in a large boat 48 in. mono would it be better to use a tp 4060 1050 kv with a 69mm prop or a 1950 kv with a 47mm prop running on 6s. won't the bigger prop get the boat on plane better or will it be to much for that motor?
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prop and motor setup
in a large boat 48 in. mono would it be better to use a tp 4060 1050 kv with a 69mm prop or a 1950 kv with a 47mm prop running on 6s. won't the bigger prop get the boat on plane better or will it be to much for that motor?
Fast Electric Addict!
For a 48" mono you will need a motor that is larger unless you plan on buying a NEU or Lehner of approximately that size.
May I suggest a 1000kv SSS 56mm x 94mm on 8s2p with approximately 8000mah + min 40C rating.
These are very reasonable priced motors and run very nice. Sf240 minimum sf 300 is better.
You can also get a similar motor from Steve at OSE, a Leopard 56 x 84 or 56 x 94.
The large hull requires a larger motor to displace the geat
Nortavlag Bulc
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i am running a twin setup in this will that make a difference
Fast Electric Addict!
You really need to give accurate descriptions of what your set up is,, so OP can access your set up for the proper advice I can't believe you failed to tell us it a twinOriginally Posted by rad35
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sorry guy's ya i should have added that my bad.
Member
The way i understand this is the bigger props and lower kv gets the boat on plain with less amp draw i have 6's batterys so it may only do 40 or so but i can always go to 8-10's for more speed.
maybe im not understanding this right?
Fast Electric Addict!
1950kv is to high kv for 6s at over 43000rpm unloaded, 6s needs to be around a 1400kv motor.
Fast Electric Addict!
Your not going to be able to run a given motor & kv on 6s, 8s, & 10s, it dosnt work like that re kv x voltage. You will either be to low on rpm or way to high on rpm.
Fast Electric Addict!
Your not going to be able to run a given motor & kv on 6s, 8s, & 10s, it dosnt work like that re kv x voltage. You will either be to low on rpm or way to high on rpm ie 1400kv x 6s will give you 31000rpm unloaded which is ok , on 8s = 41000rpm is to high rpm. 10s will give nearly 52000 rpm way way to high.
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martin i see what you are saying. If i use a tp 4260 it replaced the 4060 1050 kv on 6's whith a 69mmx1.4 pitch prop according to the speed calculator it will run loaded rpm 18648 speed 50 mph. 8s same prop loaded rpm 24864 speed 67. 10's loaded rpm 31080 speed 84. max amps for that motor is 137 max volts is 51 are these props (running twins R&L) going to be to much for the motors to get this 48 in. vx rocket up and going
Fast Electric Addict!
69mm is a massive size prop for those motors, you must also bear in mind that when you increase voltage from 6s to 8s & 10s you must reduce prop size accordingly. You cant just use the same size prop across the board.
Not there yet
Did I not just show you a vid of my 40" twin mono running only 42mm props ripping along nicely? 69 mm is way big.
Those big props are going to overwork an ESC immediately. There are two schools of thought on the lower RPM/big prop and small prop/higher RPM but 69mm is overboard.
And also remember when playing the numbers on motor specs that those are Max. Not the continuous rating. Continuous is the lower number.
Shawn
Last edited by srislash; 10-29-2016 at 08:55 AM.
Fast Electric Addict!
Using speed calculators can be misleading, as you increase voltage & rpm on a given motor the motor efficiency normally drops off the higher you go, their for deducing the calculated speeds. You will also get more prop slip the higher the rpm goes slowing the calculated speed further. Theirs no way you will see 84mph with those motors in a 48" mono.
Fast and Furious
How about a reality chech. A 48" mono is WAY bigger than a 40" hull. The OP clearly lacks the experience to build a twin boat which would challenge an experienced builder. If he wants to waste his time and money on failure good luck to him. He has a far better chance for success using a single Castle 2028 on 8S or 10S. This is a proven drive system for large boats, is less expensive than twins and will be far more reliable. Again, his choice.
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Not there yet
And this was suggested in another thread, same OP.
I wasn't trying to say ' run 442's' just that it doesn't take a HUGE set of props to move a hull. I probably should have been more clear on that.
Member
ok i agree with shawn i was just trying to understand the difference in kv's and prop size shawn boat go good will probly use a setup like that. I am just throwing out some senarios to try and understand better i know the prop and motor size may no be perfect. Fluid i may be somewhat new at this but everyone has to start somewhere i love a good challenge has anybody tryed a 65 in. mono whit 4 outboard's LOL .maybe next challenge?
Fast Electric Addict!
I really think you should just buy a factory RTR and learn and mod from that
Member
shawn thank you for the good info it is greatly appreciated i was wondering if i should use cont. ratings or max ratings to calculate this stuff.
thanks again
Member
I have a traxxas spartan that i have been playing with for a couple years cc1515 2200 kv octura 645 prop gps speed 72mph just trying something new dont know as much as some of you guys but im trying to figure it out dont have any boat clubs in my area so doing the best i can. my vx rocket hull had twin drives installed when it was given to me so trying to make the best of it.20161023_153002_001 (360x640).jpg pic of boat.
Member
I have a traxxas spartan that i have been playing with for a couple years cc1515 2200 kv octura 645 prop gps speed 72mph just trying something new dont know as much as some of you guys but im trying to figure it out dont have any boat clubs in my area so doing the best i can. my vx rocket hull had twin drives installed when it was given to me so trying to make the best of it.20161023_153002_001 (360x640).jpg pic of boat.
Member
opps didnt mean to hit that twice.
shawn what kv are you running on your boat?
Not there yet
My twin Lazer runs 1180kv motors on 8s
And ok now that we know why you want a twin setup recommendation, any chance of a pic of the back? I am curious as to the hardware. I have not seen that hull. I just want to make sure it is all good. Was this thing gas/nitro before?
Member
here is a pic of the back20161027_145338 (360x640).jpg thanks again for the help.
Member
this was originally setup for a gas motor it never had a motor in it. hope u can see the pic it's kinda small don't know how to make it bigger.
Member
i was looking on ose sight they show a tp 4050 1330 kv or a 4060 1050 kv then go's to 1650 dont see a 1180 kv witch would you recommend for 8's.
Not there yet
Well there is a 4050 10D wind at 1180kv and a 6Y at 1050 on TP's site.
Also a 1280 Y wind as well as the 1050 Kv on TP's USA site in stock. I think I would go 1050kv. A Y wind will yield better runtime where a D has more torque, FYI.
Fast and Furious
Actually there is almost zero difference it performance between Wye and Delta winds. The misconception that Wye motors are amp hogs etc. is based on comparing motors with different Kvs (the 1527/1Y versus the 1527/1.5D is a common one). Bottom line, lots of testing by high performance airplane guys has shown little to no performance/torque/amp draw difference if the Kvs are the same.
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Not there yet
I stand corrected. See still learning. A never ending process in this hobby.
Member
Ok think i will order a couple 1050's and a couple esc's and a selection of props. maybe i can test a little before ice sets in
thank's again for all the help! ie ( never stop learning and will never know it all )
Member
another question is there an advantage to running 3 blade prop vs 2 and lift vs no low lift (x vs m) style. for my app.
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