Launch pads

Discussion on ground control/GSE and recovery equipment. This includes launch pads, triggers, chutes, streamers etc. Includes other items such as simulation and other computer software, etc.

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vance2loud
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Launch pads

Postby vance2loud » Fri Mar 11, 2016 12:47 pm

I finally have a start on some equipment for a club in Tasmania, these just arrived from 80/20.
Now I just have to find time to build a few bases for them.
I like the John Coker bases http://www.jcrocket.com/prorailbase.shtml , but I would either add feet to them or put a bend in the legs so they can conform to a surface which isn't flat.
I was thinking of 1000mm legs out of 25x50 rhs for the smaller 1010 pads and was unsure on steel and leg size for the larger pads.
What are peoples thoughts on base types and what would you recommend?
So far I am looking to make :
3 x 8' 1010 pads
1-2 x 12' 1020 pads
1 x 12' 1530 pad
2 x 6-7' 2020 metric pads for smaller "mini" rail buttons (possibly mount these to triton tripod stands)

Pros and cons to different stands would be appreciated and sometime in April I will order the steel to start welding.
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Re: Launch pads

Postby CATO » Fri Mar 11, 2016 12:57 pm

vance2loud wrote:I finally have a start on some equipment for a club in Tasmania.


I'm in, when do we launch..... :-)
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vance2loud
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Re: Launch pads

Postby vance2loud » Fri Mar 11, 2016 1:06 pm

with how long it's taken me to get this far, I would possibly say early 2017 for the first launch.
I am hoping to get everything ready before September/October this year but for now I will say early next year to be safe.
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Re: Launch pads

Postby Viking » Fri Mar 11, 2016 1:25 pm

I just had some 2020 delivered yesterday (tho not from 80/20), can't make my mind up on a base so interested to see what you do with it.
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vance2loud
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Re: Launch pads

Postby vance2loud » Fri Mar 11, 2016 2:20 pm

for the 2020 I will most likely use these tripods and have the 1/4 and 3/8 rods available to swap between them,
I have been given a few pieces of 5mm stainless so I might replace the galv blast-plate though.
Check the groove width of your 2020 as I tried some from another supplier and the mini buttons didn't fit.
That reminds me, I better go and find my mini buttons and try them before I go any further
For reference the 80/20 2020 metric rail has a 5.25mm slot whereas the 2020 that I bought from Aururum has a 6.3mm slot and not enough depth to use the 1010 buttons.
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I have not failed. I've just found 10,000 ways that won't work.
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Re: Launch pads

Postby Viking » Fri Mar 11, 2016 2:38 pm

Nice tripod!
I was thinking Qubelok/Connect-It for legs, but not sure what to do for angle adjustment yet.
The 2020 I have is from RS Components (http://au.rs-online.com/web/p/tubing-struts/8508470/)
Also known as Profile 5, as in 5mm channel width.
Was $26 for a 2M length including GST, delivery free.

I'm also looking for MakerBeam rail (10mmx10mm) for LPR, but doesn't look like anyone has it in Australia.
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vance2loud
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Re: Launch pads

Postby vance2loud » Fri Mar 11, 2016 2:48 pm

I also looked at the RS rails and ordered 2 of the larger variants hoping they would fit 1010 buttons, No Luck!
At the time I didn't consider the smaller rail for the mini's as I don't currently have any in use.
The free shipping is a huge bonus when anything is being shipped to Tasmania.
Have you got any mini buttons to try? I have some in storage and I just ordered a heap more so I can have them available for anyone that wants to use a rail rather than a rod when I get the club started.
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I do it because i can, I can because I want to, I want to because you said I couldn't. - Unknown
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Re: Launch pads

Postby Viking » Fri Mar 11, 2016 3:15 pm

Yeah RS don't have a 1010 equivalent unfortunately. Closest they have is 2222 with 5.6mm channel and 3030 with 8mm channel.
I didn't really like the look of the mini and micro buttons, they seem to have huge groove widths and are 3 piece (washer-tube-washer?). I've just been turning my own buttons from Delrin, with the groove a little wider than the thickness of the rail.
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Re: Launch pads

Postby vance2loud » Fri Mar 11, 2016 7:20 pm

Back to the original question,
I have been reviewing the John Coker plans again and realised that they are built out of 3" aluminium SHS, that seems like overkill to me but now I am unsure if 25 x 50 would be strong enough,
What are peoples thoughts on this?
What length legs would be recommended for a 1010 rail base? I was thinking 1000mm, does that seem adequate?
If I go with this style I would possibly make the 1515 base with 50 x 75 with a leg length of 1500mm, does that seem suitable?
As I have only had experience with the rail pads at Serpentine, if anyone has other suggestions I am all ears.
TRA #15165 AMRS #50
I do it because i can, I can because I want to, I want to because you said I couldn't. - Unknown
I have not failed. I've just found 10,000 ways that won't work.
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Re: Launch pads

Postby SpaceManMat » Fri Mar 11, 2016 9:47 pm

Have you seen the pads Nic designed for Thunda?

http://thunda.com.au/faqs/get-your-butt ... t-issue-6/
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Re: Launch pads

Postby vance2loud » Fri Mar 11, 2016 10:00 pm

I hadn't but it looks like a good easy design both for building and set-up. From the pictures it looks like 50mm pipe, what would the maximum rocket size be for those?
Does anyone have any more info on the design?
TRA #15165 AMRS #50
I do it because i can, I can because I want to, I want to because you said I couldn't. - Unknown
I have not failed. I've just found 10,000 ways that won't work.
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Launch pads

Postby kopius » Sat Mar 12, 2016 12:22 am

Gents, first off can I make a suggestion and that is to stick with the standard 1010 and 1515 or variants that are so commonly used and stay away from other close/random sizes. Having run the biggest launch in this country, I know first hand that you will save so many headaches of trying to get people to change buttons or taking your own rockets elsewhere and have to accommodate because of going non standard. 8020 is readily available and reasonably priced and using those products will mean you are using an international standard.

Now as for Nic's design, that is what we use entirely in QLD and what ran the entire Thunda event. Whilst they look basic, they will easily take a rocket in excess of 80kg and can quickly interchange between rail lengths and sizes. They also weigh next to nothing and you can carry 2 stands complete with rails with ease. Sure there are other designs which may be cheaper, but having been through many designs, these have been noted by many (including guys from the USA who have been flying for decades) as they cleanest and best design they have ever used.

Happy to talk off the forum about these.


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Re: Launch pads

Postby Viking » Sat Mar 12, 2016 4:11 am

kopius wrote:Gents, first off can I make a suggestion and that is to stick with the standard 1010 and 1515 or variants that are so commonly used and stay away from other close/random sizes....

Makes perfect sense. I was not mentioning them as substitutes for 1010 or 1515 for HPR use.

80/20's 20mm, OpenBeam's 15mm and Makerbeam's 10mm rails however seem to be gaining some traction in the US as substitutes for the 1/4" and 1/8" rods.
I'll only be using the 20mm (and 10mm if I can find it) for non-club launches of my LPR/MPR stuff.
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vance2loud
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Re: Launch pads

Postby vance2loud » Sat Mar 12, 2016 6:03 am

kopius wrote:Gents, first off can I make a suggestion and that is to stick with the standard 1010 and 1515 or variants

Kevin at 80/20 is great to deal with and my order arrived a lot faster than I expected.
I got the 8' 1010 rails and then thought for extra strength with the longer lengths to get the 1020 and 1530 respectively.
So I kept with the standards there just going with a thicker profile for all rods over 8'.
the metric 20-2020 from 8020 gets a lot of mention on US sites as a better option for LPR/MPR such as the Estes pro series rockets.
I figured that it would be the better option compared to a 1/4" or larger rod.
With what I ordered the plan is to have;
6 x 1/8 rods
2 x 3/16 rods
2 x 1/4 rods (possibly 1 with the LPR pads and 1 with the MPR pads)
1 x 3/8 rod (preferably not using this but will have it available)
2 x 20-2020 rails (possibly 1 with the LPR pads and 1 with the MPR pads)
3 x 1010 rails x 8' long
1 x 1020 rail x 14' long (I have a few of these but was only going to run one to start with)(I figured that the extra length could be useful for some designs and/or motor combinations)
1 x 1530 rail x 14' long ( I figured that at 14' long the extra strength of the double thickness profile would be a benefit )

I think I have covered all the standard sizes and I do have a few spare rods available for if I need more of them.
Does that seem like a reasonable mix to get a club started? Did I miss any common sizes?
I will give you a call sometime soon regarding the launch pads Blake, I like the look of them. They appear to have a similar amount of materials as the other design I was looking at so weight should be similar.
Does anyone have any other suggestions?
I'd rather consider too many now than get shown something else once I build them and wishing I had incorporated it into the design.
TRA #15165 AMRS #50
I do it because i can, I can because I want to, I want to because you said I couldn't. - Unknown
I have not failed. I've just found 10,000 ways that won't work.
- Thomas Alva Edison

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Re: Launch pads

Postby kopius » Sat Mar 12, 2016 8:07 am

I would drop the really large rods and make ppl use buttons or a tower launcher (lug less). That is another thing I can help you with and cut out some lugless 'clovers'.

At QRS, we have 3mm and 6mm rods and that covers everything. As the rockets get bigger, Rods really suck and rails are your best friend (no rod whip).

FYI Our stands are made from aluminium which makes them extremely light and no rust.


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