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Read October 01, 2009, 08:42:43 PM #15
johanngr

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Re: 10km Above the surface of the Earth!
The only question now is how big to make the Entacore Electronics sticker!

It looks like we'll get this project done in no time.

As for the motors.  I suggest a fast-burn hot motor for the 1st stage and a extended burn motor for the second stage.  Both will be 102mm M motor.  My initial simulations show we should get to 10km with room to spare.

As I always say . . . The only way to know, is to do it!  Let's do it!

What would be a reasonable target date for the launch to take place?  Three months from now?  Sooner?  To build the rocket will take about two weeks.  Testing the motors can happen within a week after getting them from the machinist.  I may have someone to make the nozzles for us.

Talking about nozzles.  Well use an expansion ratio that will be optimal for each of the motor burns.

Also, I want to give a student group a chance to put a payload in the upper stage.  I suggest we have a few groups send us their ideas and we'll choose which payload will get the chance.


Johann - The Rocket Guy!
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Read October 02, 2009, 08:50:10 AM #16
booster 11

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Re: 10km Above the surface of the Earth!
David

like the idea of the aim xtra sound s good the only thing is to get the rocket built and the motors tested

The Rest of the current team

Ok then we have an idea of how the rocket is going to work (2 stage) both minimum diameter airframes kind difficult to build an interstage coupler into one of those rockets but it can done.

I can build the airframe in two weeks time give and take a little

David isn't there a possibillity to upgrafe the sensor on the aim xtra to a 100k feet sensor


South African Doctor Rocket
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Read October 03, 2009, 08:46:06 PM #17
David

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Re: 10km Above the surface of the Earth!
Quote from: booster 11 on October 02, 2009, 08:50:10 AM
David

like the idea of the aim xtra sound s good the only thing is to get the rocket built and the motors tested

The Rest of the current team

Ok then we have an idea of how the rocket is going to work (2 stage) both minimum diameter airframes kind difficult to build an interstage coupler into one of those rockets but it can done.

I can build the airframe in two weeks time give and take a little

David isn't there a possibillity to upgrafe the sensor on the aim xtra to a 100k feet sensor



Hi,

The sensor can go up to 45k feet, which is well over 10km, but in case anyone wants to go higher,
the GPS can handle up to 60km, which I doubt we will be getting to anytime soon!

I would like to contribute a unit to the project, but would obviously like to be more involved in the project, such as its installation and setup of the device, as well as other electronics on-board.

I can also help out with simulations (custom), as this is one of the things I studied. I will get hold of Johan and get some numbers so I can run some simulations of my own. The more the merrier!

I would also like to get the unit back after launch, whether successful or not, as its an expensive piece of equipment and I'm on a VERY tight budget at the moment.

The development cost of this device is going to take some time to recover, and I will have to rely on international sales to cover my expenses.

I hope thats all OK, and im not sounding stingy!

Cheers

P.S. email me at david.debruyn _ at _ entacore.com if anyone would like to discuss this.
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Read October 04, 2009, 10:47:15 AM #18
Ryno

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Re: 10km Above the surface of the Earth!
Any ideas on seperation techniques between the 1st and 2nd stage motors?

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Read October 04, 2009, 01:59:08 PM #19
booster 11

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Re: 10km Above the surface of the Earth!
Stage separation

Stage separation will be done like i did on my two stage flight

as the second stage motor comes up to pressure the first stage will be pushed of with the force of the gasses coming out the motor

if that doesnt work we will have to use a separation charge to separate the two stages

DAVID
we can maybe build the electronics bay first then send it to you so you can start on the electronics for the rocket

lets talk to johann about it and then work from there


....as for the motors we still need two of them ,i think we should go from "N" to "M"
as the "N" will be the 1st stage motor and the "M" the sustainer motor


any one with some other ideas please share

 

South African Doctor Rocket
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Read October 04, 2009, 04:00:27 PM #20
johanngr

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Re: 10km Above the surface of the Earth!
Hi David,

offering an expensive unit for use in an unproven rocket is hardly stingy!

Stage separation will be by drag or the starting of the 2nd stage motor.  A charge is not needed in this design.

We should try to get together to talk about the project.  Who can make it to the 10th of October launch in Sasolburg?

Johann - The Rocket Guy!
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Read October 04, 2009, 05:09:43 PM #21
booster 11

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Re: 10km Above the surface of the Earth!
I have a sutainer fort the 10km my level 3 certification rocket is built to accomodate the 76mm 12-grain "M" class motor

If we only have to build the 1st stage it will save us time and material or just use my payload section on the 10km project

then we only have to build the booster for the 102mm "M" class motor

i think if we go with my complete rocket and just build a booster to accomodate a 102mm "N" class motor we will go to 10km no problem

so please share some ideas
 

South African Doctor Rocket
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Read October 05, 2009, 06:24:45 AM #22
Ryno

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Re: 10km Above the surface of the Earth!
Any ideas on the launch platform?

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Read October 05, 2009, 12:39:06 PM #23
booster 11

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Re: 10km Above the surface of the Earth!
The lauch platform will be the standard platf form if imnot mistaken

or we can use a tower which will elimanate the need for rail guides

lets have a meeting and decide about it

South African Doctor Rocket
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Read October 05, 2009, 02:10:47 PM #24
johanngr

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Re: 10km Above the surface of the Earth!
As far as I know, Louis Louw owns an adjustable launch tower that might be adaquate.  I will ask him about it and report back.


Johann - The Rocket Guy!
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Read October 05, 2009, 02:41:38 PM #25
Ryno

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Re: 10km Above the surface of the Earth!
Sorry if I ask so many questions! Wink
Im just wondering, the 2stage rocket will need a much longer launch rail to make sure it doesn't go of the course, right? Has anyone simulated this type of launch & gained info on how long the rail should be?

I'm wondering how will a platform work that consists out of 4 alluminium square tubing rods that surround the rocket.

OOO, hehe and Johann, what material are you planning on using for the rocket body?(fins aswell)

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Read October 05, 2009, 05:06:09 PM #26
Bryan

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Re: 10km Above the surface of the Earth!
If only I had known sooner. You can count me in for sure. I can help with the motor. Everything except for the motor tube. Actually let me see what I can do. I know someone that has a lathe that can go up to 100mm. Not sure if it will take a 106mm.
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Read October 05, 2009, 05:44:39 PM #27
Bryan

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Re: 10km Above the surface of the Earth!
I can help with a coupler as well. I have already made a 8degree coupler for my two stage. Also works nicely as a boe tail. Here is a picture of the starchaser with the boe tail.
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Read October 05, 2009, 06:48:59 PM #28
johanngr

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Re: 10km Above the surface of the Earth!
Hi Bryan!

Nice Boattail!!

Welcome to the team!


Johann - The Rocket Guy!
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Read October 06, 2009, 05:01:07 PM #29
Bryan

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Re: 10km Above the surface of the Earth!
Hi Johan,

Thank you. Sorry meant to put my name at the end so you know its me. Good one for recognizing my work. Hows this for the Hot J nozzel? Can make something like this for the 10k project.

I have a question for David. You said you are busy with a new altimeter with 3 outputs. Are they fully programable ie. can you program one of the outputs to ignite the second stage when the acceleration stops on the first stage? Also is it possible to do this with v1.2?
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