Belt CP 450 question

[Greywolf74]

What size ESC and motor should i be looking at for a 450 sized Belt CP. Also what about the Slightly smaller Honeybee King 2? Not sure what size it is...I'm guessing about a 400 since its only a little bit smaller than the belt CP.

 

[Greywolf74]

General idea what Amperage ESC to buy for a 450 heli? I know I want to get a castle system but I'm not sure what size motor to get or what Amp range I should be looking at

 

[Rolex]

Here's a list of stock parts as well as upgrades, including motors and batteries.

http://www.xheli.com/eshobeekiii.html

 

[Greywolf74]

Thanks for the link Rolex.

So I have 2 more questions. I'm assuming that heli motors are basically like car/truck motors where anything in the ball park KV range will work as long as the can fits the kit as you can make up for less kv with a bigger pinion. Correct or not?

Also I see some motors are outrunners and some arent....what is an outrunner?

 

[Rolex]

The can of the motor rotates around the armature.
Your best bet is to stick with the stock settings since small changes might also require different rotor blades.
Wrong gear ratio and you can hardly get it off the ground or you have too much head speed. Either way, you're working the motor much too hard.

 

[Greywolf74]

oh wow I didnt realize that.....so what should I do in this case where the stock motor is a 40g esky 3100kv motor and hobbypartz and xheli are out of stock on that exact motor? is it ok to use a 56g 3800kv or is that gonna throw thing off to much? IDK if esky is sold anywhere else but I will look around to see if anyone else carries those parts but I'm curious if thats to big of a change. the can size is only a couple mm bigger.

So how does one go about learning how to properly make gearing and rotor changes or is that something that generally no one does? I guess I'm just used to cars and trucks mentality of if it will fit you can make it work by adjusting your pinion size. I would like to know how to eventually figure these sort of changes out for myself unless 90% of the population just sticks withwhatever the stock set up is then maybe I wont worry about it.

I'm sorry if my questions are annoying its just like learning any sort of new RC field you have to figure everything out all over again heh. Thanks for the help.

 

[Rolex]

Here's a few photos to show you some changes that had to be made:

This one needed to be re-geared to handle the extra load of the 4 blade rotor and the weight of the fiber glass body and retracts I added.
It's a 450 but it's sitting next to a 500 canopy. Lots of added size and weight.

Here's a heli I built as a bare bones kit. It didn't need much, but I ordered some overkill parts for a future upgrade. It was originally intended just for a canopy.

The basic canopy heli certainly didn't need the 75 amp ESC, but the next addition did.

Here's the difference in gearing from the 3-D black gears to the scale white gears needed to lift a 500 sized fiber glass body.

Although the real Apache AH-64 has a 4 blade rotor, I had to sacrifice that part of the scale look because there's no way this would get off the ground with this much weight and the additional drag of 2 more blades.

 

[Greywolf74]

Wow that Apache is freakin awesome!

Ok so I've been looking at various motors and one thing I've seen is there are some motors that are very similar to size and stats as the one thats in it only they have shafts with a 3.17mm diameter and the stock motor has a 2.3mm diameter shaft. So does that mean it wont work or does that just mean Id have to buy a new pinion in order to use that motor?

Speaking on pinions. what are the various gear types for heli's? Like ground uses either 48p, 32p, or mod1 and rarely something like a mod 1.5

Thanks

 

[Rolex]

The frame has adjustment slots to vary the pinion sizes, but I don't know if the shaft size would have an affect on the proper mesh.