Question:

I fly a Tony Clark (Practical Scale) Tiger Moth, 270cm span, 38cc with gear reduction unit, 31.5 inch prop.
Made already hundreds of safe landings with it, like to fly continuous touch and goes with part power, very scale like.

It has a peculiar landing effect which I normally compensate for (increased rate of descent shortly before flaring) but yesterday I was explaining it to a friend and decided I just let it go once, see what happens:

Made a very flat powered approach with normal final speed, a condition from which even without flaring a good landing would result. No wind conditions, so no shear, did not move power.
With wheels about a good foot above the grass, rate of descent increases.
Alas for me the demo went a bit too good, prop broken and axle of gear drive needs re aligning....

I do not recall this effect from other biplanes, nor can I remember if the 1/1 did like this, as I flew it for a few hours, long time ago.

The only explanation I can think of is that the lower wing picks up ground effect, but as it is largely behind the CG, it produces a pitch DOWN effect.

Anyone recognises this effect from other bipes?