Quantcast

Other solutions for keeping your nose cone weight in place.

The Rocketry Forum

Help Support The Rocketry Forum:

kuririn

BARGeezer
TRF Supporter
Joined
Oct 3, 2016
Messages
5,008
Reaction score
2,620
Location
Hawaii
From the OP's posts on other threads I'm assuming we're talking low power here.
If I'm wrong then please forgive me.
So why make this more complicated than it needs to be?
Fill the cavity with PU foaming glue, let it cure overnight, problem solved.
KISS
Takes the same amount of time as using yellow glue, with the added benefit of locking the weight in place mechanically with the expanded foam if the adhesion should fail.
No brainer.
Rant over.
 

BABAR

Builds Rockets for NASA
TRF Lifetime Supporter
TRF Supporter
Joined
Aug 27, 2011
Messages
6,752
Reaction score
1,898
Keep in mind that this will tend to tug on the weight at ejection, trying to pull it loose.
I thought about that. On the other hand, at launch the force is all going to be on the interface between the weight and the nose cone as well. I am thinking you need two attachments for the shock cord one for the nose cone and one to the nose weight
 

jrap330

Retired Engineer, NAR # 76940
TRF Supporter
Joined
Jan 25, 2020
Messages
439
Reaction score
129
Location
NJ
Gorilla glue is a polyurethane glue. it needs water to activate (it says to spray one side with water to ensure bonding)

And, just so everyone knows, "Gorilla" glue isn't perfect either. (This is LePage's version: a Polyurethane glue; a Canadian manufacture of glues) This is a few ounces that came loose one flight (after a few). It was the weight in my Binder 2.6" Aurora. I've since gone with the shot, epoxy & dowel method. And yes, I didn't really sand the inside all that much..

(We really, as a collective, need to pressure our kit makers to use something other than whatever Poly plastic they use to make NC. Glues & paints never really stick!!)


View attachment 422489 View attachment 422490
DR Wogz..thanks for explanation of Gorilla glue. I will try this in future. To Original poster, my Sizzler nose cone with 5 min epoxy and fishing weighs still is holding 10 years later. Again only time I tried weights.
 

MALBAR 70

More Rockets Than Room
TRF Supporter
Joined
Aug 18, 2012
Messages
2,223
Reaction score
582
Location
Athol, Massachusetts
I'll +1 Gorilla Glue. I've been using it for years to keep nose weight in place. Usually, I pour in the shot, hose in the GG and give it a little shake and tap to get the glue to the tip. Add little splash of water and in a couple of hours it'll have foamed up. I learned to let the nose cone sit for a day or two, just to ensure the glue has cured completely, I have had it ooze out and gum up the inside of a rocket. I have also, on one occasion had Gorilla Glue expand and burst the tip of the plastic cone (Estes Conquest) at the seam.

To the OP, I think you are overthinking the nose weight issue, there are LOTS of rockets are perfectly stable without any nose weight whatsoever, especially in low power.
 
Last edited:

SecondRow

Well-Known Member
Joined
Jan 29, 2019
Messages
558
Reaction score
385
I have also, on one occasion had Gorilla Glue expand and burst the tip of the plastic cone (Estes Conquest) at the seam
Why were you adding weight to the Conquest? Did you mod it or did the stock kit need more? I’m in the middle of building one right now.
 

MALBAR 70

More Rockets Than Room
TRF Supporter
Joined
Aug 18, 2012
Messages
2,223
Reaction score
582
Location
Athol, Massachusetts
The two pats of clay that come with the kit are sufficient, I was using the Gorilla Glue to hold in the supplied clay weight.
I think the seam on that particular cone was weak, I ordered a new one and it held up fine.
The Conquest is a great looking kit and, surprisingly, it flies excellent.
 
Last edited:

School of Rock'et'

Well-Known Member
Joined
Jun 11, 2019
Messages
56
Reaction score
15
Location
Midland, MI
I drill holes in the nose cone to insert 2 nails at 90 degree angles to each other (we're adding weight, right? why use sticks?). I use Rocksim to sim out how much weight I need for the biggest motor I think I'll use so I get 1 caliber separation between the CP and CG, weigh out 80% of that weight in BBs and 20% in epoxy. Mix, pour, let set. Trimming the nails off is easy with a Dremel (everyone should have a Dremel). Trim them a little deep, fill with spot putty and sand. I do this rather than PML expanding foam because on birds 2.6" and bigger, I fashion my own two piece bulkhead so I can use an Eggfinder in the nose cone; otherwise PML foam is the bomb.
I've been thinking of using this idea, only I have a 5:1 Ogive TWFG NC that forms aft towards the payload by a 7.75" diameter coupler. I'm wondering if only 2 nails will work as I have about 14.5 lbs of weight to add to my level 3 project. I suppose I could add more. Does the pml foam weigh anything significant as well?
 
Top