Mixing 1:700 and 1:720 ships in the one base

Personally I find about 5% to be the point where I start noticing scale mismatch.  700 to 720 is 3%, so you should be okay.  Try placing the 720 ships in background/ back part of base and it may exaggerate depth of diorama.

Ditto to both! And tall in the back is always good.

One thing though.

I don't know the protocols- Capn Mac probably does.

Any time ships are sailing close to each other, all hands on both are pretty much scared to death.

Close but not too close.

GMorrison,

That's not entirely fair, the folks sleeping in their bunks and all the snipes will be busy at their tasks, blissfully unaware of the poor ship handling :)

But, carrier and escort is one of those exceptions, since CV's often refuel their escorts to keep them on station.  So, the excort could be turning away from an UnRep and be as close as 150' or so.  

So 150 ÷ 720 is 0.2083' or 2.5" which is workable for a dio (unlike the 1000 yards back the "plane guard" position--about 4 feet at 1/720).

Another advantage would be in being able to have that swirling wake and dramatic angle in the dio, too.

Ships of such dissimilar size will let you 'fudge" the percentage difference in scale, too.  

That could be a neat addition to the dio, doing it as an UnRep refueling......

Thanks for the help guys! The idea of a UnRep was playing on my mind! I might have to redesign the size of my base, but now I feel comfortable enough to move ahead!

Except then you would be able to see differences in ladders, catwoalks, water-tight doors and the like to  at the differing scales close together.

Be a bit more drama in splitting off the UnRep in getting some heel on the DDG and raising the bow as she piles on the power.   Backdate is a bit, to a steam-plant DD and you get to add a healthy dose of stack smoke, too.

With some cool details for the old salts--like fly MIKE CORPEN 5 DIV from both carrier and DD yard arms, and have, oh, SPEED P0 TURN 5 flying just out of the flag bag on both.  (or have both signals at half-mast on the DD, representing the one executed and the other acknowledged.

Oh My :

    You gotta be an old sea dog . I still remember the Unreps from the old days .Where you had lines taking up the tension with sailors on the other end thereof . And it was scary !

    Most folks , I don't believe , can visualize what a carrier looks like at sea when shes rolling and pitching , However gently 150 feet away , and you are bouncing around on your  D.D. like a cork in a wash machine !

       Don't look up , the elevator on the side , even at deck level will scare the dickens out of you !  T.B.

I apologize C.G.

  I got sidetracked with my answer . I have mixed many of Revell's ships with everyone else's for dios. .Keep the bigger ones at the rear and it will work out fine .

Sorry guys but I want to be a math wizard:

If your ship is 500 feet long in 1/720 it will be 8.333 inches long or in 1/700 it will be 8.571 inches long. The difference is  2.77%. 

Linear Difference: 2.77%,  Surface Area Difference: 5.478%, Volume Difference: 47.888%, Moment of Inertia Difference: 73.000%. Now unless you can see the model from all sides at once you don't need to worry about volume. And you have to see it from all sides at once at all times you don't need to worry about the moment of inertia.

The math is beyond me! I have enough trouble with my own fingers and toes before we start adding XYZ to the power of A to get the size of Tab B into slot C! Hopefully in the next week or so I'll finish the America, and then pick up a 1/700 Sprunance to sit off her. Modelling the water will be interesting, this is my first crack at trying that, luckily a few of the guys from work have formed a modelling club, and one of the guys is quite good at that and will give me a hand.

I get volume difference at 22%.