This is ment as documentation for reference.
A bird-cherry (prunus padus) prod.
String: 75 cm
Length measured along the bow back: 86 cm
Width x thickness: 40mm x 38 mm at middle,
25mm x 23mm at tips.
Power stroke: 183 mm
Brace height 190 mm - measured fom belly of the bow
Draw weight after first test shooting : ca 150 kg
Stave is a sapling with natural deflex close to brace height.
The prod is seen here mounted on a temporary tiller with even more temporary whippe contraption.
The string has required some adjusting , as can be seen from asymmetric serving and loops.
I might built a nicer tiller for this if the bow survives some more test use.
But mainly this is a feasibility study and practice run. I have an other stave waiting that should make about 800#/7" bow and a 5"x3" rowan log to try a proper medieval style 2000 lbs military crossbow...
... - maybe, one day.
I started this current one last summer and it took a while of re-tillering , re-stringing and breaking in to get it hold the string tension after spanning.