BL choice for Funjet

[jamesg25]

Hi all
I have bought a Hacker B20 18L for my fun jet, with a 30A hacker ESC, 2200mah TP 3S lipo, is this setup suitable for a funjet?

[Unorthodox_Sniper]

Hi James,

yes the motor is suitable for funjet and it can also be used for the pylon sokol. but this is a 3086kv motor so you need to keep the prop small (try APC 5x5 prop for a start) to keep it within 30A. Try to borrow a wattmeter if you can to measure the current drain on a prop. don't fly alone as this is a delta wing plane so it's flying characteristic is different from your normal planes.

I suggest you build the plane first and come join us this coming weekend at bedok field. I have wattmeter & many speed props for you to try out the best combinations.

If your dad is not free to drive you to bedok field this weekend, let me know as I can ask my friend to give you a ride since he stays nearby your area.

We have great success on flying the funjet on 4s lipo too, so if you want more speed without increasing the current drain you can consider that in future. but your motor & esc must be able to take the 4s voltage and watts.

[jamesg25]

the only thing i'm concerned about is what happens if i put 30A through the motor... can it take it

[domwong]

I think the B20 may be a little small for the funjet. I'm using Mega 4T and 6.5x5.5 prop to drive it. 20+ amps draw...

[Unorthodox_Sniper]

you are right. I didn't know the B20 18L has such a low current rating of only 12A continuous or burst of 18A. more info at:

http://www.hacker-motor.com/images/Catalog06/Hacker-2006-Page-14-15.pdf

while you can still fly the funjet with this motor you have to use a small prop but the plane will fly slow and poor thrust and you need to keep the plane really light. the wattmeter will come in handy to ensure that you do not exceed 12A. but this motor will work on sokol well because the airframe of sokol is so streamline and efficient (as compared to funjet) that you do not need a high watt power system to fly the sokol fast.

btw I just received shipment last night for a killer outrunner motor that can go 100mph for funjet on 3s. we will be trying it this weekend.

[Unorthodox_Sniper]

I think the B20 may be a little small for the funjet. I'm using Mega 4T and 6.5x5.5 prop to drive it. 20+ amps draw...

hi domwong,

where do you fly your funjet?

[$h@d0w]

I think the B20 may be a little small for the funjet. I'm using Mega 4T and 6.5x5.5 prop to drive it. 20+ amps draw...

My Funjet on Mega 4T on 6x4 is drawing around 24A static. 6.5x5.5 should be close to 30A.

[domwong]

Correct. 20+, closer to 30amps...

My Funjet on Mega 4T on 6x4 is drawing around 24A static. 6.5x5.5 should be close to 30A.

[domwong]

Sir, I fly my FJ anywhere as it goes into the boot very easily. Usually big open fields. Away from the crowds as I dont to risk a fast jet hitting anyone...

I once fly the FJ at a soccer field near Tanglin. The field is surrounded by tall trees and is in a mini-valley. It's very quiet there and the sound (and echo) of the motor noise is dammed shiok!!

hi domwong,

where do you fly your funjet?

[jamesg25]

hmm... this is quite interesting, as the fella from ntc recommended this motor to me for a fast flying funjet, which is obviously complete nonsense, i will see if i can get a refund on it, and order a mega or one of your motors unorthodox 100mph sounds good

[randomtask]

I'm trying out these microdan speed on my lightweight FunJet. Will give a flight report if the motor doesn't come flying off in mid air.

Cheers
Adnan

[jamesg25]

hello gentlemen,
i managed to get the hacker refunded from ntc, and i've borowed a friends mega 16/15/3 which is rated for anything upto 30A and moto calc says that i'll be drawing about 22A with a 5x5 on 3s 2100mah, tp lipos. should also be able to generate pretty good speed, aswell as sufficent thrust. will let you know when bird is ready, and will pay a visit to the JW field
thanks for your help... so far

[$h@d0w]

hello gentlemen,
i managed to get the hacker refunded from ntc, and i've borowed a friends mega 16/15/3 which is rated for anything upto 30A and moto calc says that i'll be drawing about 22A with a 5x5 on 3s 2100mah, tp lipos. should also be able to generate pretty good speed, aswell as sufficent thrust. will let you know when bird is ready, and will pay a visit to the JW field
thanks for your help... so far

22A on a Mega 3T on 5x5 is on the low side. You might want to drop a little down to 4.75x4.75 and use an amp meter to measure.

[jamesg25]

yeah, sorry not 22A predicted, 28A predicted, on the 5x5, the predicted for the 4.75x4.75 is 24A. the pitch speed is actually the same, just a reduced thrust, so yeah, ok i'll give a that prop a try!

[fuse]

mega 3 on 475x475 is around 30 ~ 32amps using tp 2100