Search found 1053 matches

by hectmarr
Sun Nov 26, 2023 5:08 pm
Forum: General How-To & Discussion
Topic: Fly-K mortar - "captive piston" variation
Replies: 14
Views: 26564

Re: Fly-K mortar - "captive piston" variation

Nice launching system!! The Diesel hammer came to mind. I imagine that it would be impossible due to the weight of the ammunition necessary to achieve the compression necessary to achieve self-ignition of an air-fuel mixture. My inspiring system! ;)
by hectmarr
Sun Nov 26, 2023 4:50 pm
Forum: Hybrid Cannons
Topic: Hybrid geometry
Replies: 7
Views: 6320

Re: Hybrid geometry

An interesting question and I thought worth investigating, so I made the following modifications to the Mini Hybrid II : Blunt endcap insert: 20231123_211452.jpg Insert bore tapered: 20231123_214925.jpg I fired two shots each with both endcap variations, for each shot I used a 63cm long 0.177" barr...
by hectmarr
Thu Nov 16, 2023 3:38 pm
Forum: Hybrid Cannons
Topic: Compression Ignition Hybrid Testbed
Replies: 6
Views: 5075

Re: Compression Ignition Hybrid Testbed

Good point you raise. More travel and more air improves everything here. As for the fuel, I don't think you can use anything that we have at hand, that has a much higher autoignition temperature. What you might think is some "special" ingredient to raise this point. Don't know... :roll: The informat...
by hectmarr
Thu Nov 16, 2023 3:29 pm
Forum: Hybrid Cannons
Topic: Mini Hybrid II
Replies: 11
Views: 28298

Re: Mini Hybrid II

That flash on the first objective was great. :o Good job and an inspiration to many, for sure.
I am compiling these new tests with the pure hybrid, in "Jack's Bible" 8-)
by hectmarr
Tue Nov 14, 2023 1:20 pm
Forum: Hybrid Cannons
Topic: Compression Ignition Hybrid Testbed
Replies: 6
Views: 5075

Re: Compression Ignition Hybrid Testbed

What we need is a fuel with a high autoignition temperature. This is so that the compression of the hybrid chamber is significant and that the fuel does not self-ignite before🤔
by hectmarr
Sun Nov 12, 2023 5:49 pm
Forum: Hybrid Cannons
Topic: Compression Ignition Hybrid Testbed
Replies: 6
Views: 5075

Re: Compression Ignition Hybrid Testbed

Another option to avoid premature ignition could be to use a high-octane fuel, but it would no longer be something you can get anywhere, and at a low price.
Vegetable oil burns very well, but it seems that it is not enough... :(
by hectmarr
Sun Nov 12, 2023 5:44 pm
Forum: Hybrid Cannons
Topic: Compression Ignition Hybrid Testbed
Replies: 6
Views: 5075

Re: Compression Ignition Hybrid Testbed

Excellent post!!! You can see all the experimental work with a single glance!!! It would be interesting for the, engineers the forum to participate, to make Jack and me aware of issues that we could not see... Any idea, concept, information or whatever, would be very welcome for this project. For my...
by hectmarr
Sun Nov 12, 2023 7:46 am
Forum: Hybrid Cannons
Topic: Hybrid disk burst pressure effect on performance
Replies: 20
Views: 29899

Re: Hybrid disk burst pressure effect on performance

Interesting research. Timing is also important, not just accumulating more pressure.
by hectmarr
Tue Nov 22, 2022 8:35 pm
Forum: Hybrid Cannons
Topic: Questions about pressure and flow rate
Replies: 5
Views: 4097

Re: Questions about pressure and flow rate

Assuming that there are two combustion chambers A and B, the volume of A is twice that of B, and the initial pressure of B is twice that of A, then theoretically, A and B should use the same amount of fuel, so their calorific values should be the same. Then the question comes, which one, A and B, c...
by hectmarr
Sat Nov 12, 2022 9:38 am
Forum: Hybrid Cannons
Topic: Is there a more active website than this?
Replies: 8
Views: 5209

Re: Is there a more active website than this?

It is good here. there are few of us who publish but it is all interesting for me. I guess you can continue to share qualitatively, but not quantitatively. ;)
by hectmarr
Fri Nov 11, 2022 10:48 am
Forum: Hybrid Cannons
Topic: Is there a more active website than this?
Replies: 8
Views: 5209

Re: Is there a more active website than this?

I agree with the teacher (Jack). It is useless to try to resist producing holes!! :evil:
by hectmarr
Fri Nov 11, 2022 10:44 am
Forum: Hybrid Cannons
Topic: A brand-new ignition method
Replies: 33
Views: 28647

Re: A brand-new ignition method

You can use my mother-in-law as a target... JOKE! :twisted: What I'm dying to know is if the whole concept will work well. In my opinion YES! she will do it.
by hectmarr
Fri Nov 11, 2022 7:14 am
Forum: Hybrid Cannons
Topic: A brand-new ignition method
Replies: 33
Views: 28647

Re: A brand-new ignition method

I would like to focus the conversation on the possibility of turning on a high pressure chamber with a lower pressure one, which is the subject of your publication. what you explain about increasing the pressure with two connected chambers, I know well, because I have already talked about it here. ...
by hectmarr
Thu Nov 10, 2022 6:49 pm
Forum: Hybrid Cannons
Topic: A brand-new ignition method
Replies: 33
Views: 28647

Re: A brand-new ignition method

I would like to focus the conversation on the possibility of turning on a high pressure chamber with a lower pressure one, which is the subject of your publication. what you explain about increasing the pressure with two connected chambers, I know well, because I have already talked about it here. F...
by hectmarr
Wed Nov 09, 2022 1:27 pm
Forum: Hybrid Cannons
Topic: A brand-new ignition method
Replies: 33
Views: 28647

Re: A brand-new ignition method

check valve and rupture disc You can use. It will be very delicate to only one check valve so that it does not open prematurely... I tried a valve in these conditions and if you adjust it too high, it does not open, and if it is too little, it loses on the side with the highest The less pressure cha...