BJ55 Aeromarine rudder upgrade
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BJ55 Aeromarine rudder upgrade
Anyone have a copy of the instructions where it says to trim the rudders? I heard about this on the forum and I've been looking closer at mine and have a feeling I know what they mean but I'd like to see a copy of the instructions if possible.
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RE: BJ55 Aeromarine rudder upgrade
Similarly on an RCMK rudder, I just filed the inlet hole forward to make it have a small notch in the leading edge, but then again the RCMK rudder isn't as wide as the AM one. It still has the same problem with not picking up water over a certain speed if not modified. Once I filed the inlet holes forward the problem was solved.
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RE: BJ55 Aeromarine rudder upgrade
I sheared off the flat section at the leading edge and sharpened it on the disc sander. I'll run it tonight and see how far up the water comes out of the fittings. If it looks good I'll switch my cooling lines.
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RE: BJ55 Aeromarine rudder upgrade
ORIGINAL: PEERPSI
I sheared off the flat section at the leading edge and sharpened it on the disc sander. I'll run it tonight and see how far up the water comes out of the fittings. If it looks good I'll switch my cooling lines.
I sheared off the flat section at the leading edge and sharpened it on the disc sander. I'll run it tonight and see how far up the water comes out of the fittings. If it looks good I'll switch my cooling lines.
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RE: BJ55 Aeromarine rudder upgrade
It would shoot up about 1 1/2 to 2 feet. First time I tried them I burnt up a set of O-rings so I went back to the OEM pickups.
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RE: BJ55 Aeromarine rudder upgrade
peerpsi did your areomarine rudders work better after you shaved the the taper off? I left mine alone and use the stock tubes yet.
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RE: BJ55 Aeromarine rudder upgrade
After shearing off the flat spot on the leading edge, about 3 to 4 mm, I tested to see how much water shot up compared to previously. I'd say it was easily one foot higher over the previous 2 foot height. So I went ahead and changed to the rudder pickups and gained 3.8 mph. This took place within about 10 minutes so water temps and everything were the same.
I used our large diameter disc sander to sharpen them as well. This is a job that could be easily done by draw filing if you don't have access to a disc sander.
I used our large diameter disc sander to sharpen them as well. This is a job that could be easily done by draw filing if you don't have access to a disc sander.
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RE: BJ55 Aeromarine rudder upgrade
Do you think the stock pick-ups caused that much drag for you to gain over 3 mph? That is the cheapest bolt on part you can do to gain that many mph.
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RE: BJ55 Aeromarine rudder upgrade
You'd have to have the HP to push it there but yep. 3.8 MPH just ditching the original pickups. Added bonus was that it tracked straighter. I think that's due to the way the original pickups work with there slant cut. If you don't have them exactly the same I expect the pressure is different one side to the other.
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RE: BJ55 Aeromarine rudder upgrade
Mine doesn't track very good either. I pulled the areomarine rudders off today and cut that that tapered strip off and sharped them tomorrow I will gps the stock pick-ups and then pull them off and gps again without them and see what I get.
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RE: BJ55 Aeromarine rudder upgrade
Sounds like a plan. I was quite surprised to see the 3.8 MPH gain from them. Good luck with your run tomorrow.