I wanted to mention something about the CH-640 that I dont think has been floated around before. If you really wanted 4 guys to ride in comfort. The rear passengers could be turned around to sit back to back with the front seat. This would move the CG forward for the rear passengers and you could then then probably safely put a foot well area , making the rear passenger area more interesting. 

I saw this Idea on the Bearhawk site, as some there have converted that plane into a 6 seater in special circumstances and also to improve cargo CG if flying as a 4 passenger.

The construction standards book I got with the CH640 plans is dated 2002, I downloaded a more recent version dated 2011 is that the date you have?

Maybe they send the old version for nostalgia sake..lol

The question I was wondering about is in the general tolerances, in my new book on page CS #300 top graph . Is it saying youre allowed a 3 millimeter error over meter distance? and the bottom graph on same page us just the exceptable error over larger distances?

does the small l = length

I just want to make sure i`m understanding this part.

so bottom graph is saying you could be off by a centimeter over a 8 meter distance?

not that I plan on being that far off but I just wanted to confirm Im reading this right.

I saw your chat chat out. You been a huge help. I went online and bought the Homebuildershelp videos 

-Basics of scratch building, they build a 701 rudder parts from scratch

-Metal working 101 they put that rudder together

They even tossed in a free video - How to build an RV7 tail kit, but Ive been there done that so didn't watch it.

One thing they left out of the videos is how to drill the Rudder skin to match the rib layout. The metal working 101 video uses a pre-punched skin. so I never get to see how a blank rudder skin gets drilled out.

Do you know of any good videos or literature that covers that. Taking the blank skin and matching it to the rib skeleton.

Hi Greg you've been a huge help so far in pointing a new scratch builder in the right direction. Got another question for you and I should be good for awhile...lol

In my quality standards book that came with the plans it goes over the exceptable limits for errors in construction and has a number in the triangle. To this point i`ve just banged together metal from kits like my RV-7 so this is new to me.

Have you covered this in one of your videos or can you point me in the right direction to someone that has gone over this. I really want to get a good handle on it.

I saw your video on cutting out 0.063.  Have fun bending 75-F-3-6, 75-F-3-7, and 75-F-3-9

Hi Greg, 

Very nice work you are doing here. I think there is a file attach option here. If you prefer I can send you my personal e-mail ?