Wow your research skills are far superior to mine. That comparison chart is the single most useful piece of information I've seen so far.

It looks like the CH 640 has advantages over just about every common comparable certified aircraft available. That extra shoulder space would be a real benefit to me.

I guess the problem is that there are just so many old certified aircraft out there that can be bought right now, rather than investing thousands of hours into a project, that most GA guys just go with something already flying, even if they're aware of the CH 640. Whereas with the CH 750 etc there is really nothing comparable out there for what they do.

I still really like the all around advantages of the CH640 though. Are there any major roadblocks to getting a kit to the US from Canada, which appears to be the only place they're available? Any FAA special hurdles to getting its air worthiness certified once its built compared to other kits?

Also, I read somewhere that the CH 640 doesn't have a build plan manual like the other Zeniths but that information might be old. Is there a good manual available to guide through the build process or is it pretty much a figure it out as you go arrangement? Id hate to walk into any pitfalls.

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