Quantcast

Bigger Bertha

The Rocketry Forum

Help Support The Rocketry Forum:

lessgravity

Well-Known Member
Joined
Jan 18, 2009
Messages
1,037
Reaction score
2
I was looking around my Rocket Shed wanting to do a new scratch build. My eyes fell upon a tube that measured about 2.8 inches in diameter and was thick walled. Then my eyes fell upon my old trusty Big Bertha.
Upscale!
I created this fun upscale I call the Bigger Bertha. It is about 25% bigger than a Super Bertha and should fly nice on G's. It's 29mm and will be a nice mid-range Rocket. Next step will be a 4 inch diameter Bertha I plan to build this summer.

I plan to fly her on Saturday at our club launch if the weather holds.
Here she is next to my Big Bertha:

BiggerBertha.jpg
 

Luv2launch

Well-Known Member
Joined
Jan 18, 2009
Messages
461
Reaction score
2
Nice one I been wanting to do an upscale bertha for awhile now, where did you get the nosecone is it a custom?I was thinking doing a Bertha in a 3 inch diameter.
 

jimzcatz

Boss, Carolina Rocket Mafia
Joined
Jan 22, 2009
Messages
3,927
Reaction score
166
Location
Hurdle Mills NC
Back in the day,Bob Sisk buile a 7.5" BB. Did his L3 with it. Sandman from Roachwerks is who I recommend for the noses. They are tha same as mosquitos,only bigger.
 

lessgravity

Well-Known Member
Joined
Jan 18, 2009
Messages
1,037
Reaction score
2
Nice one I been wanting to do an upscale bertha for awhile now, where did you get the nosecone is it a custom?I was thinking doing a Bertha in a 3 inch diameter.
Did the nosecone myself. Balsa layers turned on my drill press (works pretty well as my lathe). I'm sure you can get one from Sandman as Jim mentioned.

Jim - I would love to have seen the the 7.5'' BB.
 
Last edited:

wickball

Well-Known Member
Joined
Jan 18, 2009
Messages
287
Reaction score
0
I believe you're pretty close to the size of a Super Big Bertha, it was based on a BT-80, about 2.6 inches.

wick
 

lessgravity

Well-Known Member
Joined
Jan 18, 2009
Messages
1,037
Reaction score
2
I believe you're pretty close to the size of a Super Big Bertha, it was based on a BT-80, about 2.6 inches.

wick
Yes the Super Bertha is about a 150% build and mine is about 175% at 2.884 inches in diameter. It much heavier also because of the thick walled tube.
 

aerospike

Well-Known Member
Joined
Jan 24, 2009
Messages
225
Reaction score
0
Performance Hobbies (not Performance Rocketry) will soon have a 4" version of the BB.
 

lessgravity

Well-Known Member
Joined
Jan 18, 2009
Messages
1,037
Reaction score
2
Performance Hobbies (not Performance Rocketry) will soon have a 4" version of the BB.
Yes - Ken was there to see my launch this weekend and we discussed the 4 inch model.
Here is a picture of mine on the pad. A friend caught a takeoff picture and is sending to me today. I'll post then.

biggerberthaonpad.jpg
 

DaveCombs

Well-Known Member
Joined
Jan 19, 2009
Messages
3,066
Reaction score
3
How about this for an up-scale.
The real trick is this: It's a regular Bertha next to a plastic model 350Z, and he actually downscaled the house, driveway and palm trees! :eek:

Really nice Bertha. I'm a big upscale fan too.
 

foose4string

Well-Known Member
Joined
Jan 18, 2009
Messages
2,833
Reaction score
7
Looks good LG!

How about this for an up-scale.
Adds new meaning to the words "Big" Bertha.

How about this one built by fellow club member, Jim Cox? Flew beautifully on an M motor, recovery was another matter entirely. That's me holding the normal sized Bertha for size comparison.....

Biggest-Bertha.jpg
 

rokitflite

Well-Known Member
Joined
Jan 18, 2009
Messages
5,105
Reaction score
2
Thats scary hairy Craig Jim... Remember, he plays in a band.;)
 
Top