Estes' Mongoose Repair

Estes' Mongoose Repair

Post by Alan M. Carroll, Codesling » Tue, 21 Jul 1998 04:00:00



A week or so ago I had a very nice launch of my Mongoose (my first
2-stage launch - I still can't believe it took off so perfectly).
Unfortunately, the landing was sub-optimal. We lost sight of the rocket,
but a friendly passing motorist returned what was left of it sometime
later. The body tube is a bit bent up but fixable. The nose cone,
however, is competely trashed. My questions are

1. How do I determine the BT size of the Mongoose? I don't remember
seeing that in the instructions. I'm willing to buy calipers if
necessary (I tried a straight ruler but got wildly inconsistent
results).

2. Given the answer to (1), may I assume that nose cones are labeled in
such a way that a BT-XX tube takes a ??-XX nose cone?

3. Given the answer to (2), where would be a good place on on the Net
to obtain a replacement nose cone? The local hobby shops here in
Champaign-Urbana don't seem to sell nosecones separately.

4. Any tips for re-enforcing the top of the body tube? Is it best to add
support inside or outside?

Thanks!

 
 
 

Estes' Mongoose Repair

Post by The Silent Observe » Tue, 21 Jul 1998 04:00:00



Quote:

> A week or so ago I had a very nice launch of my Mongoose (my first
> 2-stage launch - I still can't believe it took off so perfectly).
> Unfortunately, the landing was sub-optimal. We lost sight of the rocket,
> but a friendly passing motorist returned what was left of it sometime
> later. The body tube is a bit bent up but fixable. The nose cone,
> however, is competely trashed. My questions are

> 1. How do I determine the BT size of the Mongoose? I don't remember
> seeing that in the instructions. I'm willing to buy calipers if
> necessary (I tried a straight ruler but got wildly inconsistent
> results).

The Mongoose uses a precolored version of BT-50, and will accept all
BT-50 nose cones.

Quote:
> 2. Given the answer to (1), may I assume that nose cones are labeled in
> such a way that a BT-XX tube takes a ??-XX nose cone?

Correct -- if you're going to the hobby shop to buy nose cones, you'll
be looking for a PNC-50 assortment, which will most likely include at
least one nose that's an exact replacement, except for color.

Quote:
> 3. Given the answer to (2), where would be a good place on on the Net
> to obtain a replacement nose cone? The local hobby shops here in
> Champaign-Urbana don't seem to sell nosecones separately.

You might try shop-online places such as Hobbylinc, Discount Rocketry,
Atomic Rocketry, etc. -- or you might just pick up the phone and call
Estes (800 number is in the FAQ) and request a replacement nose; they'll
probably just stick one in the mail to you.

Quote:
> 4. Any tips for re-enforcing the top of the body tube? Is it best to add
> support inside or outside?

Soak some thin CA (cyanoacrylate glue) into the tube material at the
edge and for an inch or so inside the tube; this will strengthen and
stiffen it a great deal without changing the appearance noticeably.
Some people also wrap clear packing tape around the outside of the tube
at the mouth -- same idea.

--
 WARNING!!  This area has been designated an official DOPE FREE ZONE!!

      If you're going to be a dope, please do it somewhere else!

Donald Qualls, aka The Silent Observer           NAR # 70141-SR Insured
Rocket Pages             http://members.aol.com/silntobsvr/launches.htm

Opinions expressed are my own -- take them for what they're worth
and don't expect them to be perfect.

 
 
 

Estes' Mongoose Repair

Post by Attican1 » Tue, 21 Jul 1998 04:00:00


Quote:

>A week or so ago I had a very nice launch of my Mongoose (my first
>2-stage launch - I still can't believe it took off so perfectly).
>Unfortunately, the landing was sub-optimal. We lost sight of the rocket,
>but a friendly passing motorist returned what was left of it sometime
>later. The body tube is a bit bent up but fixable. The nose cone,
>however, is competely trashed. My questions are

>1. How do I determine the BT size of the Mongoose? I don't remember
>seeing that in the instructions. I'm willing to buy calipers if
>necessary (I tried a straight ruler but got wildly inconsistent
>results).

Look in the Estes catolog, or on the packaging.  They tell you the size of the
body tube in inches, but not by their BT size markings.

Quote:

>2. Given the answer to (1), may I assume that nose cones are labeled in
>such a way that a BT-XX tube takes a ??-XX nose cone?

Yes.  But you will need to find the right shape of the nosecone.  Just bring
the old one to the hobby shop and compare it with new ones.  If you lost the
nosecone or it is damaged you can just get a mongoose kit off the shelf and
compare the cone in it to the other ones.  I think the mongoose is in a bag.
If it is in a box don't open it to compare (the store owners might not like
that).

Quote:

>4. Any tips for re-enforcing the top of the body tube? Is it best to add
>support inside or outside?

You could just soak it in thin CA.

Hope this helps.

Ben Romashko                              
NAR # 73422 JR                            
Soon to be NIRA # here                  


 
 
 

Estes' Mongoose Repair

Post by Dave Le » Tue, 21 Jul 1998 04:00:00




Quote:
> A week or so ago I had a very nice launch of my Mongoose (my first
> 2-stage launch - I still can't believe it took off so perfectly).
> Unfortunately, the landing was sub-optimal. We lost sight of the rocket,
> but a friendly passing motorist returned what was left of it sometime
> later. The body tube is a bit bent up but fixable. The nose cone,
> however, is competely trashed. My questions are
> 1. How do I determine the BT size of the Mongoose? I don't remember
> seeing that in the instructions. I'm willing to buy calipers if
> necessary (I tried a straight ruler but got wildly inconsistent
> results).

From the catalogue the body is BT50 and the nose appears to be a
BNC-50Y (stretched Alpha).

Quote:
> 2. Given the answer to (1), may I assume that nose cones are labeled in
> such a way that a BT-XX tube takes a ??-XX nose cone?
> 3. Given the answer to (2), where would be a good place on on the Net
> to obtain a replacement nose cone? The local hobby shops here in
> Champaign-Urbana don't seem to sell nosecones separately.

Do you need to keep it original? It's certainly not critical to operation.
Myself I'd carve a new one from balsa.

Quote:
> 4. Any tips for re-enforcing the top of the body tube? Is it best to add
> support inside or outside?

A lot of people run CA around the inside of the top 1/2" or so of the tube,
it does need a light sanding after it has cured as it usually ends up a bit
on the rough side.

Dave  

--
Dave Lee                      5.4.3.2.1. Up Up and...  |\ _ /|
*Weymouth*Dorset*UK*                                    \| |/
http://www.users.zetnet.co.uk/davelee/                   | |
++++++++++++++++++++++++++++++++++++++++++++++++++++++   | |
rec.models.rockets Design Contest                    ____\_/__Oh S$*&!!!
http://www.users.zetnet.co.uk/davelee/rmr/descon.htm        
++++++++++++++++++++++++++++++++++++++++++++++++++++++

 
 
 

Estes' Mongoose Repair

Post by Alan M. Carroll, Codesling » Thu, 23 Jul 1998 04:00:00




Quote:
>Do you need to keep it original? It's certainly not critical to operation.
>Myself I'd carve a new one from balsa.

I ended up getting a new balsa nose cone (apparently there are a lot
more small hobby shops around CU than I realized). I'm not concerned
about keeping it original, other than minimizing the risk of
destabilizing the rocket. It's just an interim until my CrossFire
arrives and gets assembled.

Thanks for all the tips - I have it almost ready to fly again. I used
transparent packing tape on the outside and CA on the inside firm up the
top. I'll see how well that works.