42" Cat build

[TotalPackage]

Can we see video of your 80 mph setup with the equipment you have . I leave it in your hands to show us all that it can be done with mismatched brand 8xls and a 80 hv. Im done

Im waiting to see this

[DV8ion]

I'm not trying to hit 80. I'm happy if I see high 50's or even a peak into the 60's on the right prop.

[tiqueman]

@TotalPackage
The equipment han't shown up yet. but you guys say I might hit 40??
My Genesis in this YT vid is already doing 40+ mph

http://www.youtube.com/watch?v=LfdviE48euY

10xl. I already have two 8xls and a 6xl.

W/ the equipment you have coming and using a 10XL, with the 430 prop your thinking of using, you will be less than 40mph. And you will pull hardly any amps at all (under 40A). You could go a bit larger on the prop to get above 40mph, but the closer you get to say a 40mm diameter, the closer yo will be to pulling over 80A. If you opted to put another $50 into it and get for example the 120A Turnigy esc, you could swing a larger prop such as a 442 and maybe get close to 50. It all depends on the efficiancy and power of the motor you are using.
Im getting this data from plugging numbers into FeCalc, as well as its similar to what I had at one point in my Genesis.


Now, on another note, for a single power plant, the XL, from first hand experience, I feel is too small a motor. Something w/ a bit more meet behind it will push it a bit more efficiently. When I ran mine w/ the stocker (approx 8XL) I could get it in the low 40s on 4S, but it came it pretty warm after a short run. Going to a Leopard 4074 size can helped a lot and at 55mph it would come in under 110F.

[tiqueman]

I'm not trying to hit 80. I'm happy if I see high 50's or even a peak into the 60's on the right prop.

A club member is less than a mph from 60. His set up f.y.i., Genesis hull, Castle 1520, Turnigy 180 w/ extra caps, 6S, M445 prop. Its a little "torquey" w/ that size prop and developed some interesting characteristics, but it flat out hauls a$$. Its identical to the set up I had in mine before I let it go, but I never worked up to that prop. I ran a 442, I think, and was in the mid 50s. 110A.

[DV8ion]

My setup is a 32" cat, 4s2p 40c, Leopard 4074 2200kv, T180 esc and gonna start with a 442 prop

[tiqueman]

Fantastic set up. You will be pleased w/ it. I dont think you will have to struggle too much to break 60.

[LarrysDrifter]

This is one of the most interesting threads Ive read in a while. Im ready to hear about what happens with an improper set up done by someone who wont listen. This is going to be good.

[tiqueman]

This is one of the most interesting threads Ive read in a while. Im ready to hear about what happens with an improper set up done by someone who wont listen. This is going to be good.

Dissapointment, followed by frustration, or vice versa...

[DV8ion]

Fantastic set up. You will be pleased w/ it. I dont think you will have to struggle too much to break 60.

Thank you If anyone is wondering why I am posting here. Sven is a buddy of mine and we plan on running together this season. And I know he is hell bent on going faster than me. He is just trying to do it on the cheap. As for his idea of 80mph on a budget HK stuff.....it won't happen IMO. I'd like to see him have a reliable boat so it is a more enjoyable outing, but to each their own.

[tiqueman]

I have more fun running w/ friends w/ the same set up than I do w/ people running completely different options. It makes racing that much more enjoyable as well as really teaches you how to dial in and tune your boat. Plus, its fun to do work to your boat and the next time out, your 2 mph faster than he is, yet everything still "looks" the same. Its amazing what adjustments and prop tweaking will do.

[siberianhusky]

LOL usually people are trying to spend their way past you! I honestly think this is the first time I've heard of somebody trying to cheap their way past!
I completely understand having a budget but most people accept the limitations imposed by the budget and try to build something as fast AND reliable as they can. The way I look at it if you're on a budget then replacing stuff isn't much of an option, and if not then why not spend the money right the first time?
There are two key things you can't buy set up experience and driving skill, they will beat you every time!

[keithbradley]

If you are dead set on running the 80A HV ESC in a single drive setup, here's what I would reccomend to get you in the 60 mph range, on a very low budget:

*80A HV ESC

*Tacon 3674 1300kv inrunner (available at hobbypartz for less than $60...put a water jacket on it too)

* Sharpened and balanced m440 prop

*2 X 4s 45C lipo in series for 8s

This setup should get you pretty close to 60 and possibly work with a 80HV. You will definitely want to run loose to keep amp draw down, and you will be testing the limits of the esc. I run the same motor/prop on my 32" cat and it pulls a peak of 117A, and thats running pretty wet. I am also getting around 15 minute runtimes with 5000mah.

[Blackjack-sven]

I'm not dead set on the 80hv, its just whats on its way from hk.
I'm more set in running 8s on a 1600 or 1500kv motor.
I'd rather see 35000 rpm and 60mph than 60000 rpm and 40mph

[keithbradley]

1300kv on 8s will get you about 40,000RPM and 60mph with a m440 if set up properly.

I have a video of one of my boats with that exact setup but it was in 30 mph winds so the majority of the time was spent at light throttle.
I just told you 60mph on an 80A esc with 15 minute run times. Most people wont even believe those numbers. You will have a very hard time doing better than that!

If you want to run 8s on a 1500kv motor you are going to need a much better esc ($300 range for a cheap one) and a better motor. Even then you wil have a setup that can go up in flames at any time. Ever heard the saying "You got to pay if you wanna play"? If you want a cheap setup that will go fast, I posted one.

[Blackjack-sven]

BTW: what would this setup pull amp wise?

7s, 1500kv, x447