Propshaft picture

[typhone]

hello, does anybody have a picture of what kind is the best and very waterproof propeller shaft sealing system. I'm also building Typhoon sub and I really want to know how I can build this shaft sealings with no any leaks.

[anonymous]

http://www.mikessubworks.com/page1.html

What I and others have

http://www.mikessubworks.com/page1.html

What I and others have used with great success and no leaks is the linkage seals. These are commonly used on a lot of subs mine included.

He does have prop shaft seals too but I have never used them as the linkage seals work great.

hope that helps you.

Steve

[typhone]

Thanks Steve. So I'm not

Thanks Steve. So I'm not quite sure right terms so please, could you tell me how this linkage seal should be repare for this shaft or what plase it should be repare. I thought that I need very good seals at the plase where propeller shaft coming out from the inside of the hull. Is this linkage seal like as "stuffing box" and must need glued it to the hull?
I'm very thankfull of somekind picture of the all shaft construction? It helps me a lot.
I have ordered propellers in M5 (ø 5 mm) bore so do you know can I get those linkage seals for this size shafts? What I found from the net they all were for smaller size...

[JWLaRue]

Since you are using 5mm

Since you are using 5mm diameter prop shafts, then the part that you want is the "SBS-2", called a "Stuffing Box with seal". That is for a 3/16" shaft, which would be *slightly* smaller than your 5mm shafts, but should work just fine.

This product does not use grease to effect the seal, rather it uses a rubber cup seal (or x-ring). This is similar to the seals used in home faucets. It works like an o-ring but it does not have the large 'contact' surface, which reduces friction considerably.

I agree with Steve, these type of seals are very good.

-Jeff

[typhone]

Thank you Jeff. Those propellers

Thank you Jeff. Those propellers I have ordered have also available in 3/16 size. Maybe is better that I cancel that 5 mm size order and change them to size 3/16... I'm afraid that friction will rise too high if this 5 mm shaft is too thick and tight for this 3/16 stuffing box. Does anybody have any experience of those size fittings together? I live in Europe (Finland)so those mm measurement was familiar to me...

btw, which one is better seal SBS-2 or BHS-1?



Edited By typhone on 1151741113

[skip asay]

"btw, which one is better

"btw, which one is better seal SBS-2 or BHS-1?"

Both items use the same type of seal insert but each is designed for a different application. The BHS-1 (Bulkhead Linkage Seal) is designed for linkages operated by servos which means intermittent motion as compared to constant, relatively high speed rotation. Since servo arms travel through an arc, the linkage hole is slightly larger than the linkage rod to prevent binding.

The SBS-2 (Stuffing Box w/Seal) is designed for rotating prop shafts and therefore has an oilite bearing to support the shaft. This oilite bearing is a much better surface than brass as far as wear is concerned.

The BHS-1 Seal should NOT be used for prop shafts because of the oversized hole in the housing as well as the lack of a proper bearing surface. A better option is to use the SSS Seal with a suitable bearing pressed inside. While I never listed this in the catalog, I sold many in this configuration. I'm quite sure that Dave Keogh (the new owner of SubTech) as well as Mike Shubar (North American distributor) will insert a bearing if requested.

Also, a 5MM shaft (.1968") will not fit in a 3/16" (.1875") hole.

Skip Asay

[redboat219]

Hi,
Regarding what Skip noted

Hi,
Regarding what Skip noted - that the BHS-1 seals should not be used for prop shafts. how come I see a lot of modelers using them on their sub as shaft seals?

[typhone]

Ok. If I understand right

Ok. If I understand right that "stuffing box" SBS-2 is best sealing for the propeller shaft (fit only 3/16 shafts). Alexander engel www.engel-modellbau.de sell also item called "Drive Shaft Sealing Ring" which is somekind Simmerring patent. Does anybody have any experience of this item? This is quite small and short ring and I just have some doubt is this waterproof enough...



Edited By typhone on 1151852249

[bigdave]

Redboat,
I can't speak for others

Redboat,
I can't speak for others using a BHS-1 as a shaft seal, but in my application the shaft does not ride on the bearing. A normal prop shaft will ride on a bearing on either side of the seal assembly. When I use them the shaft is rigidly mounted to a gearbox and is very short. The BHS-1 is just used to hold the seal around the shaft not support the shaft itself. BD.

[JWLaRue]

That's also the way that

That's also the way that I do it as well. I've also replaced the seals that originally were in my BHS-1 (and it's 'clones') with x-rings, which work at least as well. They also work with the 5mm shafts that I have.

-Jeff

[typhone]

How do you install these

How do you install these x-rings to the hull or the wtc wall? Is there somewhere available somekind bushing "rings" or "nuts" for these rings?
If I will use only this SBS-2 sealing whit it insides somekind bearings itself, but if I will use only o-rings or x-rings I have to put also bearings for this propshaft?
Nobody never heard these Simmerring (Simrit.de) sealing rings from Engel-modelbau? Those rings are available only mm dimensioning..

[JWLaRue]

hi,

I think what Dave was

hi,

I think what Dave was saying was that the shaft seal is not used to support the shaft, rather a point on the outside of the WTC and a point on the inside are used to support the shaft. The shaft seal is only used to....well seal the shaft to prevent water from entering the WTC.

The x-rings that I am referring to are used in the same way that o-rings are. If you look at the SubTech BHS-1 seals, the x-ring (or cup seal or o-ring) would be held in place in the brass housing and the brass housing itself is mounted in the WTC bulkhead.

I don't know if it helps, but I buy my x-rings from McMaster-Carr.

-Jeff

[typhone]

Thanks again Jeff. Ok. I

Thanks again Jeff. Ok. I understand this meaning of sealing rings but if I like to use bearings to support the shaft, where I can get housing for these bearings or need I to make them by myself from brass tube etc.? I didn't found those kind housing from Internet stores or else? You use only BHS-1 for support the shaft?

[JWLaRue]

Well, for bearings that acutally

Well, for bearings that acutally support the shaft, I do not use o-rings, x-rings, or anything of the like. (they only get used to prvent water from getting into the dive module.

For support bearings, my preference is to use Rulon bearings. I also get these (in different sizes) from McMaster-Carr.

Some folks like to use "oilite", and they'll work fine...but I like the Rulon ones since they have far less friction.

-Jeff

[typhone]

Ok. Now I know how

Ok. Now I know how to go forward for this. Thank you Jeff. Also I found those sites where I can get all necessary saft parts to my sub. Propably I will need more information in the future but this forum is very good place to get it. Lot of wise guys!
Btw Jeff, you have lot of beautyfull subs in your website.