Stinger install

[Old School]

After much deliberation I have decided that a surface drive will replace the conventional drive on my boat. The stinger will mount to the sloped transom on the boat but I am unsure how far the brass stuffing tube will extend beyond the transom. Should the stuffing tube exit the transom in a line directly inline with the stinger, please and should it enter the stinger housing ?

I intend a 3/16" drive shaft and because of the slope of the transom I have only found one stinger that I feel will enable the stinger to mount directly to the sloped transom leaving the drive leg in the correct line relative to the boat.

Edit: I found some information on this thread. Suggests that the stuffing box should enter the stinger about 3/16" - 1/4" and be sealed.
https://forums.offshoreelectrics.com...tinger+install

[rol243]

you normally have about 1/4 to 1/2 an inch of brass stuffing box tube sticking out the transon and wneh you fit the stinger this amount of tube goes into the stinger housing.

[Old School]

Many thanks. I had read that stingers are "adjustable" and assumed that they could be easily "tuned" insitu and wondered how if the stuffing box tube had been inserted. Thus "adjustable" seems to refer to initial installation fine tuning.

One further question. Should the leg of the stinger lie parallel to the water surface?

[rol243]

you should adjust the stinger so its inline with the hulls keel and trim after running the boat if needed . the solid part of flex shaft will be inside the stinger and at the prop area , the flex part is naturaly flexable to allow for stinger adjustment. did you look at the stinger / rudder combo i linked you ?

[Old School]

Yes, I looked up the RC Boat Bitz website for several hours last night to find a suitable combination considering the excessive slope on the transom. The item linked to is fine for the propellor, however, getting the rudder to align vertically in the water was an issue. It could be overcome with a spacer on the top mount screw. There is a flange at the base of the transom on the boat and this determines how low a stinger/strut could be positioned in the vee. It would have been far simpler to start with a later almost RTR boat, but then I am enjoying the research.

[iop65]

I think you would prefer to put the stinger a few mm above the keel.
If it is too low:too little hull in the water:chine walking !

[Old School]

Many thanks. I had read to place the stinger 3 mm above the keel (prop centreline about 8 mm), so that equates to your suggestion.

[rol243]

by the time you drill the center hole it won,t be on the very bottom of hull anyway. bottom of stinger at bottom of hull , this will give the prop shaft center line about 5mm plus above the bottom.

[Old School]

Many thanks.

[iop65]

if stinger is too low he can not do much to get rid of the chine walk, if it's a few mm too high he can put on a bigger prop
Like you had ready,put the centerline 8mm above keel and avoid possible limitations on problemsolving,the hub of prop should be a few mm (2-3)above the table(stinger at 0°), if prop shaft centerline is only 5mm above bottem this gives the hub about zero or 1mm room above table:not what i would do.

[Old School]

Many thanks.

[rol243]

have to see what type of stinger is going to be used as some have a larger diameter housing and others have smaller diameter housings .

[Old School]

This is a stinger that seems to fit my requirements. I am thinking that fitting a longer adjustment screw will enable the mount to be able to fit the transom and still allow the leg to be horizontal. There may be some clearance issues that will need relieving.

http://www.ebay.com.au/itm/FLEXISHAFT-STINGER-FULL-SET-3-16-4-75mm-nitro-brushless-rc-boat-parts-model/391317356527?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l2649

After a lot of looking I have found a rudder that I can modify the mounting and adapt to my sloped transom, but alas it is 165 mm long, obviously too long. I assume that it will be a simple matter to reduce the length to something more suitable. Approximately how far please should the rudder extend below the stinger given that the boat is 70 cm in length. The rudder standoff, once adjusted/modified, should align with the propellor.

[rol243]

the cost of that stinger from the u.k. is too expensive , if your in australia why don,t you buy the one i showed you from rc boat bitz ? you have the complete bundle there and only have to alter the rudder extension bracket to get for angle to suit your transom.

[Old School]

Many thanks. I did labour over that assembly but could not see a way to alter the mounting of the rudder support arm without impacting on the integrity of the install. The stinger from the UK includes the drive shaft, stuffing tube, inner teflon tube, drive dog, teflon washer an prop locking nut. When one adds the cost of these to the RC Boat stinger assembly then the costs do come closer. A company Powerslider, has the same stinger minus any accessories for $90.00.