I havent dont a 802, only the big momma 901 so far.
Spazz, have you seen the 901/110 Aquaclear? Its the same size as an eheim 1262 (100gph powerhead), easy as pie to mod because it has a fixed shaft, and so far I put dual 2.3" props on it, it outdid a tunze 6200, so its something like 7000+gph, and it still had some headroom. Next I am going to try dual 3" props.
On top of that, its alot less expensive than an eheim. 10,000gph? Easy. Making a shroud is a non-issue. The other thing is that the prop on the 901 seems to always start in the right direction. I suspect that due to its size, it might be a 4-pole motor...always starting in the same direction.
smjtkj, I was suspicious of the Aquaclears ability to eject the magnet/prop all together. So far, with the ones I have done I havent hit that point, but I can easily see it happening.
On that case, if the combo does make enough backflow to eject the prop, that is a good thing, as then you can make sure that the prop wont keep rotating in the wrong direction no matter what...as it will eject itself if it spins wrong. To keep it from completely falling out, perhaps a simple cross piece on the shroud, about an inch from the prop would be good. That way, when the prop starts up, if its right, it stays and chugs water. If it starts up backwards, it ejects itself...but 2 things happen when it does. One, the mag drive is broken, so the prop stops spinning, and two, the prop will not fall off completely, only enough to stop, then fall bak into place and restart.
The Aquaclears do seem to have a very strong magnet for their size...I was able to run a 1.25" Dumas prop on the small 5 watt one (with the wattage drop it was prolly something like 3 or 4 watts) and it did great. Better than a MJ400.
I do have either an old 402 or 802 around here somewhere...Ill find it, mod it, and let you know what I come up with.
, I answered your quire regarding the CF shaft question a while back 
(Titanium is what you want for the job BTW)
