Phil,
I think my auto bailer is 10-11mm wide. Has not sunk yet. Concentate on reliability and you wont need to bother about it sinking! 
The prop i use is a Prather 270, i don't think they are available anymore but an equivalent should surfice. I did buy a spare which i believe is an Octura. I am going testing tomorrow so will let you know which is the best.
In standard trim i had her on the gps at 38.4 mphAndy should be working on your exhaust this weekend, got an email from him last night.
Tony is a good chap, he has helped me over the winter and he should be coming up to test with us tomorrow.
What are you using for a radio box?
Check out the February photo of the month on the main website!
Fame at last
Regards
Simon
Hi Simon
Thanks for the advice. I think I will hang fire on installing the ball-type autobailer just yet as from doing a bit of research, it seems they can leak after a while. I like the idea of the Bernoulli-driven version so I think I will go down that route in due course, but first I need to get the blo**dy thing on the water!
After your recent success with the X472 prop, I think I will bag myself one of these. I dare say I will be spending the first 12 months testing and developing anyway, so to expect to be quick out of the box is a bit ambitious I think.
As for the radio box, I am afraid I didn't go for a proprietory one in the end and built one out of ply. I also cut a slot out of the port stringer so that it sit across the stern offset to port to keep the rudder servo pretty much in line with the rudder, and to help with weight distribution. [Counter the weight of the exhaust]. The slot means that if [when!] I hit something the box shouldn't stand any chance of getting dislodged. The box itself is a bit of a monster and I have waterproofed it with a coat or three of resin after painting it. Danny gave me a bit of Makrolon for the lid which is held in place by 10 wing nuts onto a double rubber seal. in testing it seemed watertight.
I think in comparison to most people's boat, this thing will look massively over-"engineered" as I have also bonded the stringers in with GRP CSM and loads of resin to strengthen and stiffen the hull which seemed a bit on the bendy side to me. The transom plate has worked a treat and really has stiffened that up so that there is no noticeable flex at the rudder or strut mounting plate.
I fabricated an ally tube brace for the engine end of the tube and this stops any kind of movement at that end.
It probably won't do over 20mph now with all this extra material on board but at least it won't break too easily!
I am pretty much nearing the end of fabrication and can see the final straight. Next step for me is to paint the engine bay with some bilge paint [petrol, oil and water resistant, as well as tidying things up a bit] reassemble all the bits and fit the control rods and then I am done! [That last bit is freaking me out a bit as I haven't a clue on how start the process. I have a good long think about it first I think!
Nearly there....
And then I have to hand the controls over to #1 son who is going to be driving the thing! At least I get to test it!
Cheers!
Phil