Jump to content
This site uses cookies! Learn More

This site uses cookies!

You can find a list of those cookies here: mysite.com/cookies

By continuing to use this site, you agree to allow us to store cookies on your computer. :)

Sign in to follow this  
dnl42

LCM3 PA13-2, Operation Overlord

Recommended Posts

I'm building the Hobby Boss 1/48 LCM3 for a GB on another forum. I naively thought it would be a mostly OOB build when I started. But, I soon found myself pondering some of the parts, and that's when OOB left the building.  As such, I thought this would be interesting to show, here, too.

 

Here are the bits from the box

lcm-start2.jpg

lcm-start0.jpg

As you can see, I added Eduard's PE for this kit. At first, this all looked OK. Since I would be building this for Overlord, I knew the Sherman wasn't a possibility, but I figured that a Jeep would be a fine accompaniment for the completed kit.

 

The first steps are the hull. Turns out the very first pause came with the skeg and rudder

lcm-skeg.jpg

The leading edge at the rudder hinge works out to about 4.3 inches thick! Also the rudder won't support any side loads, which I assumed would have been a strong consideration for a beaching boat...

 

My Google-foo soon found an image with the needed detail.

s-FFAnb-W-skeg.jpg

Turns out this enlargement showed an LCM aboard an M25, a.k.a., Dragon Wagon. Hm, if only Tamiya would release one of those in 1/48. But, I digress. Here's what I did to fix the kit.

lcm-newskeg1.jpg

And the shot similar to my enlargement above

lcm-newskeg0.jpg

That looks much better.

Around this time, I found my subject vessel. Woohoo! A source of truth...and more questions...

d03423.jpg

 

Details on LCMs are scant indeed. My best source of info have been videos on YouTube, which showed the next issue. I noticed that when the ramp dropped, there was some activity in that channel at the bow in the photo above. That guide is a C channel with the equalizing sheave shuttling from the aft end of the guide when the ramp is raised--as seen above--to the forward end of the guide when the ramp is lowered. HB was apparently clueless about that, as they just supplied a U channel for the part, with no other connection to the boat beside it being welded to the frames. As for ramp operations, HB guessed there were ramp winches port and starboard, and the cables ran from winch, along the deck to a sheave at the bow, and then up to a sheave at the top of the bow to padeyes on the ramp.

 

Watching more videos and reading the contemporaneous Skill in the Surf: A Landing Boat Manual, led to a better understanding of the mechanism. There's a single ramp winch driven by the port engine, hauling on a cable connected to the eye on equalizing sheave. There's a single ramp cable (wire rope) running from a padeye on the port side of the ramp, over a sheave at the bow, down to a sheave leading into the equalizing sheave guide, around the equalizing sheave, forward to a 2nd sheave at the forward end of the sheave guide, around that sheave and aft above the deck to a sheave that transferred the ramp cable to the starboard side, around a sheave and forward above the deck to a pair of sheaves (bottom and then top) to the other padeye on the starboard side of the ramp. As the name suggests, this arrangement ensures that the tension on both sides of the ramp are equal, ensuring it moves freely. The green line in the image below runs from equalizing sheave to top of the ramp winch cover. The red line shows that port-side ramp cable. The yellow line shows what I believe is the ramp release cable mentioned in Skill in the Surf.

lcm-cables.jpg

 

I first made up a C channel from 2 strips of Evergreen C channel and strip material.

lcm-rampbits0.jpg

Now that I had the equalizing sheave channel, I needed an equalizing sheave.

lcm-rampbits3.jpg

This is a guess--the only part visible is the uppermost rectangular bar, which is what first caught my attention.

 

With an equalizing sheave guide and equalizing sheave in hand, I turned my attention to the ramp sheaves. Here's HB's interpretation.

lcm-rampbits4.jpg

I needed something more like this

lcm-rampbits5.jpg

 

More searching led me to making these bits. The sheaves are disks cut from 0.01 in sheet punched using Waldron #6 and #4 punches. The rest of the bits are also 0.01 sheet.

lcm-sheaveguide0.jpg

 

I used those bits to make these two assemblies.

lcm-sheaveguide4.jpg

 

lcm-sheaveguide5.jpg

 

I first thought the winch cover was thinner than HB's part, so I thinned down the port winch cover. Turns out I was incorrect, and HB got the width about right. But the cable entered the winch cover at the top, not the bottom. I was able to refashion the unneeded starboard winch cover into a better shape. HB's winch drum looked more like a sheave. Also shown is the revised winch drum, which I corrected using my smallest square needle file, along with the mounting plate/box for the drum, which I thinned down considerably.

lcm-rampwinch.jpg

 

Skill in the Surf indicated the LCM carried two 12 foot boat hooks. HB just had some unidentified hooks in the cargo hold. Eduard provided PE replacements for the hooks; they also indicated that plain 1mm rod, 95mm and 60mm long, were to be placed in the hooks. I made up two boat hooks from 0.04 rod, 3 inches long. I tapered the ends and mounted a hook fashioned from 0.026 brass wire into a hole drilled into the tapered end.

lcm-boathook.jpg

 

I'm now working on the 50 cal mounts, shown in the enlargement below.

d03423-50-cal-mounts.jpg

I first noticed that the 50 cal Brownings are not mounted. Harrumph, and I just spent a couple of evenings tarting up the HB Brownings with the Eduard PE and Master barrels. Here's a before and after shot of the HB plastic.

lcm-50cal1.jpg

 

The remaining HB plastic, folded Eduard PE, and the marvelous Master barrels.

lcm-50cal7.jpg

And the assembled 50 cals

lcm-50cal6.jpg

 

Both HB and Eduard provide an armor plate shaped differently than shown in the photo above. This will be easy enough to fix.

lcm-50cal0.jpg

 

The hard bit, where I'm now stuck, is the elevation mechanism. My Google-foo has been unable to find anything like it.

Edited by dnl42

Share this post


Link to post
Share on other sites

Interesting project

 

If you PM me your email address I have some pics of LCM3/Weapons and bow  mechanism that may help . .

 

Kev

Share this post


Link to post
Share on other sites

Another thing I'm looking at is the routing of the ramp cable athwartship. First, what do those on-deck sheaves look like? I've been scouring the interwebs since I started this project early last month.

 

Here's an enlargement that appears to show the protective plate atop the port sheave. It, like other photos I've seen, also suggests the cable doesn't cross athwartship within the engine compartment, as I had previously thought.

lcm-cable-decksheave.jpg

 

Here's another enlargement that might show the cable crossing within the cargo compartment. If it is, is that the cable per se or some protective "conduit"?  Also, there's a shadow on the starboard side where the apparent cable would intersect the coaming. I wonder if that shadow is some interior part of the sheave?

lcm-cable-athwartship.jpg

BTW, this also shows the cable run from the equalizing sheave and the ramp winch, which is at the very right edge of the image.

 

Opinions are welcome! Photos or drawings supporting or contradicting this are most prized!

3 hours ago, longshanks said:

Interesting project

 

If you PM me your email address I have some pics of LCM3/Weapons and bow  mechanism that may help . .

 

Kev

Oustanding stuff! Thanks!!!

Share this post


Link to post
Share on other sites

I'm not sure but I get the impression from the pics you posted that the HB kit is a copy of the 1/35  Trumpeter one. If so, a lot of work is involved to correct the mistakes (mostly dimensional errors):

 

https://www.perthmilitarymodelling.com/reviews/vehicles/misc/lcm3/lcm3.htm

 

A pic you probably have already :

 

91aqfUp.jpg

 

I posted some pics that might be useful here :

 

http://www.twenot-forums.nl/viewtopic.php?f=14&t=34190&sid=feed1603c492d4fe7b7055349d953fc7

 

Regards,

 

Arjan

Share this post


Link to post
Share on other sites

Found similar to Arjan, may help sorting you out

https://www.onthewaymodels.com/reviews/Trumpeter/AlMagnus_Trumpeter_LCM(3)_review.htm

 

The article I was referring to before I think was a build in the Tamiya Magazine. The guy even oil canned the sides. I don't have TM but perhaps someone out there can help

 

Kev

Share this post


Link to post
Share on other sites

@Arjan, I'm certain the HB kit is a copy of the Trumpeter kit. Thanks for the pix, there are photos I hadn't seen before. The 1st photo in this post of yours(?) show that artifact that is at least consistent with the ramp cable run. One additional bit of information I gleaned from the photo above is the demarcation between the cargo compartment coaming and the deck over the engine compartment. The coaming appears to end right at the forward edge of the engine compartment. That strengthens my supposition about the cable routing. But, I'm still not ready to commit on the ramp cable routing athwartship. I also see what I appears to be the protective plate over that deck sheave; it's more sensibly shaped than another photo I have. That different shape may be some change order that came along or another difference between an LCM built in Higgins v. Boston Navy Yard. FWIW, PA13-2 isn't quite consistent with the photos cited as being from BNY.

91aqf-Up-crop1.jpg

 

@longshanks. I saw that review, which found and corrected HB's mistakes that I've tripped up on too. Once you start looking at online photos, you start wondering what Trumpeter/HobbyBoss were thinking.

 

Sigh... the quest continues...

Share this post


Link to post
Share on other sites

Some more pics :

 

tycRpHD.jpg

uvvyp6g.jpg

LShmWNI.jpg

kbjw2XL.jpg

6FLo5uU.jpg

2gP51GZ.jpg

7LWue9r.jpg

 

Good luck !

 

edit:  the fourth pic clearly shows the ramp cable inside the cargo compartment.

 

Arjan

Edited by Arjan

Share this post


Link to post
Share on other sites
5 hours ago, Arjan said:

Some more pics :

...

kbjw2XL.jpg

...

 

edit:  the fourth pic clearly shows the ramp cable inside the cargo compartment.

 

Arjan

Bravo! :worthy:

 

The exact image I needed!!! It clearly shows the cable and some eyes to guide it. I'm also going to declare the deck sheave and protective plates do pierce the coaming. Finally, there are other gems in that picture, such as protective guards around the wing tank manhole covers, a port-side engine compartment vent, the portable bilge pump referred to by Skill in the Surf, additional confirmation of the placement and appearance of light-colored (white?) life preservers.

Edited by dnl42
Ah, HB did get those guards around the manhole covers...

Share this post


Link to post
Share on other sites

Thanks @longshanks and @Arjan ! You've cleared up my 2 major questions about the 50 cal mounts and the ramp cable arrangement!!!

Share this post


Link to post
Share on other sites

Made progress on the ramp cable in the cargo hold.

 

I first removed HB's misplaced and slightly misshaped engine compartment vent, and built two new vents. HB's is on the left; it's a simple quarter-round. My versions are on the right. They have a quarter-round top part made from a quartered section of 3/16 tube with ends made from a 0.01 disc. The bottom parts are 0.06x0.06 strip.

lcm-rampcable0.jpg

 

To allow the cable to pass through the cargo hold, I cut 2 slots in the coaming, sized for the deck sheaves to partially sit in the slot. Arjan's photo also shows 2 guide eyes on the engine compartment bulkhead. I fashioned those from 0.01 brass rod. 

lcm-rampcable1.jpg

 

Another photo from Arjan above suggests a triangular protective plate above the deck sheaves. I made those from 0.01 sheet.

lcm-rampcable3.jpg

Share this post


Link to post
Share on other sites

Worked on the hull discharges. You can see 3 discharges on the port side in my reference photo. Here are enlargements of the exhaust from my reference and another photo
d03423-exhaust.jpg gettyimages-50488369-exhaust.jpg

 

And here's an enlargement of the ramp winch cover. There appears to be a rolled edge around the periphery of the winch cover--I assume to provide rigidity to the sheet  metal

gettyimages-50488369-winchcover.jpg

 

I replicated the rolled edge using stretched sprue. I fabricated the hull discharges using 1.1, 1.5, and  2mm Albion brass tubing. The manifold around the exhaust is my 2nd attempt.

lcm-openings-winch1.jpg

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×