Exactly. Both the lower size bound and the crew requirement on Jump-capable ships have directly contradictory canon. Personally, I think relaxing either requirement changes the Traveller flavor so much that I'd prefer to keep them around by fiat, even if we can't develop a good in-universe explanation for why they exist.

On Sat, Feb 13, 2016 at 10:31 PM, William Ewing (via tml list) <xxxxxx@simplelists.com> wrote:

This email was sent from yahoo.com which does not allow forwarding of emails via email lists. Therefore the sender's email address (xxxxxx@yahoo.com) has been replaced with a dummy one.

Because Marc says so. No other reason given, AFAIK. And apparently J-Torps have been a major controversy.

From: Greg Chalik <mrg3105@gmail.com>
To: "xxxxxx@simplelists.com" <xxxxxx@simplelists.com>
Sent: Friday, February 12, 2016 7:15 PM
Subject: Re: [TML]Tracking spaceships in Jump TU, was: Instant city

I'm curious. Exactly why can't Jump drives be miniaturised?
And, if they can be, to what scale?
The reason is, it would be an automated procedure to release a message pod with a miniature Jump drive that would replicate in reverse the Jump the ship just made, i.e. returning to the ship's point-of-origin to transmit "All OK"
Failure for such a pod to materialise would sound alarm immediatelly.

Greg
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Craig Berry (http://google.com/+CraigBerry)
"Eternity is in love with the productions of time." - William Blake