Why powerful mainsprings don’t always increase velocity

by Tom Gaylord, a.k.a. B.B. Pelletier

Today’s report is the one I mentioned forgetting in last Friday’s blog! Blog reader Errol reminded me about it yesterday.

I hear this so often from airgunners — how they think they’re going to add a more powerful mainspring to their airguns and increase the power. It sounds logical, but it often doesn’t work; and it nearly always doesn’t work as well as you think it should. Today, I want to discuss why that is.

Fact 1
The Weihrauch HW 35 was always considered to be one of the most powerful airguns in its day — which was the 1950s. They delivered over 700 f.p.s. when new in the 1950s; and over time, this rose to 750 f.p.s. Careful tuning could get close to 800 f.p.s. from certain guns. This model is still being made today, but now it sells because it’s so pleasant to shoot and doesn’t produce excessive power. How times change!

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Resizing a mainspring

by B.B. Pelletier

I recently started writing more reports about the fundamental things that many airgunners would like to know. These are things you don’t have to know to shoot an air gun; but if you do know them, they can often help you recognize why your gun does what it does. You also don’t have to know what makes an automobile work; but when it stops working, sometimes knowing how it’s supposed to work can help you find the problem and fix it.

Today, I’m going to show you how a brand new mainspring is set to its operational length before installing it into a spring-piston airgun. It’s not necessary to do this; because, over time, the mainspring will automatically reduce in length after being in the spring gun under some tension and being compressed many times. If you do this first, it makes the job of spring installation easier in some cases.

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The HW 55CM target rifle: Part 4

by B.B. Pelletier

Part 1
Part 2
Part 3


Is this Custom Match the best HW 55 ever made? Read the report to find out.

In the last report, I tuned the rifle and got rid of the objectionable firing cycle. It’s always a great pleasure to return to a classic air rifle like this one after testing so many modern airguns, because these oldies are so reserved and well-behaved. I know it’s not going to kick, roar and fight me at every turn. It may only be suited to shoot 10-meter target, but sometimes — and by that I really mean often — that’s exactly what I need.

Sight-in
I had to remove the sights during the tuneup, so the rifle needed to be sighted-in again. It wasn’t that far off, but the indices are so dark on a 55 rear sight and my eyes are so bad that I had to play around until I discovered which way to adjust the sight to go right. In this respect, a modern 10-meter rifle has it all over a vintage one.

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The HW 55CM target rifle: Part 3

by B.B. Pelletier


Is this Custom Match the best HW 55 ever made? Read the report to find out.

Part 2
Part 1

This is a special Part 3 for the HW 55 Custom Match target rifle. It will be a retest of velocity, following a strip-down and lubrication with black tar to get rid of some uncomfortable vibration when the gun fires. When I tested it for velocity in Part 2, I discovered the rifle was shooting way too fast for an HW 55. Probably the Beeman Company replaced the mainspring when it went back to them for an overhaul. At any rate, when RWS Hobby pellets average 694 f.p.s., as they did for this rifle, you know something is wrong. I’ll try to remove as much of the harshness as I can with this tune, and I really don’t care how much velocity is lost.

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A shrine built for a Feinwerkbau 124 – Part 14

by B.B. Pelletier

Part 13
Part 12
Part 11
Part 10
Part 9
Part 8
Part 7
Part 6
Part 5
Part 4
Part 3
Part 2
Part 1

Airgun Academy videos #19 and #20 are now available.

2011 airgun show calendar
Before I get to the report, here’s a calendar of all the 2011 airgun shows I know of. If you want to go to an airgun show, here they are.

March 5 & 6
Pacific Airgun Expo
Placer County Fairgrounds
Roseville, CA
Contact Jon Brooks @ 707-498-8714
pae@pacificairgunexpo.com

April 9
Flag City Toys That Shoot
Lighthouse Banquet Facility
10055 S.R. 224 West
Findlay, OH 45840
Contacts:
Duane Shaferly @ 419-435-7909
Dave Barchent @ 419-423-0070
Dan Lerma @ 419-422-9121
To register contact:
FlagCityToysThatShoot.com

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A shrine built for a Feinwerkbau 124 – Part 13

by B.B. Pelletier

Part 12
Part 11
Part 10
Part 9
Part 8
Part 7
Part 6
Part 5
Part 4
Part 3
Part 2
Part 1

The November podcast has been posted.

Before we begin, my buddy, Randy Mitchell, who was also the outlaw, Dakota, from Frontier Village (an amusement park in San Jose, California, from 1961-1980) sent me a photo from over 40 years ago. I was Casey Jones, the engineer who ran the railroad at the Village, and Dakota had put an obstruction across the tracks out in the badlands. When I stopped the train, he jumped me at gunpoint and forced me to clear the rails. Then, he stole my boots and drove the train back to the station himself. How time flies!

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