Weapons

Strike Models Big Guns Cannon 2011

IMG_8934.JPGA couple of months ago Stephen from Strike Models sent me a new variant of the negative pressure cannon I reviewed after NABGO last summer. This time the cannon was in good working order so I was able to spend a good chunk of a day experimenting with it in the live fire cabinet. This review is shorter than the previous review because I don't really see a need to document a complete tear down of the cannon - it is basically the same cannon with a few small tweaks. However, I will describe what I liked, what I didn't, and include a few pictures to illustrate new points.

I also briefly introduce the new adjustable regulator that Strike Models plans to offer in 2012.

New Strike Models Cannon

IMG_7619.JPGStephen had left it with the NTBG guys after NABGO and asked them to mail it to me when they finished. They sent it to me about two weeks after NABCO but I didn't get time to unpack it until I was getting ready for last weekend's target practice.(I've been little distracted this summer)

Before you read this review you should at least skim through the review of the previous Strike Model's design. My comparisons of the two cannons will make more sense if you have read the earlier review.

July After Action Report

Mo at Alta-Mons

On July 16th, USS Missouri set out to engage all opponents upon the Alta Mons Sea. A Reconnaissance Report indicated a substantial minefield (moss) that would restrict Missouri's operational area. While no hostiles were encountered, the day did not proceed without incident.

Missouri was testing out her new more redundant propulsion system, which worked with mixed results: Her starboard engines ran without problem or failure the entire day - marking her first meet that she did not require some form of recovery. Unfortunately, the port motor kept blowing fuses (and still is even on the bench a week later - there is some weird ground short which even took out my multimeter fuse this evening, putting debugging on hold until morning).

Rounding Back of Turrets

IMG_7040.JPGI finally got around to cutting all of the extra material off of the backs of the barrel bends. I took some friendly ribbing at last month's meet when someone observed that the manufacturing marks read as '666' on the back of one of the turrets. What can I say? Nassau is a beast of a boat?

The process is not rocket science - actually it is an old wood working technique.

Tweaks and Upgrades

So, I had a horridly busy week, and was exhausted come the weekend. However, I DID get some time to work on Mo, including replacing the old toggle-switch throttle with a new waterproof ESC (and figured out how to use it)... I still need to put a proper fuse-bank in on it, but that shouldn't take me long this week. I also got A turret re-mounted to the rotation bracket, so everything looks to be shaping up into good form for the target practice this weekend. Now, if only I can survive this week of awesomeness...

New Gun Mount and Rudder Control

CIMG1343.JPGFirst, here is a picture of the new rudder control arrangement. I disassembled everything and added a spacer tube to go between the 1/8" shaft and the hull penetration tube so things operate much more smoothly.  I also put a stainless steel washer at the bottom so that the hull tubes wouldn't dig into the resin of the rudders.  Then, I filed small flats onto the rudder shafts for the set screws to grab.  This provides both a positive grip for the control horns and makes assembly adjusments a non-issue since the screw will force the horn to center on the flat.  I also decided to use ball links for the rudder linkage.  I used some threaded rod (2-56 I believe but I prefer 4-40), Align Trex 600 balls and Quick UK Rocket links.  The Q-UK links are just the nicest I've found and I highly recommend them.  They also come in a variety of colors. 

All in all, it doesn't look all that different but it operates 1000x better than it did.

Turret Rotation for Missouri

A and B rotationSo, this week I finally got a working mount for the rotation servo for the re-worked turret mounting for Missouri.

Missouri's turrets are a very odd design (only a handful of this type of turret were ever made), and getting them to rotate reliably has been an epic campaign.

 

Ammo Magazine Covers

IMG_6251.JPGI spent the afternoon finishing up the magazines and associated hardware (barrel risers, feed tubes, bottoms of barrel bends). Because of the difficulty in making discs in Lexan I drilled all the holes for the magazine covers using a rotary table. This post shows what I did.

Lexan Discs

IMG_6228.JPGAfter some trial and error I finally found a way to reliably cut Lexan discs on a hole saw. So I finally have the raw disks for Nassau's magazine covers. The trick is to use a block of wood to both guide the hole saw and clamp the Lexan. This keeps the hole saw from shaking on the mandrel and very securely clamps the Lexan in place. The other thing is to not try and do this on a $40 Harbor Freight drill press... its spindle and chuck simply can't handle the torque needed. So I did all the drilling on the mill with the gear box dropped into low.

Barrel Bend Bodies - Part 1

IMG_6221.JPGThis weekend I knocked out some of the remaining high precision pieces for Nassau's cannons: the machined barrel bends. Nassau's small size and my insistence on keeping things as close to scale as possible required something with a tighter bend than transitional barrels. Last year I experimented with other ways to support depression using machined barrel bends. Experimentation showed that the machine bends were at least as efficient as traditional barrels. So this weekend I started making the parts to be installed in Nassau.