Search found 2397 matches

by OverTheTop
Wed Oct 18, 2017 8:29 pm
Forum: I could use that
Topic: Monster Selection of Surface Mount Resistors
Replies: 0
Views: 7

Monster Selection of Surface Mount Resistors

Just got sick of buying SMT resistors a few values at a time. Thought that there must be cheaper books of these available nowadays. I was right! From eBay, 8500 resistors for $32 AUD :D ResistorsResize.png If you are into SMT this is great to have around. For those more timid, they are available in ...
by OverTheTop
Wed Oct 18, 2017 5:49 pm
Forum: Mid/High Powered Rocketry
Topic: Joe Turners L2 Build Thread
Replies: 49
Views: 699

Re: Joe Turners L2 Build Thread

I usually aim for 80-100fps for drogue or drogue-less, similar to your calculated rate. Usually not a problem. I guess it depends on the rest of your harness/chute etc and how you want to fly. I am only suggesting what is possible :) . Probably treat the alarm in OR as "are you sure you want to...
by OverTheTop
Wed Oct 18, 2017 11:43 am
Forum: Mid/High Powered Rocketry
Topic: Joe Turners L2 Build Thread
Replies: 49
Views: 699

Re: Joe Turners L2 Build Thread

The Ravens are great altimeters. Yes, they beep!

You might want to consider a smaller drogue IMHO. Depends what you want to do with it (it is your flight!) but I generally use no more than 18", and typically around 12".

Anyone else have thoughts on the drogue size?
by OverTheTop
Mon Oct 16, 2017 3:16 pm
Forum: Mid/High Powered Rocketry
Topic: Nike Apache Half-Scale Project
Replies: 78
Views: 7431

Re: Nike Apache Half-Scale Project

A 3" Nosecone Been a little movement on this project lately. I am working towards having a 3" Nosecone version of this so I can get some more altitude. Onto SolidWorks and produced the following CAD models: Base.png Collar.png Cone.png Hit print and here is what you end up with. NCAssembl...
by OverTheTop
Mon Oct 16, 2017 8:39 am
Forum: Higher, Faster, Further
Topic: Vertical Trajectory System (with some 3D printed parts)
Replies: 20
Views: 3141

Bench Stand

Bench Stand Some very basic wiring was added to the base, for connection to the VTS. A momentary pushbutton switch takes care of switching the system between fixed and active modes during bench testing. Having a 3D printed hole to mount it in makes things so easy! DSC07043resize.JPG DSC07044resize....
by OverTheTop
Sun Oct 15, 2017 9:16 pm
Forum: Higher, Faster, Further
Topic: Vertical Trajectory System (with some 3D printed parts)
Replies: 20
Views: 3141

Re: Vertical Trajectory System (with some 3D printed parts)

SOME MORE 3D PARTS We had a new 3D printer delivered at work recently. This has a smaller build volume than our other printer (145x145x175mm) but uses stereolithography as the printing system. Basically liquid resins are spatially cured by LASERs. Many different resins are available: Tough, flexibl...
by OverTheTop
Fri Oct 13, 2017 12:16 pm
Forum: I could use that
Topic: windy dot com
Replies: 3
Views: 76

Re: windy dot com

Excellent find! It does winds aloft as well.
by OverTheTop
Fri Oct 13, 2017 6:11 am
Forum: Rocketry Control Room
Topic: SpaceX SES-11 Launch
Replies: 3
Views: 66

Re: SpaceX SES-11 Launch

I thought they looked like the old aluminium fins before launch. Confirmed on the down by that healthy radiant glow.

They are really starting to get good at this rocket stuff :D . The company is a spectacular success story.
by OverTheTop
Wed Oct 11, 2017 5:54 pm
Forum: Mid/High Powered Rocketry
Topic: Joe Turners L2 Build Thread
Replies: 49
Views: 699

Re: Joe Turners L2 Build Thread

Altimeter bay vents have a different requirement to airframe vents-- alt bay require zero pressure differential to get accurate readings, wereas airframe just needs to bleed out pressure at sufficient rate so as the pressure differential isn't enough to cause separation of the airframe components. ...
by OverTheTop
Wed Oct 11, 2017 12:38 pm
Forum: Mid/High Powered Rocketry
Topic: Joe Turners L2 Build Thread
Replies: 49
Views: 699

Re: Joe Turners L2 Build Thread

Vent holes for the airframe seem to be a bit larger than I would use, particularly the lower section. If it were me I would probably use 3 x 1/8" holes for the top section. Avionics bay is about right for vents IMHO. If you are using one RBF pin and one switch, have you considered just two RBF ...
by OverTheTop
Wed Oct 11, 2017 6:20 am
Forum: Scratch Built
Topic: holes in rocket body tube - how they affect aerodynamics
Replies: 5
Views: 130

Re: holes in rocket body tube - how they affect aerodynamics

Rex has it pretty well covered. Not many people do side hatches for parachute deployment, I think just because it is harder to make and there is some uncertainty with things like you ask. Give it a go :) I think I have seen someone using a servo to release a hatch on a design somewhere. For the came...
by OverTheTop
Tue Oct 10, 2017 8:39 am
Forum: Mid/High Powered Rocketry
Topic: Joe Turners L2 Build Thread
Replies: 49
Views: 699

Re: Joe Turners L2 Build Thread

I have heard it said that three shear pins will stop the separation point rocking, potentially causing problems.

I use two shear pins as a matter of course. Zero problems experienced so far.
by OverTheTop
Mon Oct 09, 2017 4:44 pm
Forum: Higher, Faster, Further
Topic: Vertical Trajectory System (with some 3D printed parts)
Replies: 20
Views: 3141

Re: Vertical Trajectory System (with some 3D printed parts)

Looks really good. Thanks Mat. Answering your earlier question I missed: Looks good, although you seem to be doing a lot of work just use an existing controller. Will you reuses all the parts when you build your own control device? This is my own controller :) Built using COTS parts. Assuming it wo...
by OverTheTop
Mon Oct 09, 2017 10:48 am
Forum: Low Powered Rocketry
Topic: Current LPR designs in the pipe...
Replies: 10
Views: 550

Re: Current LPR designs in the pipe...

Beautiful bird!
by OverTheTop
Mon Oct 09, 2017 10:48 am
Forum: Mid/High Powered Rocketry
Topic: Joe Turners L2 Build Thread
Replies: 49
Views: 699

Re: Joe Turners L2 Build Thread

NOTE: The formula is exactly same one that OTT provided about a year ago. OTT recommended 0.06, so I can see where this comes in. All starting to make some sense. Careful. The constant in the calculation I use is 0.006, not 0.06. You could get some enthusiastic separations with the larger number :s...

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