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>> Home > Boat Building Blogs > 20th Scale ELCO 80ft PT boat part 1
>> Permalink
20th Scale ELCO 80ft PT boat part 1 Print Booklet
Author: CB90   Posts: 14   Photos: 63   Subscribers: 3   Views: 1867   Responses: 26   |   Most recent posts shown first   (Show oldest first)

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Part1 research information - Posted: 1st Aug 2018
From the construction hand book:-
Decking shall be single layer of mahogany plywood, approximately 9/16 inch thick, installed in general accordance with plan, BuShips No. PT486-S1106-411193, subject to development of satisfactory material.
Note. I have seen photos of some perhaps later ELCO 80s with planked decks.

62 degrees hull planking angle not 45 degrees as many have used.
stern transom at 12 degree angle approximately.

Prop shafts of real boat.
All three propellers turned in the same direction clockwise looking from rear, not the greatest configuration for a model boat.
propshaft angles are around 10 degrees.
The centre shaft is at a larger angle to the side ones.
The centre prop shaft angle is 11 degrees and the wing prop shafts are 9 degrees.
Using these angles may restrict your propeller selection.

The centre shaft appears from hull further aft than the side shafts but the propellers are all at the same distance from the stern or transom.

Attached Photos - Click To View Large
20th Scale ELCO 80ft PT boat part 3 - Posted: 29th Jul 2018
Have been soaking the 6mm square sectioned stringers in the bath for a length of time, over night in cold water or 2 hrs in hot water seems to do the trick.

Put stringers in place held by plastic ties or string until dry (24hrs) then remove and refit with glue and the plastic ties to hold in place.

Please note, don't glue a wet/damp timber as it will shrink as it dries and pull the boat out of alignment.

The blocks at aft are for the three propeller shafts, will be shaped (one has in a later photo) to hull profile. The wood is a very light like Obechi.

Please note. The Models main priority apart from cheapness is to produce a light weight hull that is large enough not to disappear on a pond but light enough for me to carry to a pond/lake as my back is not what it used to be.

Attached Photos - Click To View Large
20th Scale ELCO 80ft PT boat part 2 - Posted: 22nd Jul 2018
Finish of frame cutting, some left as solid bulkheads.
Added frames to base board
Cut extra patterns for bow shape both side and deck profiles (minus 6mm stringers)
transom set at 12 degrees.

Attached Photos - Click To View Large

Response by reilly4 on the 26th Jul 2018
The best website for information on a model such as this is John Drain's
If you have not come across it already it will be an invaluable resource.
Response by CB90 on the 29th Jul 2018
Yes, I have found his web site to be great, and I appreciate the amount of time it must have taken to create such a impressive resource for all ELCO 80ft fans
20th Scale ELCO 80ft PT boat part 1 - Posted: 18th Jul 2018
Just starting a scratch build of a 20th Scale ELCO 80ft PT boat most likely PT 109 at just over 48ins long and a beam just over 12in.
Will try to construct with a combination of chine and planking construction (planking towards the bow) still need to finish of frames

Attached Photos - Click To View Large

Response by Dampfgerd on the 23rd Jul 2018
on the wood
Response by RNinMunich on the 24th Jul 2018
Agree 'Steamgerd' 😉
I also find the aerosol paper glue very good.
It doesn't soak and stretch the paper.
Used it for the new cabin roof for my Sea Scout.
The glue sticks can sometimes be a bit 'lumpy' if they are not absolutely brand new! 🤔
Above all, apply to the wood and not to the paper.👍
Cheers, Doug 😎
Response by Julio on the 29th Jul 2018
I also use the aerosol (temporary bond) paper glue for plans...

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