Aerospike 300 BLK 146 Lulu adventure begins

[HappyHellfire]

Here's a simple yet incredibly important business lesson for you: the customer may not be right, but they're never wrong. Everyone you're talking to on this forum is a potential customer.

Dellet is being measured and patient. If the critiques bother you that much, you'll need to grow a thicker skin if you want to get anywhere.

Dellet is doing a wonderful job of being unbiased and critical. (And I mean critical in the most positive way). His criticism is why I'm putting up with the rest.

Unfortunately, I have to disagree on the business advice. I get the feeling that a lot of posters on here are small business owners of gun shops, pawn shops, and gun smith services I understand your outlook but I am not a businessman. I am a researcher. Agreeing with an ignorant customer to close a sale may make a successful business but it is not how we increase knowledge or reduce ignorance.

Don't worry, I'll eventually partner with a real businessman who will take away my social media accounts and sell bullets.

 

[dellet]

View attachment 1575656
View attachment 1575657
View attachment 1575658

Do we have any test data yet? How they shoot?

Don’t tease the poor young man with stills when he can have video

 

[HappyHellfire]

Don’t tease the poor young man with stills when he can have video

How old do y'all think I am?

 

[HappyHellfire]

Schlieren photography - Wikipedia

en.wikipedia.org

This is actually pretty old technology. Still cool.

 

[wwbrown]

How old do y'all think I am?

Should we base this on your sulking behavior? Example: claiming you won't sell bullets to someone who made you butthurt.

Most people grow out of some of the behaviors you have exhibited and that may influence people's estimate of your age. The old saying actions speak louder than words may apply in this situation.

Remember the first rule of holes, when in one put the shovel down do not reach for a bigger shovel.

 

[dryhumor]

Now your just teasing me! I love these images.

The top one is how yaw inducing devices work. I have a couple of students who will be working on designing one form me this year. The shockwaves bouncing off the wall and bullet (left picture) creates a strong pressure force on the base that increases the angle of attack. Not useful in practice but very useful if you want to measure the epicyclic motion with cameras or radar.

Notice the bottom images (CFD-Computational Fluid Dynamics) do not catch the swirling twirling turbulence behind the bullet. That is one of the reasons I have a difficult time using CFD with my bullets. The CFD doesn't catch the turbulence very well and my bullets work by reducing the turbulence.

Thus I'm mostly using live fire data to design my bullets.

IIRC, that bottom pic concerned the gas flow through a barrel, as the ignition of the powder and expanding gas pushes the projectile forward. Been awhile, so I might be not 100% correct, as I didn’t bookmark the article.

This might be a good example of the CFD you mentioned.

 

[HappyHellfire]

Should we base this on your sulking behavior? Example: claiming you won't sell bullets to someone who made you butthurt.

Most people grow out of some of the behaviors you have exhibited and that may influence people's estimate of your age. The old saying actions speak louder than words may apply in this situation.

Remember the first rule of holes, when in one put the shovel down do not reach for a bigger shovel.

Oh just piss off

 

[HappyHellfire]

IIRC, that bottom pic concerned the gas flow through a barrel, as the ignition of the powder and expanding gas pushes the projectile forward. Been awhile, so I might be not 100% correct, as I didn’t bookmark the article.

This might be a good example of the CFD you mentioned.
View attachment 1575698

That is a real bullet image. The CFD is the computer simulation that try to approximate it. CFD is cool in concept but in practice it does a really poor job of modeling real bullets because of that turbulence issue.

This is a CFD image of the first aerospike that I got working in real testing.

 

[WSnyder]

Should we

No, you should stop. This is a waste of bandwidth, it adds nothing to and only detracts from the topic being discussed.

 

[dellet]

How old do y'all think I am?

Old enough to step on your own dick.

Young enough to get rattled when someone you don’t know points it out.




Brings up a question about something I said earlier concerning to roundness of bullets. Were you familiar with the Whitworth rifle, considered the most accurate long range rifle of its day and prized by snipers of the time?

If not, a quick search might surprise you.

 

[dryhumor]

That is a real bullet image. The CFD is the computer simulation that try to approximate it. CFD is cool in concept but in practice it does a really poor job of modeling real bullets because of that turbulence issue.

This is a CFD image of the first aerospike that I got working in real testing.

View attachment 1575699

Ahh.

Just curious about the spike. Seems that immediately behind a bullet in flight there would be more negative pressure than positive pressure. Many views of bullets in flight are clearly flat base, boat tails, or rebated boat tails. The uniformity of the bases typically shows pretty consistent turbulence swirl behind the bullet in flight. How would the spike affect the bullet in flight?

The only bullet I know of with what might be designed with a sort of spike is the Lapua lock base. I’ve never seen film or video of one in flight. Those being jacketed, with a very small, exposed lead core in the base, would lead me to speculate that the opening allows for core movement during bore compression to gain concentricity. Just speculating.

 

[HappyHellfire]

Old enough to step on your own dick.

Young enough to get rattled when someone you don’t know points it out.




Brings up a question about something I said earlier concerning to roundness of bullets. Were you familiar with the Whitworth rifle, considered the most accurate long range rifle of its day and prized by snipers of the time?

If not, a quick search might surprise you.

I'm familiar with the Whitworth rifle in historical context only. Any good books on it? I read the wiki page but it doesn't seem to tell the whole story.

 

[HappyHellfire]

Ahh.

Just curious about the spike. Seems that immediately behind a bullet in flight there would be more negative pressure than positive pressure. Many views of bullets in flight are clearly flat base, boat tails, or rebated boat tails. The uniformity of the bases typically shows pretty consistent turbulence swirl behind the bullet in flight. How would the spike affect the bullet in flight?

The only bullet I know of with what might be designed with a sort of spike is the Lapua lock base. I’ve never seen film or video of one in flight. Those being jacketed, with a very small, exposed lead core in the base, would lead me to speculate that the opening allows for core movement during bore compression to gain concentricity. Just speculating.

It is a goal of mine to get some shadow graph imagery of an aerospike in flight. The drag curve is conclusive proof of the reduction in base drag due to the shape but it would be so cool to see it visually. I would expect to see much less turbulence when the aerospike engages.

I have a short write up on my website that explains how the aerospike works if you are interested.

 

[wwbrown]

Oh just piss off

Need I say more! Not even sporting anymore.

Maybe you could address some of the academic deficiencies identified in an earlier post?? Surely an accomplished researcher like yourself (at least you make the claim, but proof is in the pudding) has dealt with people who are not fully in lockstep with your ideas. I imagine if you respond in the same fashion to your peers who may not be in full lockstep with you as you treat folks on this forum the results were not good.

Have you never had your work peer reviewed where at least some aspect of your work was shat upon? When crapped upon by your peers did you throw a tantrum threatening to take your toys and go home, if so the paper(s) probably never got published?

When you come here you are addressing people, while asking the same for uncompensated help, who have decades of experience working to shoot more accurately and precisely and have achieved greatness while competing with their peers. In the area of precision shooting (the act not the sims) you are not a peer of the highly seasoned shooters on this forum, you have far less experience as stated by yourself, so maybe you should listen to the experts. There are fields where a PhD doesn't grant you immediate respect, this is one of those fields. A wall full of medals, plaques and trophies is the sign of great knowledge and ability in the shooting sports and the means of earning the respect of your peers.

Have a good AM,
wade

 

[HappyHellfire]

Need I say more! Not even sporting anymore.

Maybe you could address some of the academic deficiencies identified in an earlier post?? Surely an accomplished researcher like yourself (at least you make the claim, but proof is in the pudding) has dealt with people who are not fully in lockstep with your ideas. I imagine if you respond in the same fashion to your peers who may not be in full lockstep with you as you treat folks on this forum the results were not good.

Have you never had your work peer reviewed where at least some aspect of your work was shat upon? When crapped upon by your peers did you throw a tantrum threatening to take your toys and go home, if so the paper(s) probably never got published?

When you come here you are addressing people, while asking the same for uncompensated help, who have decades of experience working to shoot more accurately and precisely and have achieved greatness while competing with their peers. In the area of precision shooting (the act not the sims) you are not a peer of the highly seasoned shooters on this forum, you have far less experience as stated by yourself, so maybe you should listen to the experts. There are fields where a PhD doesn't grant you immediate respect, this is one of those fields. A wall full of medals, plaques and trophies is the sign of great knowledge and ability in the shooting sports and the means of earning the respect of your peers.

Have a good AM,
wade

again, piss off

 

[dellet]

I'm familiar with the Whitworth rifle in historical context only. Any good books on it? I read the wiki page but it doesn't seem to tell the whole story.

This might get you started, a short article with plenty of links and bibliography. David Marshal pops up on many antique and military forums.

Main thing is that round is over rated, but the cost of any other shape to be consistent is staggering. A hexagon bullet and no real rifling, only a twisted bore, is one of things that make you Hmmmm.

It does need to seal the bore, that was my point at the time.

The Whitworth Rifle: A Brief Introduction – Research Press

researchpress.uk

Hex Bore – The Whitworth Research Project – Research Press

researchpress.uk

Link added

 

[wwbrown]

again, piss off

Try that attitude with your tenure review committee, oops as a lecturer I imagine that is not an issue for you.

 

[HappyHellfire]

Try that attitude with your tenure review committee, oops as a lecturer I imagine that is not an issue for you.

Just promoted! Hence the grant. Keep trying or just you know, piss off.

 

[wwbrown]

Just promoted! Hence the grant. Keep trying or just you know, piss off.

Congratulations, what Tier is the University??

Maybe you could display the body of work (papers) that got you promoted, I imagine you must of had the CV to deserve the promotion. Be proud of your demonstrated academic achievements, don't be shy, please share them with the great unwashed here on 6mmBR.

 

[jimmymac]

This is a three ring circus. When does the theory end and actual shooting begin?

This guy comes in here and immediately alienates himself from the very people he is trying to get help from. He has been abrasive, rude and condescending. Whatever shit has been shoveled his way is due to the above.