www.deja.com/


 
 
 

Engine block ideas for LOC Graduator

Post by Robert Iannucc » Tue, 16 Jan 2001 10:47:33


NO!

That would be bad unless you want to restrict yourself to a certain motor.
The closure on the aft of the RMS casings act as a Thrust ring and will keep
the motor in place during thrust. The motor retention clips are there to
keep the motor from coming out when the ejection charge is fired. As for
single use motors you can use a bunch of wraps of masking tape to make a
thrust ring on the aft end of the motor then use motor or friction
retention.

Hope this helps.

--
Robert Iannucci
NAR 75375 Sr L2
Charter President
Eastern Arizona Rocket Society ( E.A.R.S. )

Quote:

> Organization: Deja.com
> Newsgroups: rec.models.rockets
> Date: Mon, 15 Jan 2001 00:32:21 GMT
> Subject: Engine block ideas for LOC Graduator

> Newbie Question:

> After my son and I flew his Super Big Bertha on an AeroTech E engine and
> were suitably impressed, we felt we had to try a high power rocket.
> Based on discussions I've seen here we chose the LOC Graduator. Now I
> knew I'd have to supply some form of retention scheme such as the Kaplow
> clips, but it didn't occur to me until I read the instructions that I
> also needed to supply an engine block.

> I plan to use F and G engines so I assume I mark off the appropriate
> distance on the 29 mm tube and epoxy in some sort of ring. One idea I
> had was to cut a section of the tube the LOC kit supplies to adapt to 24
> mm engines. Any other ideas?

> P.S. Thanks in advance and I apologize if this question has been asked
> 10,000 times already.

> Sent via Deja.com
> http://www.deja.com/

 
 
 

Engine block ideas for LOC Graduator

Post by Bob Kapl » Tue, 16 Jan 2001 11:08:36


Quote:

> I plan to use F and G engines so I assume I mark off the appropriate
> distance on the 29 mm tube and epoxy in some sort of ring. One idea I
> had was to cut a section of the tube the LOC kit supplies to adapt to 24
> mm engines. Any other ideas?

LMR / HPR kits don't include a motor block because the model is capable of
being flown with MANY different motor lengths. The reloads have a rear
closure that performs that function. For expendable motors, just wrap a ring
of tape around the rear of the motor. 1/4" wide masking tape is more than
sufficient for E-F-G motors.

And, yes, this question is asked all the time...

        Bob Kaplow      NAR # 18L       TRA # "Ctrl-Alt-Del"

Kaplow Klips & Baffle:      http://www.nira.chicago.il.us/Leading_Edge/MayJun00.pdf
NIRA:   http://www.nira.chicago.il.us  NAR:    http://www.nar.org





 
 
 

Engine block ideas for LOC Graduator

Post by Tim Hansfor » Tue, 16 Jan 2001 11:39:35


only thing wrong with adding a trust ring in the motor tube is that you will
be limmited to that distance for a motor, and if you make it long enuff to
hold a long motor, then you have to come up with a way to take up the space
un used in the motor, tube.  The best way is with tape around the aft end of
the motor to the dia. of the motor tube, this will be more then adiquate.
Just don't fly it on a F12, crash and burn....  big time.
                                                                  Tim


Quote:
> Newbie Question:

> After my son and I flew his Super Big Bertha on an AeroTech E engine and
> were suitably impressed, we felt we had to try a high power rocket.
> Based on discussions I've seen here we chose the LOC Graduator. Now I
> knew I'd have to supply some form of retention scheme such as the Kaplow
> clips, but it didn't occur to me until I read the instructions that I
> also needed to supply an engine block.

> I plan to use F and G engines so I assume I mark off the appropriate
> distance on the 29 mm tube and epoxy in some sort of ring. One idea I
> had was to cut a section of the tube the LOC kit supplies to adapt to 24
> mm engines. Any other ideas?

> P.S. Thanks in advance and I apologize if this question has been asked
> 10,000 times already.

> Sent via Deja.com
> http://www.deja.com/

 
 
 

Engine block ideas for LOC Graduator

Post by Jim Yan » Wed, 17 Jan 2001 06:27:09




Quote:


>> I plan to use F and G engines so I assume I mark off the appropriate
>> distance on the 29 mm tube and epoxy in some sort of ring. One idea I
>> had was to cut a section of the tube the LOC kit supplies to adapt to
>> 24 mm engines. Any other ideas?

>LMR / HPR kits don't include a motor block because the model is capable
>of being flown with MANY different motor lengths. The reloads have a
>rear closure that performs that function. For expendable motors, just
>wrap a ring of tape around the rear of the motor. 1/4" wide masking tape
>is more than sufficient for E-F-G motors.

>And, yes, this question is asked all the time...

>     Bob Kaplow     NAR # 18L     TRA # "Ctrl-Alt-Del"

>Kaplow Klips & Baffle:    
>http://www.nira.chicago.il.us/Leading_Edge/MayJun00.pdf NIRA:    
>http://www.nira.chicago.il.us     NAR:     http://www.nar.org







I'm surprised someone has not machined a split collar with a setscrew to
use as a re-useable thrust ring. One for each size motor family.Like the  
woodworkers use for depth stop collars on their drill bits.If metal,knurl
the inside for good grip.

Jim Yanik,NRA member

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Engine block ideas for LOC Graduator

Post by Tim Hansfor » Thu, 18 Jan 2001 05:55:27


It's funny you should say that, I've got two more that I'm building in my
machine shop, I've got a 24 and a 29mm they work great with the inside
nuraled, haven't had a problem yet.  Oh ya they are alum.
Tim
 
 
 

Engine block ideas for LOC Graduator

Post by Jim Yan » Thu, 18 Jan 2001 06:59:24




Quote:
>It's funny you should say that, I've got two more that I'm building in my
>machine shop, I've got a 24 and a 29mm they work great with the inside
>nuraled, haven't had a problem yet.  Oh ya they are alum.
>Tim

I would imagine that there might be a small market for them,those who
prefer to use single-use motors.

Jim Yanik,NRA member

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Engine block ideas for LOC Graduator

Post by Andy E » Fri, 19 Jan 2001 05:52:59


Hello Tim,



Quote:
>It's funny you should say that, I've got two more that I'm building in my
>machine shop, I've got a 24 and a 29mm they work great with the inside
>nuraled, haven't had a problem yet.  Oh ya they are alum.
>Tim

How much motor tube is needed for a good retention grip?

Sounds interesting.

Andy

 
 
 

Engine block ideas for LOC Graduator

Post by Jim Yan » Fri, 19 Jan 2001 09:34:52



Quote:
>Hello Tim,



>>It's funny you should say that, I've got two more that I'm building in my
>>machine shop, I've got a 24 and a 29mm they work great with the inside
>>nuraled, haven't had a problem yet.  Oh ya they are alum.
>>Tim

>How much motor tube is needed for a good retention grip?

>Sounds interesting.

>Andy

If lightly knurled on the inside,I'd think that .375" would be sufficient.

Jim Yanik,NRA member

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-----==  Over 80,000 Newsgroups - 16 Different Servers! =-----

 
 
 

Engine block ideas for LOC Graduator

Post by Gary Wolsk » Fri, 19 Jan 2001 10:21:00


oh oh forgot to mention you wrap this tape on the rear of the Engine.


Quote:
> I like to use 1/8" 3M masking tape used for paint trim. I use multiple
layer
> wraps and haven't had it fail yet.

> Good flying and safe returns.



> > Newbie Question:

> > After my son and I flew his Super Big Bertha on an AeroTech E engine and
> > were suitably impressed, we felt we had to try a high power rocket.
> > Based on discussions I've seen here we chose the LOC Graduator. Now I
> > knew I'd have to supply some form of retention scheme such as the Kaplow
> > clips, but it didn't occur to me until I read the instructions that I
> > also needed to supply an engine block.

> > I plan to use F and G engines so I assume I mark off the appropriate
> > distance on the 29 mm tube and epoxy in some sort of ring. One idea I
> > had was to cut a section of the tube the LOC kit supplies to adapt to 24
> > mm engines. Any other ideas?

> > P.S. Thanks in advance and I apologize if this question has been asked
> > 10,000 times already.

> > Sent via Deja.com
> > http://www.deja.com/

 
 
 

Engine block ideas for LOC Graduator

Post by Tim Hansfor » Fri, 19 Jan 2001 13:26:11


if your asking the with of the alum. thrust ring it's .20" as min. as pos. I
didn't make this the motor retainer for the reason of I use RMS too, and
already have clips to hold them in, so the thrust ring holds the SU motor
from going forward during thrust and the clips hold it from moving back
during ejection.  I suppose I could build one that would be be a thrust ring
and a retainer, just step it down on the inside dia. and then spit it a bit
around the middle on the out side with two fastn'rs, one to clamp the motor,
one to clamp the motor tube.  I would build it with equal with's of .20"
with probly a .03" gap between for contraction.  I'll play with it a bit an
post a note when I have time to build it.  Soo many projects.

Tim

Quote:
> Hello Tim,



> >It's funny you should say that, I've got two more that I'm building in my
> >machine shop, I've got a 24 and a 29mm they work great with the inside
> >nuraled, haven't had a problem yet.  Oh ya they are alum.
> >Tim

> How much motor tube is needed for a good retention grip?

> Sounds interesting.

> Andy

 
 
 

Engine block ideas for LOC Graduator

Post by Andy E » Sat, 20 Jan 2001 01:48:32


Hello Jim/Tim,

I'd be interested in a set someday  :-)

Andy



Quote:
>if your asking the with of the alum. thrust ring it's .20" as min. as pos. I
>didn't make this the motor retainer for the reason of I use RMS too, and
>already have clips to hold them in, so the thrust ring holds the SU motor
>from going forward during thrust and the clips hold it from moving back
>during ejection.  I suppose I could build one that would be be a thrust ring
>and a retainer, just step it down on the inside dia. and then spit it a bit
>around the middle on the out side with two fastn'rs, one to clamp the motor,
>one to clamp the motor tube.  I would build it with equal with's of .20"
>with probly a .03" gap between for contraction.  I'll play with it a bit an
>post a note when I have time to build it.  Soo many projects.

>Tim


>> Hello Tim,



>> >It's funny you should say that, I've got two more that I'm building in my
>> >machine shop, I've got a 24 and a 29mm they work great with the inside
>> >nuraled, haven't had a problem yet.  Oh ya they are alum.
>> >Tim

>> How much motor tube is needed for a good retention grip?

>> Sounds interesting.

>> Andy