Skout Had a chance to do some .22 cal EPOCH shot count testing today ...

1.15 fpe/ci

Thank you both for the info.
Does anyone know where 1.15 fpe/ci fits in with similarly powered guns for a reference?

What was your accuracy like, Scott?

When I’ve tested the EPOCH I found they were rather inefficient based on the way they can be tuned (only reg pressure). I don’t have numbers to compare readily available at the moment

broekzwans said:

When I’ve tested the EPOCH I found they were rather inefficient based on the way they can be tuned (only reg pressure). I don’t have numbers to compare readily available at the moment

Click to expand...

Of course, it is ineffective due to the small plenum, especially when you push more power and on larger calibers, let someone prove the opposite...

Airfuture said:

Of course, it is ineffective due to the small plenum, especially when you push more power and on larger calibers, let someone prove the opposite...

Click to expand...

What size do you think the plenum is? Plenum size isn't everything, especially for smaller calibers, since the airway resistance in the barrel is relatively large compared to bigger calibers. Basically the larger your caliber and the larger the need for speed the bigger the plenum needs to be.

The relatively large air consumption is because there is not really a way to decrease the speed on a certain regulator pressure so your always using the highest air consumption. Higher reg pressures give lower air consumption but in the EPOCH that just means the velocity will increase. The impressive thing with the EPOCH though is that they use a large air passage for the valve so they can use very low regulated pressures to achieve relatively high energy.

Here’s how to calculate efficiency.

Take psi of air used and convert that to bar by dividing by 14.5.

Multiply this number by the cubic inches of the airtube or tank. The conversion for cc to ci is 16.39cc per cubic inch.

This gives you the total air available in cubic inches.

Take total air available divided by the fpe. Then take your total number of shots divided by this number to get the efficiency in fpe per cubic inch. The higher the number...the more efficient the rifle is.

Mike

There is also another formula in which the lower the resulting value the more is efficiency.

I will share that as I shall find it.

Yarrah, Harry from Australia advised that to me

Maybe Lloyd still has the stuff that could be re-hosted some where?
I sent him a text message asking him.

mubhaur said:

There is also another formula in which the lower the resulting value the more is efficiency.

I will share that as I shall find it.

Yarrah, Harry from Australia advised that to me

Click to expand...

FPE per cubic inch of air (bigger number is more efficient)
and
bar-cc per FPE (smaller number is more efficient)

I will try to make a calculator with the help of ChatGPT, if someone is more skilled, please help in creating this calculator.

@ Mike
With Lloyds spreadsheet We get 1.53 air efficency in FPE per std ci of air

Privateer said:

@ Mike
With Lloyds spreadsheet We get 1.53 air efficency in FPE per std ci of air

Click to expand...

Is the spreadsheet a secret?

If I remember correctly for that power level that's pretty darn good

Centercut said:

Is the spreadsheet a secret?

Click to expand...

Right now I'm working on getting it back online with Lloyd's full support and also working to turn out an App you can download to a phone. All free in case anyone wonders about that!
The spreadsheet is online but I can't open it as anyone could edit stuff and I can't have that until I get further down the road.

Well Scott, Lloyd said to tell you "WOW!" on that efficiency.