Sorry folks but but never in a million years would it occur to me to use screws to hold down hull skinning during gluing. That to me would mean 'screwing it up' and just create more work later to seal and fill the ensuing holes.
My instinctive method when at 15 years old I started constructing my all balsa scratch built 1:72 scale H class destroyer (pics attached - in company with her 1936 contemporary U-25) was to first 'persuade' the hull skins into the approx curves needed, by dampening the skin sheets and bending them over my knee. Just like I'd seen my Dad do when he built his Lesro Sea Scout (See my Build Blog ref Sea Scout Jessica restoration😉).
Then I'd use clothes pegs, bulldog clips, elastic bands, packing tape or anything else I could find to hold the skins in place while gluing. Even if it meant sitting holding the whole schemozzle together by hand until the glue 'grabbed'.
Nowadays (some 55 years later🙄) given the plethora of clamps in various formats available there is really little excuse for resorting to relatively brutal (and expensive, skinny brass screws aint cheap) methods such as screws.
First rule is to prepare the skins by steaming/dampening and bending to the approx required shape. This significantly reduces the stresses in the skin which may otherwise cause it to spring off the hull frames. Many folks (such as mturpin on this site) make jigs to bend skins and planks to the required curves before attempting to glue.
In extreme cases brass planking pins are useful. Ca 1mm diameter, use a 0.8mm pin drill to pre-drill the skins and formers for an easy fit. Punch the pins heads just under the surface for easy filling and hiding when all the glue is set 😊
Dave's cocktail stick pins would also work, given sufficient hull frame width!
I've also seen guys (also on this site) who've used turned down bamboo chop sticks as pins.
But they are very very hard and you may find that when sanding down the hull that they still stand proud of the softer wood around them.
Just my thunks, but whodda I know 😉
Happy gluing, hope you don't come unstuck.
Cheers, Doug 😎
No likes yet
This member will receive 1 point
for every like received