feigo 9xl in tunnel

[crazzy maxx]

hey im in the process of ordering parts for a aquacraft vs1 electic conversion and was wondering if a 9 xl is to much...
this is my first electric tunnel so im kinda anewb to pwer for it...
thanks
brett

[Avanti]

talk to obrien he has done a few tunnels

the XL might be a bit tall for an o/b
most guys run the stock SV27 set up for tunnels

[mtgoat]

I'm also building the VS1. I'll be using the SV27 motor and ESC as soon as the new one's available. I also considered the 9xl, but thought it would be too tall.

[alvinsmith75]

http://www.youtube.com/watch?v=kfEg7NWz5lw

Here is my top speed II on 8xl. The xl motors actually worked better for me because of weight for balance point.

[crazzy maxx]

http://www.youtube.com/watch?v=kfEg7NWz5lw
Here is my top speed II on 8xl. The xl motors actually worked better for me because of weight for balance point.

very impressive...

i thhnk im gona go for the 9xl or 8
yea i see everybody has the sv set ups im going to be racing my dads tunnel so i need a big motor...
what prop where u using?

[obrien]

If I was going to build a tunnel that size, I would do it to run in the OPC spec class with the SV motor and esc. However if it was just to play with, I woud opt for a higher KV motor that will turn up some higher rpms than a 9xl will. you can cetainly turn a larger prop with the 9xl, but the VS1 is a smaller tunnel so you don't need the power of a larger motor. If anything I think I would go with the ammo 2300 on 4s. that will probably be plenty fast and it will take a little bit of time to get it dialed in.

Keep in mind that with the 3.5cc size lowers you will be limited on diameter. With the larger 8 and 9xl motors you will want more diameter to get the most performance.

What setup does you dad have?

[crazzy maxx]

he has a prather tunnel w/ a 7.5 cc k&b ughh nitros!
i hvae two 11.1 v lipos on the way . may run them together...
a 9 xl w/ abarracuda 125 esc on a fuller carbon leg...
what prop do u think would get it going

[obrien]

are you going to run it as 3s or 6s?

[crazzy maxx]

i may run both 3s at once and when fooling around not going for speed ill run one

[obrien]

Well on 3s, I would say that you are looking at a low 30 mph boat, on 6s who knows what it will really do. You probably will have a hard time keeping it on the water. 4s is going to be the best all around. Not too mention, you may not be able to get 6s in the boat.

[crazzy maxx]

well i have a 4s1p some where in my house lol if i find it ill try it.i would moun the batterys where the gas tank would be on top of eschother... i think it would fit.
so u guy think a 9 xl and what prop?

[mtgoat]

so u guy think a 9 xl and what prop?

I think that you will be limited to a max diameter of 40mm with the outboard, if I'm not mistaken. I have the carbon lower leg from Fullers in front of me and that's the measurement I'm getting. Maybe someone could verify this. I haven't assembled anything yet.

[crazzy maxx]

the 9xl has a diameter of 35.8...
Motor Specs:
6-24 NiMh or 2s to 6s Lipo cells in a medium to large sized mono or hydro.
1000 Watts Maximum with proper cooling.
35.8mm dia x 75mm long
5mm Output Shaft. Use 5mm Couplers.
372 grams
50,000 rpm bearings!
Aluminum Purple Anodized Casing
2-Pole Neo Magnets & Compressed Windings

[obrien]

maxx he wasn't refering to the motor diameter. He is saying that you will be limited on prop diameter, which is what you will need with the larger low KV motor.

[crazzy maxx]

o my bad lol
what would you recomend fr top speed ... also mydads tunnel is doing about 45-50 mph ide liek to be in that rannge.
ammo with what prop?