The fan is very quiet.  Much more so than I thought it would be. Check out the video called Killing Spree and you can hear how quiet it is without the generator running..  The blade is a 40" three blade Composite prop that I bought from Sully's Bowfishing Stuff that is made by Competition Aircraft which (I think) has a 30 degree pitch.  It is so quiet that at idle I cannot hear the fan or engine over the generator.  At half throttle it is about the same and it gets louder from there, but not too bad.  The engine is a Honda 24HP BXF.  It has low oil shutdown because I would not be able to hear the buzzer if I got the low oil warning.  This size engine only came with a straight shaft and I got the larger of the two, either would have been fine.  The way the hub works with the prop the straight shaft is not an issue, the hub bolts together and hugs the shaft so there is no slipping.  The engine also has an oil cooler and voltage regulator/20 amp charger.  I do not ever have to worry about draining the battery.  As you can see the muffler is mounted under the engine and since 1" exhaust pipe is difficult to find, if not impossible, we used 1"EMT for the connection.  It's not a Jesse James' exhaust but it does work.

The throttle cable I bought from Arrow Prop.  It is the plastic lined cable with the stainless steel aircraft inner cable.  This cable is very smooth and bends very easily.  It also has a hard outer shell and it pretty tough.  The brake lever I picked up at a local bike store along with a grip.  The steering stick is 3/4" EMT mounted on two pillow block bearings with the same sized hub as the one under the engine.  I would recommend something larger, since 3/4" EMT tends to bend.  A 7/8" pipe is bent around and is bolted to the steering stick.  This is so a standard grip and throttle can be added.  We had to make some minor adjustments for the throttle at the engine, but nothing too drastic.  Since the original installation of the steering stick we made some important changes. We broke the thin walled 3/4" EMT just from use. If we had the second bearing higher, then it might not have been an issue. At any rate we switch the EMT out for 1" galvanized pipe and welded the EMT to the pipe so that we do not have to change out the handle. We also changed out the upper bearing, since it was only a 3/4" for a plastic teflon block. The hardest part about this was drilling a hole in that stuff because it is so tuff. Since it is teflon everything slides on it very easily, including steering sticks.

For the cable we used 25 feet of 1/8" standard cable, non-coated.  It is threaded into the hubs and wrapped so that when you turn the stick one way one cable pulls and turn the other way the other side of the cable pulls.  We attached two turnbuckles so that we could remove or add slack to the cables as need and if they ever stretch.  At first when the fan was running it had a tendency to want to turn around.  We tightened the cables so that when the prop is running and you let go of the steering stick, it would not turn on its own.

The engine mount is made by Kyle Kleb and it would be best to ask him specifics on it. There are many other fan mounts that look similar and they are all either his design or inspired from one of his mounts. There is an inner and outter pipe with a bearing on top and bottom and the hub is screwed into the inner pipe to take the load off of the bearings.  The frame is made from 1" square tubing and is then welded to plates of 1/4" angle iron.  None of that aluminum stuff that can break!  The frame is then attached to the boat with 5/16" stainless bolts.  All of this is then grinded, primed and painted.  The engine mount (which consists of the upper mount, lower mount, and hub) slides into the stand and is bolted into place.  It technically could be taken apart to get under a low bridge, but would prefer to find somewhere else to fish instead.

The shroud was made from 1/2" square tubing that was bent approximately 43" with 8 braces.  At present there is no rear guard because if you have 30MPH winds blowing you in the face you should not be stupid enough to put your hand in it.  Honestly, it is the other end of the blade that is the sharp one.

You can see from the pictures we used the hub in the rear and one just like it attached to the steering stick in the front to control the steering.  With the stick facing forward I know the fan is facing rear so I have a pretty good idea where the fan is without looking backwards.

The fuel is pumped up to the engine from a tank on the floor of the boat using a low pressure (4 lb) fuel pump.  We are also using a regulator (1 - 4 lbs) to keep the pressure in check. Without the regulartor the engine would flood.  All the cables, the wiring and the gas line at run through the middle of the engine mount pipe.  This gives the fan a very clean look.

I cannot give enough credit to Kyle for the design, welding, and just overall knowledge of fan motors and bowfishing rigs in general.  If you have questions or can think of things that I have not covered, please let me know.  I wanted this page to be as informative as possible.

If you are looking for a shroud, Kyle can build one for you at a fair price.