KK Venom EDF

[3view]

KK Venom, as yet unflown under power but test glides look promising.

Note the cheat holes in the nose that look awful.

Note also that I can no longer tissue cover since using the last of my Esaki.

Steve

[DHnut]

A great subject Stephen. Have you tried the Dilly tissue? Provided it is not used wet it works well and is strong. I have used it and have had good results using dope to shrink and attach.
Did you consider using a cheater hole under the nose in the weapons bay?
Ricky

[3view]

Hi Ricky,

I did try Dilly tissue ages ago but did not get on with it, must try again with more determination.

I avoid cheat-holes like the plague. However in this instance I thought I could engineer an almost perfect, straight-through, duct to give the KP 18mm fan a fighting chance.

Steve

[3view]

Here's a picture of all the gubbins.

N to S is the duct and the KP 18mm edf unit
NW is a 160mAh single cell.
NE is a 6A esc.
SE is a 160mAh single cell.
SW is a KP DF18 timer.

All the wiring is kept to the minimum. AUW ready to fly 41g.
The EDF unit sits in a cradle and is held in with sticky-tape to facilitate easy removal at the field to clean out debris.

Steve

[dosco]

Steve:
Perhaps spring-loaded cheater holes? Less obvious and less gaping.

Still, she's a beaut!

Best-
Dave

[3view]

Thanks Dave,

I was thinking about a moulding a cover that could be quietly removed before and quickly replaced after each flight?

Possibly there might be enough performance to use scale bifurcated intakes, that would be nice.  Won’t know until I see the thing fly under power.

Steve

[Gary Dickens]

Perhaps you could cut away the black dash area and remove the flat portion of the windscreen.
Gary

[3view]

Gary,

I'm not a lover of cheat holes as they are not efficient. The nose intake on my venom makes for quite a straight run for the incoming air, which should be quite efficient.

Ducting should be smooth straight and with a constant volume so the air does not speed up or slow down unnecessarily within the duct.

Steve

[kaintuck]

could you point me in the direction to get one of these small EDF units your using?
 :)thanks
Marc

[3view]

Mark
Contact details can be found here.
http://kpaero.com

The 18mm fan is not listed on their website.  Might be worth looking at the DF18 timer for a very lightweight setup, again not listed on the website.

Steve

[Pit]

I got a couple of the 30mm units three years ago, and the bitty ones were still listed.  Wanted to order a couple earlier this year and was also disappointed that they were no longer listed.  Maybe a message to Derek will help.  He has been known to provide "discontinued" items on special order.

[3view]

I've had my 18mm fan for a while now, so I don't know if they are still available?

Here's a picture of the trim tabs needed. The Venom has downthrust right sidethrust and left rudder for a nice wide LH circuit.  Video to follow when it is uploaded.

Steve

[3view]

https://vimeo.com/manage/videos/733958296

Video of a short flight.  Nice circuit, too much downthrust is stopping the initial climb.

This flight is using about 3/4 throttle.

Steve