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no doubt you would use the same size esc for 10s and 12s power set ups so the esc is right to go. now is there much difference between a 5s pack and a 6s pack ? are the 5s packs harder to come by ? i have seen many more 6s packs available than 5s packs . what do you,s think ?
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I had a quick look at Hobbyking and Turnigy Graphene 5s (5000 mah 65C) are readily available as are 6s packs.Comment
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When you are considering higher voltage setups, high highest C ratings are not always required, especially if you are just blasting around the pond and having fun.
My 10S race boats have been purring away happily for the past few years on boring old Turnigy 5S 30-40C batts. Remember, when you parallel the packs, they "share" the load.
Just a thought on potential cost savings.Grand River Marine Modellers
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Exactly Doby! I’m running some used racing batteries, put them in series instead of running them in parallel like the guy I bought them from, and get great run time. A 30C, 5000mah Battery is plenty on a 100A max draw. If your running 8s, that’s 3000W to work with, not bad for a 34” hydro. I try to keep my amp draw at 100, and design the other things around it. A 51” Mono is going to take some Watts to push it with enthusiasm. I was figuring 6000W on that, so that would be 135A at 12s, that’s why I endorsed that. 5000w gets you down to 112A. Sorry I took the “stupid fast” comment personally, was probably not directed that way...Comment
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Many thanks gentlemen, a lot of information to absorb.Comment
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Further reading in that these hulls seem problematic. Firstly, they are a thin construction and obviously require a full layup. Secondly, the hull is untested and it seems the hull suffers from bow steering. This has been "blamed" on either a hook in the rear step and secondly the rear stepped platform is poorly designed in that it should be a relatively flat side on view (refer prototype photographs) whereas the hull extends downward from the rear step to the transom forming a wedge shape. This acts like a permanent trimtab, causing the stern to lift with a resultant spinout. The effect is much like broaching on a sailing yacht.
The suggested remedy is to cut the hull from the transom to the rear step and remove about a 1/4" wedge to allow the rear platform to assume a flatter stance. As the hull requires considerable reinforcing, the remedial action is perhaps not that drastic. I have yet to actually see a completed DT 51" mono hull project.Comment
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I'll assume this is the hull in question...looks good on the water.
IGNORE the stupid speed claims as the "company" G Freak is the equivalent to the Beavis and Butthead of the FE world.Grand River Marine Modellers
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Yes,
that is the hull. May be purchased on evilbay or direct from Toucan Hobbies for a few dollars less. I notice that Beavis and Butthead did not even reinforce the hull and yet claim 90 mph. The hull is primarily a gas powered hull designed for 26 - 30 cc motors.Comment
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While I would prefer a P1 mono, the possibility of uncontrollable bow steering has me concerned. My son prefers cats and as it will be a long term project for both of us I am now heading more along the lines of a 51 inch catamaran. A video online with the stock LP 4082 twin setup shows a very stable hull and a GPS of 68 mph. For an old guy that is more than enough excitement. No doubt my son would rather extract more speed.
The stock hull would be purchased and reinforced then fitted with twin TP Power 4050 or 4060 motors around 1200 - 1400kv. I would prefer a 6s limit per side. If insufficient voltage then perhaps a lower kv motor setup.Comment
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how about a 50 inch aeromarine twin offshore cat hull. [ hobby supplies melbourne ] these have good length and a decent width and there a proven hull.Comment
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At roughly $600.00 and who knows how much for courier postage given the size of the package, the hull is twice the price of the Chinese model. Personally the design looks more like a mono deck on a cat hull. The Chinese hull will require reinforcing and this will add cost, but that is the fun of building it to run fast.
I know little of gas boats but going on videos seen on You-tube gas powered boats do not seem to have the pace of FE and I wonder if the Aeromarine hull is up for the job. In this video the stock DT boat with twin 4082 brushless and 120 amp ESC's looks very stable at almost seventy mile an hour.
I appreciate the quality of the Aeromarine products and thankyou for the suggestion but it does not really suit me.
One minute into this video is the stock DT51E. Very impressive.
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Would 1/4" flexshafts be needed for a 51" catamaran hull please? If not essential would they be preferred given that I am thinking using twin TP Power 4070 with 8mm shaft. Would a flexshaft with the stub shaft turned down to 3/16" be preferable as it would allow a better selection of propellors.
The "factory" boat uses a 45mm prop however this seems small for a 51" cat hull.Comment
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yes i would go for the 1/4 inch shafts with the stub turned down to 3/16 as you can always sleve the stub if you need a 1/4 inch prop. in the octura prop range , the largest 3/16 prop is a 65mm then comes the 1/4 inch 67mm and up.Comment
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