Water Rocket Car MkXI - Onboard Camera + 474ft team record
Posted: Mon Aug 02, 2010 8:23 am
In quite blustery conditions we had a launch day on the weekend. Lucky for us we can launch in conditions that leave most rocketeers grounded Since the last test we have discarded the low friction rear wheels and returned to the standard wheels. We have fitted a camera, an old 3 Mpixel one we had lying around, it didnt matter if it crashed and was wrecked. We also tried out the mist attachment for the first time in the horizontal position.
The video explains most of it, so here it is
[youtube][/youtube]
We were quite happy with the distances we achieved and beat our previous record of 110m (330ft) by a long way. The 120psi launch could still have gone further except we ran out of road. There was a bit of wind but Im very confident we could achieve that distance on a still day as well. The road is very flat and mostly smooth except for a few rocks which we hit towards the end of the run.
If you watch the video during the main part of the run its interesting to see that the smallest steering input causes a big move in the cars direction. I think we are getting better at steering it, too many quick corrections tends to make it fishtail. Its better to make a steering input, let it settle, then make another one, let it settle etc, which is what we did on these launches. Also towards the end of the second run you can see two bigger steering corrections, this was to try not to hit the gutter straight on. That was at about 130m away, the r/c worked flawlessly even at that distance.
The mist attachment didnt work as well as we had hoped. It did provide a good mist plume but too much water was left in the bottles (about 500ml left out of 1.5L). We will make a type of pickup for the middle bottle to try to solve this problem. The foam + mist attachment was a little better but still too much was left in the bottles at the end of the run.
The camera even though its heavy, worked well. We will probably replace this with a lighter model in the near future.
All in all a good day, we managed to bring the car home in one piece, we found a new launch site and mark enjoyed chasing the water rocket car in his wheelie shoes to turn the onboard camera off.
There is a little more detail on our website for those interested
cya
-todd-
The video explains most of it, so here it is
[youtube][/youtube]
We were quite happy with the distances we achieved and beat our previous record of 110m (330ft) by a long way. The 120psi launch could still have gone further except we ran out of road. There was a bit of wind but Im very confident we could achieve that distance on a still day as well. The road is very flat and mostly smooth except for a few rocks which we hit towards the end of the run.
If you watch the video during the main part of the run its interesting to see that the smallest steering input causes a big move in the cars direction. I think we are getting better at steering it, too many quick corrections tends to make it fishtail. Its better to make a steering input, let it settle, then make another one, let it settle etc, which is what we did on these launches. Also towards the end of the second run you can see two bigger steering corrections, this was to try not to hit the gutter straight on. That was at about 130m away, the r/c worked flawlessly even at that distance.
The mist attachment didnt work as well as we had hoped. It did provide a good mist plume but too much water was left in the bottles (about 500ml left out of 1.5L). We will make a type of pickup for the middle bottle to try to solve this problem. The foam + mist attachment was a little better but still too much was left in the bottles at the end of the run.
The camera even though its heavy, worked well. We will probably replace this with a lighter model in the near future.
All in all a good day, we managed to bring the car home in one piece, we found a new launch site and mark enjoyed chasing the water rocket car in his wheelie shoes to turn the onboard camera off.
There is a little more detail on our website for those interested
cya
-todd-