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Old Nov 15, 2003, 03:00 PM
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United Kingdom, Bracknell
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Brisk 280 - fully aerobatic ARTF parkflyer

Test flew my Brisk 280 today - what a blast! ROG from soccer pitch grass, flew 17 mins till it was too dark to see it properly ... still doing vertical climbouts at that point. 3S E-tech 1200 pack was at 11.06V after landing so a fair bit of duration left I think.

I am using a Hacker B20 26S 4:1 with APC-E 8x6. Hacker Master 8A ESC, 3 x Waypoint W-060 servos.

Here's the manufacturer's site:

http://www.hacker-model.cz/news/brisk280.htm

And an earlier thread on this model:

http://www.rcgroups.com/forums/showt...hreadid=124823

I got mine from Cambrian Direct in the UK:

http://www.cambriandirect.com/

Plane is fully aerobatic, huge ailerons give a hilarious roll rate (I'm using 40% expo) and all-flying V tail halves for pitch and yaw. Fully symmetrical wing section. My AUW is 317 grams or 11.1 oz, wing loading is 8.4 oz ft sq. Very docile at low speed, nice model.

I have made a few mods from stock, will post details & pics later.
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Old Nov 15, 2003, 03:02 PM
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Quite a long tail moment
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Old Nov 15, 2003, 03:04 PM
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United Kingdom, Bracknell
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Stock motor mount is attached to the firewall, neat (sets side and down thrust) but no motor cooling whatsoever since the motor is inside the plastic moulding! The cowl is just cosmetic and is taped on (as stock).
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Last edited by Bill Glover; Nov 15, 2003 at 04:44 PM.
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Old Nov 15, 2003, 03:07 PM
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The cowl is a pretty substantial moulding, I decided to mount my motor directly to that instead (and cut the supplied mount off the firewall). Glued a mounting disk inside the front face and opened up the air intake below it (this is upside down).
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Last edited by Bill Glover; Nov 15, 2003 at 03:14 PM.
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Old Nov 15, 2003, 03:08 PM
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I made up a duct from thin plastic sheet, this diverts the air up over the motor can.
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Old Nov 15, 2003, 03:12 PM
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Glueing the cowl on, I used Araldite for this (24 hr epoxy) for max strength and to give plenty of time to get everything lined up! The 12" prop is just to check the sidethrust ... bit big for a B20
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Old Nov 15, 2003, 03:13 PM
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Stock u/c is intended for use with a Gunther prop, bit small for me!
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Old Nov 15, 2003, 03:53 PM
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Hampshire, UK
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We had one of these fly at an indoor meet last month flew pretty good with a GWS IPS and Nimh's; still very fast though and eventually bit the dust.

--
Dave
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Old Nov 15, 2003, 04:11 PM
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Not my idea of a good indoor model really!

Stock u/c clips into an ABS moulding on the front of the fus. former, I cut this away and used a py plate and bolt to clamp and epoxy 3mm carbon legs there instead.
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Old Nov 15, 2003, 04:13 PM
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Tack glued a length of 2mm carbon rod across to make the axles
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Old Nov 15, 2003, 04:15 PM
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Bind the axle/leg joints with carbon tows, soak with thin cyano, cut the centre part of the axle free when dry
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Old Nov 15, 2003, 04:16 PM
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Finish off with a pair of the superb ultra-light wheels from Air Craft
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Old Nov 15, 2003, 04:19 PM
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V tail is supposed to have 1 servo (elevator only), plastic tubes are fitted to take wire rods. Mine looked like it was going to be nose-heavy so I decided to mount the servos in the tail and drive the surfaces directly. Here's the 2-servo 'brick' I made up, before installing.
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Last edited by Bill Glover; Nov 15, 2003 at 04:45 PM.
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Old Nov 15, 2003, 04:20 PM
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Finished tail section. The metallic blue trim was the nearest match I had to the covering
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Last edited by Bill Glover; Nov 22, 2003 at 07:47 AM.
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Old Nov 15, 2003, 04:23 PM
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Speaking of the tail. The wire pivot rods were not properly fixed on my tailplanes - they just pulled straight out! So I replaced with carbon rod (saving some weight).

Original wire pivots at top, carbon rod below (before cutting to size).
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