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Biggest Big Bertha

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wadavidson

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Starting a new project to go along with the Big Ivan.

Didn't do a great job of documenting the build so I am starting earlier on this 11.75 inch diameter Biggest Bertha.

Will be built utilizing PML glassed tubes, along with fillament wound glass, 1x 98mm and 4 x 54mm motor mounts.

Still determining what the motor combo will be but expecting empty weight to be around 100-120 lbs. Probably an Aerotech full M or N surrounded by DMS K motors.

Should be a really cool rocket and flight. Shooting for this years LDRS.

1481330064855.jpg
 

wadavidson

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1 inch thick ply fins laminated with phenolic. Water Jet cut

1481330211198.jpg
 

dhbarr

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These megagoons are so cool. Keep up the good work!
 

Woody's Workshop

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I'm been a Bertha Fan since 1970.
I got one of them Super Big Bertha's in my collection.
I'm going to clone it with a 29mm Engine Mount.
I'll like this one, :cheers:
:pop:
 

wadavidson

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I think just about everyone has had a big Bertha in one form or another, thats whats really cool about building a super upscale, many can relate to it.
 

wadavidson

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i expect this one to go quick once I get rolling on it. Will take lots of pics
 

ECayemberg

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This is so sweet! Watching with interest!!!

Is the phenolic lamination in sheet form? Like a certain grade of garolite?

-Eric-
 

Viperfixr

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Awesome project...subscribed! "Biggest Bertha" indeed.
 

Rex R

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and it looks like he has an person 'interested in being a passenger :)
Rex
 

wadavidson

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Have installed the motor mount 1x98 and 4 x 54. Utilize two 1/2 inch ply plates laminated for 1" thick rings.

Using my favorite epoxy, Panel Bond.
3M product for adhering fiberglass and metal panels to vehicles. Ridiculous shear strength and ease of use.
 

PhlAsh

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Crap.
I went the wrong way on the scale...

 

ThirstyBarbarian

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Wow! This really is an incredibly big Big Bertha. If you know anyone named Bertha, maybe you could offer her a ride in it.
 

RFMan

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Man, that really puts the "Big" in "Big Bertha"! Very impressive.
 

ECayemberg

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Awesome project! What a beast!

April is a jam packed month, but maybe a quick road trip is in order!
 

Bat-mite

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I do soooooo hope you are able to launch this at LDRS. May I volunteer to help you get it on the pad?

Makes my Formula 200 look like a MPR!
 

DAllen

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Holy guacamole

Those fins have their own zip code...
 

MaxQ

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Forward bulkhead laminated and u-bolts installed
Maybe one of you very large project builders can weigh in on this question...at what point in weight /size do you have to go to forged eyebolts, rather than the typical stainless steel product we get at the local hardware store?
 
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