Max asked a question on the BRe Questions thread but I'm responding here because it is specific to Recovery.
Max asked: “When you empty the tank by gravity on recovery……….can you winch the boat all the way onto the trailer with the tank almost full then ……..empty the tank?”
Before winching Gladys onto her trailer I remove the main ballast container hatch cover, the small hatch cover in the outboard bulkhead and, most importantly, remove one of the forward small hatch covers over the so-called self-bailers. Then as I winch Gladys onto the trailer her nose rises over the front rollers and most of the ballast water wooshes dramatically out of the main ballast tank hatch, through the sump, through the outboard bulkhead hole and out of the outboard well. The residual water soon drains through the normal drain plug, especially since I fitted one with double the cross section area to the original.
If a small hatch cover is not first completely removed from the front of the tank the lack of a sizeable air vent into the tank has a most surprising holding effect, a vacuum develops at the front of the tank and the water drains in gulps and slowly – even if with the normal air vent open.
A couple of cautions - Gladys is a six-year-old BR20 so her water-works may not have the same anatomy as a modern BRe. I am cautious about towing the boat even a short distance on rough ground with the extra 300Kgs supported by the hull, as point loads on the rollers and the rather tightly specified brakeless, 10 inch diameter wheeled trailer.
I seldom have trouble lifting Gladys over the swinging bar onto the first rollers and she usually finds her own way to sitting comfortably in the centre of the Bramber trailer. I wonder if this is because the swinging arm that the rollers mount on has a deeper vee than other trailer makes.
Matthew
BR20 Gladys