Welcome to the Water Rocket Forum, sponsored by The Water Rocket Achievement World Record Association.

The largest, most sophisticated and ground breaking group supporting you, the serious water rocket flyer! Whether you are a beginner or an expert, the WRA2 has something for everyone.

A water rocket is a type of model rocket using water as its reaction mass. The pressure vessel (the engine of the rocket) is constructed from thin plastic or other non metallic materials (usually a used plastic soft drink bottle) weighing 1,500 grams or less. The water is forced out by compressed air. It is an example of Newton's third law of motion.

Completed Servo Chron Bay

Discussion about deployment systems including altimeters, timers, air speed flaps, servo systems, and chemical reactions.
Post Reply
User avatar
Water Rocket Expert
WRA2 Member
WRA2 Member
Posts: 622
Joined: Fri Nov 22, 2013 10:39 am

Completed Servo Chron Bay

Post by Water Rocket Expert » Thu Feb 27, 2014 9:44 am

I finally got my ServoChron to work. The first time I programmed it two weeks ago, I didn't know exactly how I did it so it could be done agian. Last night I accidentally deleted it from memory but got it working against just like before. I have placed my board, servo, altimeter, batteries which I know I kind of heavy right now, and I will soon try to put a camera in there. Here is my demonstration. Tell me what you think. This is for the axial deployment system.
You do not have the required permissions to view the files attached to this post.


Water Rocket Expert
I'm 20
Maryland
"Anyone who has never made a mistake has never tried anything new." -Albert Einstein

User avatar
Water Rocket Expert
WRA2 Member
WRA2 Member
Posts: 622
Joined: Fri Nov 22, 2013 10:39 am

Re: Completed Servo Chron Bay

Post by Water Rocket Expert » Thu Feb 27, 2014 11:11 am

I got it rigged to my parachute now so I'm hoping today I can get a launch in with a 1.5 liter bottle rocket and a 2 second delay. Does that delay sound good?


Water Rocket Expert
I'm 20
Maryland
"Anyone who has never made a mistake has never tried anything new." -Albert Einstein

User avatar
bugwubber
WRA2 Member
WRA2 Member
Posts: 1087
Joined: Wed Dec 19, 2012 2:47 am

Re: Completed Servo Chron Bay

Post by bugwubber » Thu Feb 27, 2014 11:19 am

Great! can't wait to see it in action. how much pressure are you going to launch with? At 60psi, ballistic flights don't last more than 3 sec.


Bugwubber

Team S.P.E.W.

User avatar
Water Rocket Expert
WRA2 Member
WRA2 Member
Posts: 622
Joined: Fri Nov 22, 2013 10:39 am

Re: Completed Servo Chron Bay

Post by Water Rocket Expert » Thu Feb 27, 2014 11:24 am

So is a 2 second delay good or 1 second.


Water Rocket Expert
I'm 20
Maryland
"Anyone who has never made a mistake has never tried anything new." -Albert Einstein

User avatar
Water Rocket Expert
WRA2 Member
WRA2 Member
Posts: 622
Joined: Fri Nov 22, 2013 10:39 am

Re: Completed Servo Chron Bay

Post by Water Rocket Expert » Thu Feb 27, 2014 11:25 am

I was thinking like 100 psi. My launcher clamp broke but I can still launch until fixed by tossing a small brick at the launcher base which causes it to launch.


Water Rocket Expert
I'm 20
Maryland
"Anyone who has never made a mistake has never tried anything new." -Albert Einstein

User avatar
bugwubber
WRA2 Member
WRA2 Member
Posts: 1087
Joined: Wed Dec 19, 2012 2:47 am

Re: Completed Servo Chron Bay

Post by bugwubber » Thu Feb 27, 2014 1:03 pm

Water Rocket Expert wrote:I was thinking like 100 psi. My launcher clamp broke but I can still launch until fixed by tossing a small brick at the launcher base which causes it to launch.
Brick Assisted Launch. That's a new one!

Just a suggestion- get your launcher fixed!


Bugwubber

Team S.P.E.W.

User avatar
Spaceman Spiff
WRA2 Member
WRA2 Member
Posts: 681
Joined: Sat Feb 24, 2007 11:06 am

Re: Completed Servo Chron Bay

Post by Spaceman Spiff » Thu Feb 27, 2014 1:48 pm

bugwubber wrote:Great! can't wait to see it in action. how much pressure are you going to launch with? At 60psi, ballistic flights don't last more than 3 sec.
With the heavy batteries and payload, it might go higher than you think. I would urge him to run it through a simulator to figure out the correct timing. An early deploy can be as bad as no deploy at all.


Spaceman Spiff
"What goes up, must come down"

User avatar
Water Rocket Expert
WRA2 Member
WRA2 Member
Posts: 622
Joined: Fri Nov 22, 2013 10:39 am

Re: Completed Servo Chron Bay

Post by Water Rocket Expert » Thu Feb 27, 2014 3:02 pm

I'll run it through the Clifford health sim.


Water Rocket Expert
I'm 20
Maryland
"Anyone who has never made a mistake has never tried anything new." -Albert Einstein

User avatar
Water Rocket Expert
WRA2 Member
WRA2 Member
Posts: 622
Joined: Fri Nov 22, 2013 10:39 am

Re: Completed Servo Chron Bay

Post by Water Rocket Expert » Thu Feb 27, 2014 3:20 pm

the are the results,

Coast

Drag-free coast 274.0 metres to apogee at 274.5 metres after 7.5 seconds
Actual apogee at 68.03 metres (223.2 feet) after 3.08 seconds

So I'll set the delay for 2 seconds because I don't think it calculates the time the parachute takes to unwind.


Water Rocket Expert
I'm 20
Maryland
"Anyone who has never made a mistake has never tried anything new." -Albert Einstein

User avatar
Water Rocket Expert
WRA2 Member
WRA2 Member
Posts: 622
Joined: Fri Nov 22, 2013 10:39 am

Re: Completed Servo Chron Bay

Post by Water Rocket Expert » Thu Feb 27, 2014 3:22 pm

the split collar will take about 3 days to dry with the PL so it won't be fixed today. I may not launch today, because the launch to needs a replacement elbow that I don't have lying around. Besides it's a bit windy here.


Water Rocket Expert
I'm 20
Maryland
"Anyone who has never made a mistake has never tried anything new." -Albert Einstein

User avatar
bugwubber
WRA2 Member
WRA2 Member
Posts: 1087
Joined: Wed Dec 19, 2012 2:47 am

Re: Completed Servo Chron Bay

Post by bugwubber » Thu Feb 27, 2014 4:28 pm

Water Rocket Expert wrote:the split collar will take about 3 days to dry with the PL so it won't be fixed today. I may not launch today, because the launch to needs a replacement elbow that I don't have lying around. Besides it's a bit windy here.
What are you gluing on the split collar?

All Purpose (PVC, CPVC, ABS) Cement is what I use on pipe.

I finally made my first gardena launcher. Used wire and JBWeld Putty to attach PVC pull down rings. Set and ready to go in 1 day.


Bugwubber

Team S.P.E.W.

User avatar
Water Rocket Expert
WRA2 Member
WRA2 Member
Posts: 622
Joined: Fri Nov 22, 2013 10:39 am

Re: Completed Servo Chron Bay

Post by Water Rocket Expert » Thu Feb 27, 2014 4:38 pm

I am using PVC glue for gluing the PVC, but I now am gluing the PVC couplings sides to the metal vice, which does not adhere to PVC using PVC glue. So I am using PL Premium. It dries a bit faster when it is not in an air tight environment like a splice. They fell off from me throwing bricks at it.b WA:


Water Rocket Expert
I'm 20
Maryland
"Anyone who has never made a mistake has never tried anything new." -Albert Einstein

User avatar
Water Rocket Expert
WRA2 Member
WRA2 Member
Posts: 622
Joined: Fri Nov 22, 2013 10:39 am

Re: Completed Servo Chron Bay

Post by Water Rocket Expert » Thu Feb 27, 2014 4:39 pm

What kind of JB Weld Putty did you use. Steel Stick, plastic weld, water weld?


Water Rocket Expert
I'm 20
Maryland
"Anyone who has never made a mistake has never tried anything new." -Albert Einstein

User avatar
bugwubber
WRA2 Member
WRA2 Member
Posts: 1087
Joined: Wed Dec 19, 2012 2:47 am

Re: Completed Servo Chron Bay

Post by bugwubber » Thu Feb 27, 2014 5:30 pm

Water Rocket Expert wrote:What kind of JB Weld Putty did you use. Steel Stick, plastic weld, water weld?
I have both but Steel Stick for this since I used it to cover up the wire. Also added some filets of putty under the pvc rings to hold them in place really well.


Bugwubber

Team S.P.E.W.

User avatar
bugwubber
WRA2 Member
WRA2 Member
Posts: 1087
Joined: Wed Dec 19, 2012 2:47 am

Re: Completed Servo Chron Bay

Post by bugwubber » Thu Feb 27, 2014 5:34 pm

Water Rocket Expert wrote:the are the results,

Coast

Drag-free coast 274.0 metres to apogee at 274.5 metres after 7.5 seconds
Actual apogee at 68.03 metres (223.2 feet) after 3.08 seconds

So I'll set the delay for 2 seconds because I don't think it calculates the time the parachute takes to unwind.
2 sec sounds good. I was just looking over my 2 liter/100psi altimeter chart, it hit right at 2sec to apogee.


Bugwubber

Team S.P.E.W.

Post Reply