Search found 291 matches

by joeman
Fri Aug 17, 2018 9:22 pm
Forum: Scratch Built
Topic: Joe Turner's 38mm Scratch-Build
Replies: 6
Views: 238

Re: Joe Turner's 38mm Scratch-Build

Made a few improvements. * Replaced Aluminum Tube with 3-d print - same dimensions, except for the length - now 40mm. Extra length...extra surface area...extra adhesion, greater safety factor. * Also added grooves in the 3-D print. * Replaced the shackle with two smaller shackles. IMG_5837_alt_sml.j...
by joeman
Thu Aug 16, 2018 9:50 pm
Forum: Scratch Built
Topic: Joe Turner's 38mm Scratch-Build
Replies: 6
Views: 238

Re: Joe Turner's 38mm Scratch-Build

Oh,
Does anyone have a SPENT Pro38 6G motor liner, end cap,rear closure etc they want to sell me? :D
(already got the motor casing)

I want to do a trial fit...see how things look BEFORE I glue.

Cheers

Joe
by joeman
Thu Aug 16, 2018 9:45 pm
Forum: Scratch Built
Topic: Joe Turner's 38mm Scratch-Build
Replies: 6
Views: 238

Re: Joe Turner's 38mm Scratch-Build

Hi, The MD retention system I purchased is just a little bit too tight to get down the air-frame, even with some sanding. So I've been working on an alternative MD retention system. I'm not too fond of drilling holes in the air-frame to hold the MD "block" in place. To me a glued in system...
by joeman
Thu Aug 09, 2018 11:13 am
Forum: Scratch Built
Topic: Joe Turner's 38mm Scratch-Build
Replies: 6
Views: 238

Re: Joe Turner's 38mm Scratch-Build

Hi Drew, Yes, the motor is designed to overhang it. Yes, so there will be some gap - and the additional drag that comes with it :-/ [The idea of a tailcone had crept into my mind and a did a few sims, but didn't get past that stage]. It'd be handy to have a closure just to see how it looks and fits....
by joeman
Wed Aug 08, 2018 1:37 pm
Forum: Scratch Built
Topic: Joe Turner's 38mm Scratch-Build
Replies: 6
Views: 238

Joe Turner's 38mm Scratch-Build

Hello, I've decided to start a thread of a new Rocket I'm building; My first Scratch-Build. Below is a screenshot taken from OpenRocket. openrocket.jpg My two main goals are:- (1) Flight Flexibility - keeping my options open as to what I fly it on e.g. Can put in a G motor - MPR or put in the larges...
by joeman
Fri Jul 20, 2018 2:08 pm
Forum: Scratch Built
Topic: Airframe choices (or why you should consider rolling your own airframes)
Replies: 44
Views: 1637

Re: Airframe choices (or why you should consider rolling your own airframes)

Hi OTT, No I hadn't thought of that. Another idea to add to the pot. I don't think I'll be able to avoid having to apply some epoxy to deal with little defects to the external surface. So I constructed something to rotate the air-frame while it cures. Motor/gear-box from Jaycar - 160RPM Did a 3-D pr...
by joeman
Wed Jul 18, 2018 6:05 pm
Forum: Scratch Built
Topic: Airframe choices (or why you should consider rolling your own airframes)
Replies: 44
Views: 1637

Re: Airframe choices (or why you should consider rolling your own airframes)

G'day! Just did my fourth test run. I decided to reduce the amount of hardener slightly to increase pot-life, so I'm not so rushed. I can take my time and make sure everything is wetted out. I also cut 10mm off the brush bristles to effectively stiffen it a little...help me push the epoxy through th...
by joeman
Sat Jul 14, 2018 10:43 pm
Forum: Scratch Built
Topic: Airframe choices (or why you should consider rolling your own airframes)
Replies: 44
Views: 1637

Re: Airframe choices (or why you should consider rolling your own airframes)

My understanding is that the Epoxy provides the compressive strength of the composite. The CF provides the tensile strength. As the rocket flies it gets bending moments....one side has tensile stresses and on other side has compressive stresses. The air-frame needs to be able to handle both. I don't...
by joeman
Sat Jul 07, 2018 9:23 pm
Forum: Scratch Built
Topic: Airframe choices (or why you should consider rolling your own airframes)
Replies: 44
Views: 1637

Re: Airframe choices (or why you should consider rolling your own airframes)

Hi Drew, Thanks for feedback. Adjusted my setup/procedure a little:- - Use just one piece of Glad Bake (I had two individual pieces last time) - Ditched the scotch tape and used a very thin film of glue from glue stick - Kept the build of the tube close to one end....last time I had it 20cm from one...
by joeman
Sun Jul 01, 2018 9:21 pm
Forum: Scratch Built
Topic: Airframe choices (or why you should consider rolling your own airframes)
Replies: 44
Views: 1637

Re: Airframe choices (or why you should consider rolling your own airframes)

Hi, I had a go at making an air-frame this weekend. It didn't go as well as I had hoped, but considering it was my first one, I guess it wasn't too bad. I left the Air-frame to cure over night and the next morning I was unable to remove the air-frame from the Mandrel. It did slide a bit...but after ...
by joeman
Fri Jun 29, 2018 9:48 am
Forum: Scratch Built
Topic: Airframe choices (or why you should consider rolling your own airframes)
Replies: 44
Views: 1637

Re: Airframe choices (or why you should consider rolling your own airframes)

I've been having a "play" with Glad Bake on the "possible" pipe I'll use as a Mandrel. I figured this is a very important thing to get right because so many people seem to run into some grief removing their finished air-frame. NOTE: I've taken note of Drew's comment regarding two...
by joeman
Fri Jun 29, 2018 9:27 am
Forum: Scratch Built
Topic: HPR X Wing - T70
Replies: 12
Views: 1109

Re: HPR X Wing - T70

Yes, there is quite a bit to coordinate to get it to fit together well. Here is a screenshot of how it looks prior to printing 1 square is 10x10mm Width is 50mm Height is 74.3mm bb-3d.jpg Hopefully this will help you refine things...get closer to what is required. IDEA: Possibly adjust the 3-d print...
by joeman
Thu Jun 28, 2018 11:44 am
Forum: Scratch Built
Topic: HPR X Wing - T70
Replies: 12
Views: 1109

Re: HPR X Wing - T70

In last post, the reference to green/grey was in regards to my 3-D print filament that I have.
by joeman
Thu Jun 28, 2018 11:37 am
Forum: Scratch Built
Topic: HPR X Wing - T70
Replies: 12
Views: 1109

Re: HPR X Wing - T70

What a creative build :)


Perhaps with 3-d printing if you pick something off thingyverse...and it isn't too big/complicated, I might be able to print it off for you and send down your way.

https://www.thingiverse.com/


Green (not much left), gray.



Cheers

Joe
by joeman
Sat Jun 16, 2018 8:53 am
Forum: Scratch Built
Topic: AUK XIII - L2 Build
Replies: 13
Views: 429

Re: AUK XIII - L2 Build

Well done :D

Go to advanced search