#1
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24mm engine in place of 18mm?
Can I do this with a rocket whose lower body tube is 24mm and I just skip inserting the 18mm motor mount? This is for an Estes Photon Disruptor assembled with CA glued fins and body tubes with some sanded wood filler all around (extra strength?) The upper body tube (33mm) is being extended ~ 4 inches as I didn't get the ejection baffle installed low enough.
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#2
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Watch the CG but this should flt well on a D motor
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Did the chicken really cross the road, or did the road move beneath the chicken? Albert Einstein You Can't break the laws of physics but they can break you. Christine McKinley Dale Greene Mentor, Penn Manor Rocket Club VISIT SPAAR 2010 Calder Cup The Old West 2009 Calder Cup " Speaking the Truth in times of universal deceit is a revolutionary act. " George Orwell |
#3
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You will need to use one of those green centering rings that were intended for the 18mm mount as a thrust ring for the 24mm motor. Forget about the motor hook and use friction fit for motor retention.
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I love sanding. |
#4
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I have an expended E motor. I'll saw off a 1/4" and use that in the 24mm tube for the motor block. An I'll cut off a 1/2" piece to use as a spacer and start with a D12-3. I have some Kevlar strings being glued to the top of the baffle to form a 3-string anti-zipper shock cord attachment point.
Unfortunately, I already glued the green ring to the 18mm mount. I 'll work things out so I can slide in the 18mm mount...for windy days. Thanks all |
#5
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Sounds good.
Go BIG or go HOME !
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, AGITATION, CHAOS, TURMOIL, FIASCOS, AGGRAVATION, INSTIGATION, NUISANCE-ACTION, and HAVOC ! |
#6
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Quote:
Buy a rings 'o' plenty from Apogee or get a ring assortment from Semroc (or whomsoever your favourite vendor may be). You can always find a use for rings... If you are going to use an 18mm adapter your going to have to find a way to engage the adapter in the main tube. Otherwsie it will spit the 18mm on ejection charge.
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Gravity is a harsh mistress SAM 002 NAR 91005 "The complexity of living is eminently favored to the simplicity of not." |
#7
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Not a warning about the conversion, but an observation about using CA...
They don't hold fins well. In my experience, CA is a bit too brittle for the stresses of launch and landing, so for the fin-to-BT attachment, I'd strongly recommend using something like Titebond (I, II, or the new Translucent formula) instead. A balsa-to-balsa joint may be OK if the glue is fresh enough; but if it has any age on it, go get a new bottle. Use the medium-viscosity, too, not the thin. Been there, done that, had to un-done it, too...
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#8
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I would endorse with only one qualification. If the joint is tight already, then use a thin formula first. The mechanism of CA is to penetrate and then form rigid chains; hence the bond. If the surfaces are gappy, then the adhesive simply bonds on the surfaces. The counter is that no amount of glue is as strong as a solid, tight joint with a good penetrating adhesive. The thinned Aliphatic branded as Super Phatic is IMHO the best of both worlds. It will wick straight from the bottle and penetrates extremely well. Once cured, there is a higher level of flexibility in the joint that you would achieve with a CA.
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Gravity is a harsh mistress SAM 002 NAR 91005 "The complexity of living is eminently favored to the simplicity of not." |
#9
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no matter what
always , always go one size bigger on a motor mount , you can always sleeve down.
I know this guy who spent nealy 100 hrs on a project , that in the end nothing in 24mm could fly it ( perhaps with a cti Imax it MAY fly ) , so always over build |
#10
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Quote:
My suggestion is to leave the thrust ring out of the rocket entirely. Instead, use masking tape to create a thrust ring at the end of the motor. That way you can use any length 24mm motors (Estes D-12 or E-9, for example) without worrying about spacers, etc.
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