MRP boat questions

[AVtech]

Hello I am new to the site and have been out of rc boating for awhile but getting back into it. My current boat is an MRP bud dry cat which I have upgraded with dual titan motors (direct drive mrp dual motor setup), an EVX 16.8v ESC and 14 propel 4500 cells. The boat runs pretty well with the stock red plastic prop (1.75 pitch) nothing getting too hot, warm maybe and there is no water cooling. I am thinking of upgrading to an octura X432 (1.932 pitch) and see what happens. Any suggestions? My next boat (NIB ebay score) is an MRP bud lite tunnel which I plan on running with 10 propel 4500 cells with a Novak T-4 ESC to start with and then go from there. I also have a Mr. Pringles Hydro that I plan to get running soon. I am sure some of you have had experience with these models and thought I would ask for some free advice. Thanks in advance for any information.

[Fluid]

First off WELCOME! I think you must mean the x435 prop - the x432 has the same pitch as your current one. You could probably go with a y534 (2.0" pitch) for even more potential speed. But to get going really well that hull needs a larger prop, 38mm to 42mm in diameter. The problem is you will get more heat in the motors, ESC and cells. For your current setup the above props should run faster without melting anything.

You really should replace any Tamyia-type connectors with Deans plugs (Steven sells them here) for more power and less heat. That boat has a lot of wetted area and should have the CG (balance point) about 30% forward from the sponson transoms.

There are a lot of things to do to make the MRP boats to make them a lot faster, but that costs $$$ and those old hull designs are just not suited for it. Have fun with the models as they are with modest prop changes, and when you are ready move up to high-performance hulls. You will be much happier and $$$ ahead.



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[AVtech]

Thanks for the info. I found a Y534 on ebay for $1.50 so I am going to try that first. No tamiya connectors here, I have the first generation deans plugs. I am going to go with a flex cable setup in the hydro and wonder what the advantages are over a solid shaft? I know an adjustable strudder assembly would probably work well for the bud dry, however what diameter cable would be good? I know these boats are old and obsolete but the name of the game here is fun, I even got my wife into the sport.

[Fluid]

If you are going to stay with 12 Ni cells then a 0.130" cable is fine for both the hydro and the cat. The flex cable advantage is its adjustability - there is none with the solid shaft, this was one of the shortcomings of the original MRP hydros. MRP finally saw the light and changed their design by adding a flex calbe, etc., but it was too late by then.

Good luck and keep us posted!


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