Thanks for the input.
I've found that in BSA frequently the answer is "A Troop can do whatever it wants to do."
I was looking for the BSA recommendation, which I think Bob White provided. Certainly lots of things work well with lots of Troops.
My question is one of belongingness. If a boy belongs to two patrols, a Regular patrol and a Venture patrol. What patch goes on his uniform? What is his patrol of record? During patrol meetings where does he go? If he goes to the Regular patrol meeting, then the Venture patrol suffers. If he goes to the Venture Patrol meeting, his regular patrol suffers.
Leadership another issue. If a Boy is Patrol leader of his Regular patrol, and gets elected as Patrol Leader of the Venture patrol, does he get two votes at the Patrol Leaders Council?
In talking with other Scoutmasters and looking at other Troops, I understand how some troops use the "Venture Patrol" as almost an honor group (not a full time patrol) and those boys interested earn their position into the venture patrol, or are invited to join.
I can see how this can work as well, but confusion comes in labeling it a "patrol" and trying to work it into the Troop structure.
Certainly it can work with the boys in a Regular patrol and concurrently part of a Venture patrol, many Troops appear to be structured this way.
However, I believe it would work better when a boy belongs to only one patrol. His identity is clear, his allegiance is clear.
If a Patrol is supposed to be "a group of boys who are more or less similar in age, development, and interests" it seems to make sense to put the older boys with similar interests in high adventure in their own patrol, and consider their patrol a "Venture" patrol.
The older boys which are not overly interested in high adventure, could simply be in a "Regular" patrol.
This appears to me to be what BSA suggests.
Nonetheless, I gather a Troop can do pretty much whatever it wants to. If something works well with your Troop, then stick with what works.
Again, thanks for your input.