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Hi all. Recently I had some advice on ose forum to run the strut on my 32" cat 3/16 (3mm) above the ride pads… fantastic advice never run better with a top speed of 51mph with a slight chop and breeze. During the course of that same day, the water had smoothed out and the boat started running wet with slight porpoising. In order to rectify the issue I first raised the strut a little with no cure, then I tried the lipos a little further forward with the strut back to original spot (3/16 above pads) which got rid of porpoise but was running way wet with a top speed of 44mph (7mph slower than earlier in the day). Once again I could not get the setup correct for changing conditions. Am I on the correct path in making those changes and also how to know what change to make first… battery placement, strut height or strut angle? I'm still fairly fresh when it comes to boat setup.
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Any race boat, real or r/c doesn't like glassy water. A minute breeze is better than none at all, it helps to break the surface tension and free up the boat. Certain gas boats I had were slugs on calm water, even with a slight breeze. Put another boat or 5 out there and it ran with the best of them due to the choppy water. In your case, I would have moved the batteries back, to change the cog to the rear more. That would get the nose up. You would probably have to let off coming into a turn more or sooner or both to set the hull. If moving the bats weren't enough I would put 1 degree of positive in the strut at a time (like 1/32 inch) to help and move the bats to adjust the cog to balance it out from there. Im new to f/e but I have been running r/c boats since '03. Hopefully people will agree, it will be interesting to see if I am on the right track.Steve Mitchell -
I often hear the comment that R/C boats need rough water to run their best. Actually the fastest R/C boats - FE or fuel - will run their fastest on smooth water. At any SAW event the fastest racers wait for the "witching hour", the period of flat water around sunset to try to make their fastest runs.
It is true that many R/C boats seem to run faster on rougher water, but that is because the boats are not set up correctly for the conditions. This makes sense because most don't run on flat water, and a boat set up correctly for flat water will blow off on chop. Then there are hulls so poorly designed that they won't loosen up on flat water. But most boats will run fastest when set up and run on flat water..ERROR 403 - This is not the page you are looking for
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Strut angle(slightly pointed up or down) should take that porpoising out... From your explanation I would try a slight positive angle(prop pointed slightly down) and your batteries at their normal location for COG and position the strut slightly above the ride pads (1/8" to 3/16"). It should fly and the nose should not bounce up and down...
Think of it this way, you will be using the thrust of the prop to control the attitude of your cat. It don't take much.
I have a 30in cat and this is the way I have mine setup.Last edited by high-tech; 07-13-2014, 10:41 AM.Keith Geusic #677 NAMBA District 19 Seaducer Gas MONO, Aquacraft Revolt Fe30, 30in Max Cat scratch BuiltComment
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Fluid I agree with a lot of what you are saying. SAW is a different animal then circle or sport running. Flat calm water is a must. Just about every APBA boat race from the time I was involved until today when I go watch wants a tiny bit of ripple to help keep the boat from sticking to the water. With our boats it all depends on setup. I can't tell you how many boats, especially gas boats are known for being great rough water boats, but are slow in calmer water. Even the builders seem to own up to some of their handling flaws. Its up to owner and/or driver to get their setup and/or learn to setup and drive in certain water conditions. Being able to adjust to both and keep your boat right side up and still be fast is the key.Steve MitchellComment
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I moved my strut yesterday on my 32" cat. It ran 60.7 with the bottom of the strut 1/8" higher than the bottom of sponsons. Then I lowered it (1/8" lower than the sponsons) with no other Changes it ran 67.9. I say this because the way you worded it, it seems to me you made more than one change at a time. I recommend doing one change at a time...even if you think that the two changes your about to make are both going to help to the positive. It doesn't always work that way. Yea, 7+ mph I picked up from lowering the strut.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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Based on how many gps runs? Sometimes gps gives false readings
Sent from my iPhone using TapatalkThere's a hole at the center of earth where the rest of the world sinks but i stand still...Comment
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No kiddin.... Well that's cool.
Sent from my iPhone using TapatalkThere's a hole at the center of earth where the rest of the world sinks but i stand still...Comment
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The last couple runs front the first one dropped down in the 50 ' s. However, me and my son both felt on those passes it looked visually slower. I have the videos to prove it. Found out when I got home that the strut moved. Seems to be a common thing when running this boat. I then roughed up the strut surface and cut grooves into it with a file and went back out. Strut didn't move and was consistent again. I have found this particular gps is very very consistent. I can run my rc car the exact same way two or three times in a row and will come back within a tenth or so of what it did before.32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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I did make one change at a time. Firstly it was strut up, that didn't help. Then lipos further forward with strut back to starting point.… didn't help either. By that stage I had no charged lipos remaining. I never thought of dropping the strut as I thought this would drop the bow and run wet. I suppose it's all about testing and trying different things for particular hulls.Comment
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32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) wasComment
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