Fixing Big Bertha, and some upgrades..

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86mustang408w

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This was the only causality in my old collection that needs real saving. I stepped on it some time back, but the ejection baffle saved it. Cut the tube down already, added a screw eye bolt, have a coupler and BT. Gonna label the fins and add fillets. Along with a new shock cord, and chute swivel. This is what I have done so far..
 

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Painted the Olympus, so doing the fins now on my extended Big Bertha. Almost done then CA, let that dry for a bit then fillets overnight, along with sandable primer and dry time. Maybe paint 2morrow, one down 15 more to fix, lol..
 

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Painted the Olympus, so doing the fins now on my extended Big Bertha. Almost done then CA, let that dry for a bit then fillets overnight, along with sandable primer and dry time. Maybe paint 2morrow, one down 15 more to fix, lol..

That is a lot of body tube to pressurize. Are you still running an 18mm motor? I'm bringing this up as I've had ejection issues with a stock non-stuffer tube bertha.

I'd also weight the completed rocket to ensure that it can still fly on an 18mm motor. You might be looking at a Q-Jets to fly that.
 
That is a lot of body tube to pressurize. Are you still running an 18mm motor? I'm bringing this up as I've had ejection issues with a stock non-stuffer tube bertha.

I'd also weight the completed rocket to ensure that it can still fly on an 18mm motor. You might be looking at a Q-Jets to fly that.
Its flown many times, does great from a A8-3 to a C6-5. My fat foot just stepped on it one time, and luckily the ejection baffle saved it. I got a size 15 foot..lol. Its still an18mm motor of course, and I added a about a 10" length of body tube with a coupler so its about 34" high rn..Soon as its fixed and ready to fly, ill post videos on here. It fly's nice, one of the better rockets I've owned. And those ejection baffles work wonderfully. I have them on a few of my rockets. So back in 2013 when I got back into it. Bought a holesaw kit that goes from 3/4" to 5" in perfect BT tubes sizes. I bought Estes coupler packs, and starting making my own. Ill get back to that soon too maybe. But stepped up to making my own parachute protectors since I got back into this 5 weeks ago or so from idk how many yards of orange nomex I got got off ebay for 7 bux. So I'm making a few sizes then then attaching a clip swivel to it, and make it usable on all my small rockets with just a few seconds of unclipping it, and putting it on the one your gonna fly next. Saving me tons of $$ on more baffles and wadding. But hobby lobby sells the Pro-Series II wadding for 8 bux you get 200 sheets? I use like one sheet square on my Alpha III size, and one and a half of the precut lengths they give you for my Cherokee-E. Not sure about the Big Daddybor BT-80 size, prob gonna use protectors for them. Check around the LPR forum and look for my threads about getting my collection back, its right on the main forum LPR forum page. Here's some pics..
 

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Gor the first coat of sandable primer on, gonna sand and use filler, and sand, and paint. Fins done with labels and CA. Sand and paint all night..
 

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That is a lot of body tube to pressurize. Are you still running an 18mm motor? I'm bringing this up as I've had ejection issues with a stock non-stuffer tube bertha.

I'd also weight the completed rocket to ensure that it can still fly on an 18mm motor. You might be looking at a Q-Jets to fly that.

 

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That is a lot of body tube to pressurize. Are you still running an 18mm motor? I'm bringing this up as I've had ejection issues with a stock non-stuffer tube bertha.

I'd also weight the completed rocket to ensure that it can still fly on an 18mm motor. You might be looking at a Q-Jets to fly that.
I'm going to get an Altimeter soon, so I don't have that data. But give me a little and ill weigh it, it just still 18mm if you want that info for yourself. I have a Super Big Bertha too, I'm making a booster section for right now, Its wild. I'll post that later today or 2morrow once I get the fins done. Printed out templates off OpenRocket last night for that, gonna cut and build today. Might make 2 sections, one in 24mm for E and a spacer then for D's but only use one at a time. Then the D12-3 will basically be for the ejection event. Then maybe one in 29mm to give me wider range of motors but am concerned about a composite booster to a blackpowder motor, so..... I have it all and plans for both, already mocked it up, so I'll have info on that. and the Rocket is already built, so its a thinker for sure. I'm just waiting on CR's too. Soon as I get a laser cutter, things will be better for my builds.
 
Just picked up aome Quest Q-Jet C18-4w's, should be a cool flight..I will post that flight soon..
 

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Well this happened to Super Last night...lol..Over in Mid power forum..
 

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I weighed it, my old scale wasn't off. But Big Bertha is 125/6 grams w/o motor. Idk where I got the 190g or so I might have posted? Big Daddy was 211g on the old, and 213g on the new.
 

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Picked up some Q-Jet C18-4w for this, interested in seeing how it responds. I've watched videos and curious to see if it will fly well. Its gonna be a quick burst over a longer burning C6-3 or whatever BP motor. Still thinking and testing will start soon. I will use OpenRocket for this one first foe flight sims to see how high it will approximately take it...Any insight is appreciated..
 

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