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Model Forum / Radio Controlled / Water Models / December 2007Plans to suit 27T 540 Electric Motor
Ok I am completely new to RC Boats (I have various RC land vehicles though) Now I have a spare 540 27T motor and Speed Controller (out of my Wheely King which i converted to a Rock Crawler), and I would like to build a boat to get started in RC Boats... I have just built a small balsa Tunnel Hull Boat but its too small for the 27T (Its not an RC either... but i am thinking of converting it to RC) I don't really know enough about boats yet to decide what hull design to go for... I want a hull that will suit my 27T 540 motor, something reasonably easy to build, something reasonably easy to drive. I am not going to be racing... just for mucking around having fun Any suggestions? I'd also prefer to get the plans free if possible :P I was looking at this one? http://www.modelpowerboat.com/RC_Boa...2/p13_fileid/3 according to the drawings its 48inches long and 15inches wide (or is that 48cm long and 15cm wide???) If its inches that would be too big for a 27T 540 wouldn't it?  Signaturebirdie > Ok I am completely new to RC Boats (I have various RC land vehicles > though) [quoted text clipped - 22 lines] > that 48cm long and 15cm wide???) If its inches that would be too big > for a 27T 540 wouldn't it? if it is the 'wildthing' then it is 48" long, though folks have scaled down for electric power. rex Ah ok... Is it possible to get a copy of the scaled down version? What size would be ideal for a 27T 540? I want it to have a bit of speed :) Signaturebirdie think mostly people just do there own scaling...take the standard plans down to a 'copy center' and get them copied at say 50% original size. make the bulkheads from 3/16" balsa and skin it w/ 1/32" plywood. my guess is that 24" would give you a moderatly fast boat(15-20 mph), 22" would be a tad faster. 24" boats are usually powered by a 700 series motor(if you happen to find one, a super vee27 motor/power system ought to get that boat flying) hth rex > Ah ok... Is it possible to get a copy of the scaled down version? > > What size would be ideal for a 27T 540? I want it to have a bit of > speed :) Ok that sounds ok... I found out the Speed Controller Can handle down to a 20T 540 which i can get for about $20-25... :) So that will help a bit with the speed... Can I scale it to any size? i.e could i scale it even smaller... say 40% which would make it 19" Is there an ideal length for a 20T 540 motor? (or 27T 540 if i stay with the current one...) Signaturebirdie Other thing is what Prop..? How many blades? What Pitch? What Size? And What Drive Accessories (Flex Shaft... motor-shaft adaptor?,etc ) would be suitable for it? As i guess the recommended for the full size wouldn't be suitable? I'm sorry for all the newbie questions, I am completly new to RC boats but wanting to learn... (Want to build my own... so don't want to buy a RTR) I found this electric Wild Thing: http://www.rcgroups.com/forums/showthread.php?t=638510 That looks like an easy to set up prop/rudder system on it??? Is it any good? Signaturebirdie > Other thing is what Prop..? How many blades? What Pitch? What Size? > And What Drive Accessories (Flex Shaft... motor-shaft adaptor?,etc ) [quoted text clipped - 10 lines] > That looks like an easy to set up prop/rudder system on it??? Is it any > good? well on page 7 you'll find what I suggested for a 24" boat...:) most of which would work nicely for a smaller boat(substitute brushed motor and modify flex coupler selection(0.125" instead of 5mm)). up to 22" should work nicely w/ a 19-20t motor provided you don't overdo the weight. as for props I'ld start with an octura x430 then move up to an x432 once you get the boat dialed in(& get the drive train run in). hth rex I'll probably aim for around 19-20" (50cm or so...) Ok, so shopping list, please tell me any corrections i need... From www.towerhobbies.com Saturn 20T 540 Motor From www.offshoreelectrics.com Octura Coupler Flex Hex 1/8" to .130 Cable (oct-ocfhe1813)? Octura x430 Prop What Rudder/Strut System do i get? http://www.offshoreelectrics.com/products.php?cat=69 I like the look of this one: http://www.offshoreelectrics.com/proddetail.php?prod=grp-1161 but i don't want the motor... But please tell me which one would be most suitable for my motor etc? Signaturebirdie > I'll probably aim for around 19-20" (50cm or so...) > [quoted text clipped - 13 lines] > don't want the motor... > But please tell me which one would be most suitable for my motor etc? well I've been running 2 of the octura offset strut rudder combos(seperate boats), but then I like being able to adjust prop depth w/o nessessarilly changing the prop angle :). imo the graupner unit would not be well suited for a 500 series motor. about the only drawback to the octura strut is the bracket is a tad short for use on a mono(easy enough to fix, use a 3/8" spacer between the bracket and the transom). I figure that you will not be able to see the strut when the boat is running anyway...so pick an inexpensive one :). you will need a motor mount, for your boat the drmount would be overkill, if you're wanting to do all your shopping in one place, I would consider the adjustible mount that steven has listed(ose). you will also want/need a pushrod 'boot' for your rudder linkage. personally I'd go with the octura strut/rudder w/ assembled cable(you will need to cut it to the right length). don't know if you have run across this site http://www.rcboataholic.com/ but it too has a lot of good info. hope this rambling has been some help. rex So just clarifiying: Strut/Rudder: The Octura Offset Rudder System Assembled .130 able for 1/8" Props OSE DR Motor grp-3356 Linkage Boots Does the Octura Strut/Rudder come with the flex Shaft and Stuffing Tube? Yes you have been extremely helpful :D thanks so much :) Signaturebirdie yes it comes with flex, teflon liner, 7/32" brass 'stuffing tube', and a brass 'bullet' prop nut(use thread locker if you want to use the bullet nut...otherwise its a great way to lose props). the prop shaft is threaded for a 5-40 nut, one can usually find 5-40 nylon insert lock nuts in the replacement parts for R/C trucks, macmaster-carr also sells them in boxes of 100 :) rex > So just clarifiying: > [quoted text clipped - 7 lines] > > Yes you have been extremely helpful :D thanks so much :) If you are handy with hand tools and have a drill, a hacksaw, and a file, you can pretty much make all of your hardware. I haven't had any experience with manufactured hardware so I cannot recommend any brands etc however I do know that the stinger struts are a pretty good thing and don't cost the earth, when you pair it up with a rudder, you could probably get it for around 80 or 90 bucks US. I buy all of my stuff from www.offshoreelectrics.com because A: the prices are much better than in Australia and B: because I get my goodies usually in 1 week for about 11 bucks postage. As for the hull, mine is a 26 and I run a 540 brushless in it which punches out a bit more power than a brushed 700 so you want something around the size that has previously been mentioned, 19 or 20 inches. Great hull to build though, but I will say this, you might have to do some mods to the height of the deck, this boat is quite low on the water and my motor at the correct angle to the shaft virtually takes up all of the space. You will either have to raise the deck or you can cut a hole in your cowl so the motor can stick out a bit, make sure this is sealed though. Rex is pretty much on the money with all of his suggestions, he has been doing this a lot longer than I have and I have gained much knowledge from his posts around as well. Signaturedeestingray |
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