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Ducted Fan intakes?

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SIMON CRAGG05/03/2018 20:14:43
544 forum posts
15 photos

What are all you guys using to prevent FOD from being sucked up into the fan?.

Seen a few postings about cutting out sections of a metal sieve, is their a "standard" way of doing this?

We fly from a grass strip and I am concerned about grass / debris being sucked into the fan.

Thx in advance. Simon.

J D 805/03/2018 21:34:57
1391 forum posts
79 photos

Anything in front of the fan will reduce performance to the point that the aircraft will likely not leave the ground.

Never found a few bits of grass being a problen,they just go straight through.

FOD guards are for jet turbine engines.

Denis Watkins05/03/2018 21:48:39
4198 forum posts
85 photos

We experimented with this at my place Simon, and any mesh strong enough to withstand the airstream

Reduced power by about 10%, which as JD points out, added a negative dimension to take off.

When in the air, where the filter is no longer needed, performance was affected.

Just take your chances without, as most DFs are only on the ground a couple of seconds

SIMON CRAGG05/03/2018 22:17:39
544 forum posts
15 photos

Thanks for that Denis. I am very surprised that a sieve type mesh would reduce the power by that much, as it does not seem to reduce the air flow at if you try blowing through it. I was thinking of something with about a 5mm square mesh that would stop small stones etc. Next stop would be the kitchen!.

Martin Harris05/03/2018 22:33:40
9171 forum posts
242 photos

I once made the mistake of trying to taxi a hand launched EDF on clean and well maintained wet grass to save a ten yard walk - half a second after opening the throttle there was an almighty clatter and the impeller blades were all gone...

Edited By Martin Harris on 05/03/2018 22:34:18

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