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I apologize for this taking so long, but here is a cross-sectional drawing of the side of the brake. Hopefully this helps :-)
Add Headphone Jack to an iP...View Instructable »
That's a great idea! If I have issues I'll try that.
Nice solution! You're probably right that we could have gotten away with just 1 baseboard. I'll have to keep this in mind for next time.
Good point. Years ago I would use a metal shop-vac to clean up around a CNC router. That thing would throw off 1" arcs! And as much as I would try to keep it away from the router - sometimes it would hit it and knock it offline and I would need to restart it. I'm thinking I won't have a huge issue as the baseboard should be grounded well and the shield is sitting directly on that, but I suppose there is always that potential.
Baseboard Heat Shield / Chimney
Baseboard Heat Shield / Chi...View Instructable »
Haha. Your last comment made me laugh. I think you're probably right on there not being much improvement - and actually I could see the foils slowing it down a bit. I think it would take some tuning to make sure it lifted out of the water, but not too far out of the water at speed.
Yea, I've been thinking of a "fixed" adjustable rudder that would counteract any turning inherent to the boat. Basically a trim adjustment. I never really thought about the function of sailboat rudders that much, but your explanation makes a lot of sense.
Point well taken on the fins. I'm planning on a rudder-type structure back there. I too am hesitant to put the engines up in the air as I know that too much hold-down force is negative as well. We've pushed many boats under the water.
Thanks for all the ideas and that's no problem with the "traffic". I like the catamaran btw. It looks really neat, fun, and fast! I've been a bit hesitant to have the engine adjustable, but you're making me reconsider it. Actually, given all your comments I'm tempted to make a more robust boat that has adjustments all over it for different things - wings, rudders, engine, etc. Then I can really tune things to get it just right. Once again, thanks for all the ideas and we will do this again, but it might have to wait for next year. The lakes will ice over before too long - although that would be another interesting application for a rocket "boat".
Most hobby shops will have rocket engines up to a size E. Stores like Walmart will typically have up to a size C. I purchased size D12-0 like these: http://amzn.to/2eiunwX from a local hobby shop. Have fun! :-)
I'll keep that in mind. It's kinda what I was trying to do on the keels. I just underestimated the density of water.
Thank you! It would be amazing if I could actually get the boat to ride on hydrofoils - and I agree that weight would probably help with getting that setup correctly. I was just thinking of adding foils to keep the boat on the water - an inverted foil, but now you have me thinking about using an actual hydrofoil! Check back in the future to see what I end up doing :-)
Thanks! I had fun doing it. I'm considering wings to help solve the downdraft issue. We'll see how it goes.
I 100% agree with you assessment on the power/weight ratio! I believe the top speed isn't really an issue as this has been solved before in RC boats, etc. It's really that initially high thrust that's probably the most problematic. Crazy story btw. :-)
I imagine there is, but I just bought off-the-shelf Estes rocket engines. Ultimately I would like to make a liquid fueled engine that could be throttled, but that will take a bit of work.
Good idea. I hadn't really considered a horizontal flat plane under the water. That would probably work though as long as it was long enough. Thanks for the idea!
Thanks! The boat itself was pretty inexpensive. I did buy the wood at a hobby shop so it wasn't cheap, but I'd say total wood expenses were probably around $12 or so. The tube was around $4 I think and the aluminum was somewhere around $5. Obviously, you could do it for less with any spare parts you might have lying around. The expensive part is the engines. I used D12-0 engines, which were $11 for a 2-pack - and I used 2 engines for each run. Ideally you could maybe make your own engines - perhaps like this video: https://www.youtube.com/watch?v=12fR9neVnS8 Good luck making!
Haha. Thanks! I've been told this more than once. I was actually debating on how it was pronounced when I put the video together, but I got some poor information from google advising me that it was bass like the instrument.
Great point! My cousin was actually giving me a hard time (sarcastically) because the fins were relatively thick and blunt on the edges. It is a pretty thick (~1/16") aluminum, which does minimize the chances of cutting yourself.
It's not an economical fuel - unless you make your own engines. It's also difficult because the thrust/speed comes on very quickly. With a typical motorized boat you can slowly increase speed and evaluate how the boat is handling. However, with rockets it has to be right on the first go, and that is difficult as evidenced in my video. I would so go ahead and make it, but realize it probably won't be quite as easy as you think, but that's part of the fun of it :-)
Thanks! Comments like this make me want to keep putting in the work to make great Instructables!
That's a good idea! I'm not super familiar with boat design, but don't the steps allow for good stability during turns? It would probably help with going straight too.
Thank you! I'm not 100% sure what you mean by swim time, but I'm guessing maybe you mean engine burn time. I used 2 D12-0 engines, which each have a burn time of 1.6s - resulting in a total burn time of 3.2 seconds.
Thanks! I'm glad to hear you liked it. Have fun making!
Agreed. I wouldn't say it was uncontrollable as long as we had it setup correctly. I just needed more control over the turning.
I could increase total engine burn time to around 4.88 seconds if I used two E12-0 engines instead.
Yea, the footage for the test video was a bit crowdsourced from family and friends. I agree on your assessment of the drag being different in and out of the water. I'll think about your idea for wings - the aerodynamics is an area that does need to be addressed anyways.
I could see this working if the angle of the plane was very shallow. Given the very strong downward force at a moderate angle of my small planes, the connected foil would create much more drag at the same angle. That being said, I could see that a larger foil at a shallow angle might provide more stability with less drag. I drew out what my idea for the foils was. By replacing the flat planes with actual hydrofoils, I should be able to reduce drag while still promoting the necessary downward force.
Thanks! It is fun and it has always been a learning process making these things.
Rocket BoatView Instructable »
Thanks! I'm glad you appreciated it :-)
Thanks! I was hoping it would be even a bit more professional, but it was my first cardboard project so I'm happy with it.
I use a 5V to 120V solid state relay to switch the bulb on and off. The arduino sends a digital signal (5V) to the relay telling it to switch on the 120V side of the relay. Power flows from the outlet (power cord), though the relay, and to the light bulb.
Not a bad idea. Thanks!
That is a really great solution for you problem! I'm sure it was much easier to make than mine :-) We too have a few things to donate from our cupboard.
Haha. I'm glad you like it :-)
Thanks! It is surprisingly sturdy, which is what I was going for. If I had a thicker cardboard I probably could have got away with 1 layer as I'm not sitting on this or anything.
Basically, what I was doing was figuring out how I wanted to organize the stuff in the organizer. I laid everything out on the table and arranged everything into groups. These groups would eventually correspond to the compartments in the finished organizer. The lines I've drawn between the groups are just to show the different groups. Hopefully that helps clear it up a bit.
I'm glad you found it helpful.
I'm glad you like it :-) I did need something more versatile. Still, I had to work it carefully to make sure everything fit.
Cardboard Kitchen Cupboard ...View Instructable »
Thanks! It sounds like your friend needed something a tad more sturdy, which I'm sure it is. Maybe someday I should test the limits of my rig - although I'd hate to have to make it all over again.
Good point. At this point I find that it bends sharp enough for my needs, but I'll keep this in mind.
Great question! I looked through my receipts and the total came to around $33 without the paint.
Thanks! Right now I'm just dreaming of a workbench :-) It's actually my next project on the list.
That's a great idea on the steel plate. That would have been a lot more filing than I wanted to do! Oh to have a grinder...
This was my original thought. For the small hole it would have worked great, but I think I still would have had to drill the 5/16" hole from the outside as the bit would have hit the legs of the angle. Really, I did it the way I did so that I didn't need to clamp the angle upside down.
I almost always use Lowe's. But then again, I can be there in less than 5 minutes.
Thanks! I'm glad you liked it. So far I'm excited that I don't need to use the vice anymore. :-)
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