My board bow (build along?)

[Marin]

More tillering.
I even red it out and got it up to 19" where it is 30#. I'm going to probably keep it at 30# when at 20"before trapping the back and then I will reduce the weight and start shooting! 
Attached a picture of the tiller for the day.

[bubby]

Looking good !!

[Marin]

With a trapped back, can I attempt a higher draw weight? I heard you can't do over 50# with a board bow but could a trapped back allow me to go higher?

[bubby]

There is no weight limit on a board bow, it all depends on the board and the tiller. It also doesn't have anything much to do with draw weight. If you are 30#@20" you will end up around 54#

[Marin]

Laid out the belly taper too.
Does this look about right? I had it gradually fade out before it hit the nocks.

[bubby]

I haven't ever layed out the trapped BACK you did mean BACK and not belly right😉, i just eyeball it when i trap a back, you dont trap the handle just start at the fades

[bubby]

The total area that is flat is a 1/4" not a a 1/4" in and down that will give you a 1/2" flat, just make the flat area 1/4", then round the corners off

[Marin]

Oh, so just the trapped area is 1/4". Darn it, can't believe i forgot the Pythagorean theorem 
I'll erase the lines. Didn't realize most people eyeball it.

[Marin]

Okay I must have had a huge brain fart last night cause I don't know why I said belly taper
But yes I mean trapping the back and those sanding lines are on the back of the bow.

[Marin]

Okay  got to 20" today. I'm attaching photos, the first one  is at 19" and the second at 20". It's still about 30# so I'm going to trap the back tomorrow before adjusting the weight.

[Marin]

I got the back trapped and evened out the bow at 20" of draw. I still need to reduce weight as when I placed the bow on the stick and pulled, the bathroom scale still measured around 30 pounds at 20"' so I uses trapping doesn't reduce weight?
I've attached pics of today's work.

[turtle]

Maybe its just the picture, but to me it looks more like it has well rounded corners than trapped. Trapping should reduce weight because you have less area under tension which reduces resistance to bending. I have only ever trapped two bows. On both I trapped one fourth of the width from each edge in towards the middle. This reduces the outer surface area of the back by one half. I don't know if thats the proper way to do it but it worked for me.

[Marin]

I definitely made a chamfer that was 1/4" wide.  Sorry about the bad pic

[H Rhodes]

Trapped back or not, I shy away from any sharp angles.  I sand all angles off until they are somewhat rounded off.  I believe it cuts down on the chances that a bow will pop a splinter.

[paulsemp]

 both Fades look stiff to me