Looking for a new cat

[gfm1135]

Keith, what I was looking for was advice on what Cat I should consider. Your posts where nothing more than an opposition to Dave's suggestion and opinions. What would you suggest?

[keithbradley]

The Genesis is has a scale bottom, with no ride pads. This makes for a good straight-line hull, but poor stability in the turns. The overall quality of the proboat and AQ models will be higher as well.

^^^

[tlandauer]

Keith, what I was looking for was advice on what Cat I should consider. Your posts where nothing more than an opposition to Dave's suggestion and opinions. What would you suggest?

I would not be so ungrateful if I were you: regardless the opinion of other people. You posted a question, people with good intention replied to you, if they have a disagreement, may be that is even better for you, you can also learn from their disagreement.
Sorry I am interrupting here, guess I am always grateful for knowledge and the time people have spent posting here, nothing personal to you, just how I operate.

[gfm1135]

Ungrateful????.......whatever...

[1945dave]

Thanks guys, I learned a few things as well. Turns like a shed. Turns like a pig on ice. (I really like that one).

I'm done.

[Fluid]

Geeze, I don't visit for a few days and the thread turns into a mess. I see nothing has changed from my original suggestions to the OP - an AQ or PB RTR. Once you put one of those together you'll learn enough to tackle a larger, more complex build.

BTW, a catamaran is not an OB tunnel, their purpose and design are completely different. This fact seems to have been lost on some posting here. There is a reason that every winning competitive fuel-powered catamaran heat racer for the past 25 years has had ride pads on the sponson bottoms. They work well at holding the hull at a more constant depth, reducing hooking and increasing cornering speeds. Constant deadrise sponsons work better in rougher water but by their very design they limit turning speeds unless combined with vectored thrust. Look at the full-scale offshore cats, they hook out regularly.



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[NativePaul]

My opinion of cat deadrise differs to Kieth's and Fluid's, the reason that the Genesis and Explorer don't handle well is simply that they are too narrow.

I have built several constant deadrise cats in the past which have handled impeccably without vectored thrust just using an offset rudder, and adjusting the boats attitude in the corners with that. I believe that a constant deadrise sponson must run deeper to give the same wetted area that you need to plane the boat, and when setup correctly the inside edge of the inside constant deadrise sponson during the turn acts like a turn fin and will let you hang the boat off it to a greater extent than you can with ride pads.

However constant deadrise does have its disadvantages for handling too, and again that is due to width, if you take 2 cats both 12" wide with 3" wide sponsons and 6" wide tunnels, one has constant deadrise and the other has 1.5" wide ride pads, at speed they get up on the plane and lift out of the water so little of the sponson is wetted, maybe only half an inch of the deadrise is touching the water, but the full width of the ride pad will be, so at speed the waterline width of the deadrise hull is 7" and the ride pad boat is 9", if you add the extra 2" to the tunnel of the deadrise boat it will handle as well or better than the ride pad boat. Having said that the flat planing surfaces of a ride pad boat are more efficient at providing lift which gives higher speeds for the same power input.

A ride pad boat can turn well enough for the prescribed radius of the ovals I race on, and I don't sport boat any more doing 180s and such, when I run away from races I try to imagine the oval buoys and run round them, and the majority of races through the year are reasonably calm, so the last few cats I made have ride pads and I am happy with that choice.

Current full size offshore boats do handle badly, and it easy to see why as they are far too narrow and have tiny rudders, if they were models they would be for SAWs type running and not suitable for oval racing, but that is fine as they go many miles in a straight line between turns so top speed and rough water stability are more important to them than handling.

[flatline33]

wow, i have owned a genesis for 2 years now, and after a lot of testing i can say that yes it will spin/roll at wfo in the turns, what i have done is set the servo to only move the rudder 1/4 in both ways l/r. this has eliminated the roll issues and still will turn short corners ok, i have upgraded to a leopard 4082 in 2200kv with a 180a turnigy esc on 2 gensace hard case 2s2p 5800mah lipos spinning a octura m645 prop, this seams to be a good reliable setup. i have a miss bud nitro hydro that i got before the genesis that was stable as a rock in wfo hi speed corners but it was a nitro boat and quirky( it is getting a brushless setup as we speak). from my experience i would buy another genesis/daytona in a minute it is a blast stock and a rush modded, also i have had a 39 inch v bottom brushed boat that was great in rough water, oh and 1945dave u da man,