Hip Pocket Builders' Forum

Outdoor Free Flight Forum => EDF, Jetex or Rapier Powered Free Flight Jets => Topic started by: steve h on March 14, 2018, 05:48:08 PM



Title: KP 18mm duct fan
Post by: steve h on March 14, 2018, 05:48:08 PM
Hi all
I need a bit of advice on where the 3 wires on the ducted fan go on my KP speed/timer unit
hopefully someone can help
cheers steve


Title: Re: KP 18mm duct fan
Post by: 3view on March 15, 2018, 03:18:09 PM
I think that the 3 wires from the fan goes to a speed controller.  The timer then plugs into the Futaba type connector on the speed controller.

I haven't played with the 18mm fan and can't find any specs on the internet, just keep things as light as possible.

Here's a picture

Steve


Title: Re: KP 18mm duct fan
Post by: mike on March 16, 2018, 05:12:59 AM
The unit has a brushless motor.  The three wires go to a 'brushless motor speed controller' (aka a brushless ESC).  The three wires can be connected in any order to the speed controller.  Just plug it up and try it.  If it goes 'backwards', swap any two wires over and it will go 'forwards'.


Title: Re: KP 18mm duct fan
Post by: steve h on March 18, 2018, 03:25:59 AM
Thanks for the help


Title: Re: KP 18mm duct fan
Post by: fred on March 30, 2018, 11:55:33 PM
Actually.. looking at the parts pix... Fit an Rx instead of that "timer' 
Likely same weight/size if not Smaller... then You can control the engine from your transmitter.
Useful when one needs save their model :-0


Title: Re: KP 18mm duct fan
Post by: Kiwi on January 19, 2020, 09:47:30 PM
Here is the info sheet from my 18 mm EDF

What model do you have in mind for it? I'm trying to decide on a subject for mine


Title: Re: KP 18mm duct fan
Post by: Kiwi on February 21, 2020, 11:37:27 PM
Been looking at all sorts of models for indoor with my 18 mm fan, current top contender is the AM Miles Student (https://outerzone.co.uk/plan_details.asp?ID=2004) I've have blown the plans up and am looking at using depron formers and Davis Rees style wing construction to try and keep the weight down. Plenty of fuselage space to hold the battery and ESC/timer, and a nice short exhaust, just may need to deepen the intake duct a little.
Mind you, like all project lists, it is subject to change (often) :)


Title: Re: KP 18mm duct fan
Post by: steve h on February 22, 2020, 09:21:23 AM
Hi kiwi
The miles looks a winner to me
I've put my ducted fan project on the back burner for a bit but looking at the miles it has give me some encouragement
Initially I brought a panther kit but I think it's more for outdoors
Cheers


Title: Re: KP 18mm duct fan
Post by: billdennis747 on February 22, 2020, 10:29:24 AM
Derek Knight's Student


Title: Re: KP 18mm duct fan
Post by: Kiwi on February 22, 2020, 10:43:44 AM
Hi Steve, Derek (of KP Aero) built the Student with the 24mm fan and says it flies very well outdoors but doubted the 18mm would be powerful enough, but mine will be strictly for indoors and I hope to lighten the structure considerably, hence the thought of depron  (or reed) formers and Rees wing. Will also be cautious re balsa selection.Fingers crossed that it will be a flier
 I am fortunate in that I have weekly access to a sports centre which has space for 16 netball courts so sort of have the best of both worlds, outdoor space indoors!
For my first attempt I wanted ample fuselage space and short straight inlet and exhaust ducting. I looked at the Heinkel He 162 on Mike Stuarts site but the Student has bigger wing area so should fly a bit slower so plumped for that, After the Student I will look at some of the Keilkraft models. (I like the Panther too and the Skyray).

Nev


Title: Re: KP 18mm duct fan
Post by: steve h on February 22, 2020, 11:25:11 AM
Hi Nev
Good luck with the build
That sports hall is a monster your very lucky to have a site that big
The average size here in the south of England is 4 courts so anything over 18" is a bit of a squeeze
Cheers


Title: Re: KP 18mm duct fan
Post by: Kiwi on February 28, 2020, 03:14:19 AM
Made a start today on the Student today and cut the 12 formers from foam meat tray, 1/8" thick, was most pleased when the twelve of them weighed in at only 7 grams.
I will use balsa for the horizontal crutch.
Steve, here is a photo of our site, the courts are divided by nets which can be slid back out of the way, it's just a matter of avoiding the uprights.


Title: Re: KP 18mm duct fan
Post by: billdennis747 on February 28, 2020, 05:01:49 AM
it's just a matter of avoiding the uprights.
I like that optimism!


Title: Re: KP 18mm duct fan
Post by: PaulM on March 01, 2020, 11:47:10 PM
Hi guys
   Im just finishing up a Saro flying boat with 2 18mm fans, design is from the old Wilmot Mansour ,Jetex kit, contruction is done , just needs painting and decals and things, ill post pics when its done , any questions  im happy to answer