Archive of the Yahoo! Groups mailing list for the Bug hand-launch glider 2002-2018

From: Tim Schuh <tim@...>
Date: Saturday, April 10, 2010 12:15 AM
Subject: Re: [BugHLG] Re: BUG HLG
On 4/9/2010 5:04 AM, dirk1951 wrote: > If a Bug of 50 gram's fly well, I do'nt Know, but with a wingload of 5,5 gram/DM� (1 3/4 ounce/sqr. ft) it's very light for that size ... less mass to buildup speed, so it can only fly in very calm weather (without termals) ... even with a little breeze your flying speed will be less then the wind speed ... > > And another "problem" I expect is ... with the proposed gear you never get it balanced ... so you had to build a (much) longer nose and/or use a very lightweight (and more vulnerable) tube for the tailboom ... and I also doubt of the flimsy linear servo's on de Spektum AR6400L (or the cheaper version from Vapor, same electronic's only some extra's are missing) will survive the harsh live of a HLG ... > > I think you can better invest in a couple of robust (sub) 5 gram servo's like the Dymond D47 (or Robbe FS31), with a little reworking, remove all unnessesary plastic and replace the cable and connector for the shortest possible with a JST connector, the total weight per servo will be less then 4 grams ... together with a Spektrum AR6300 ... the total RC, without batteries, will weight 10 grams ... if you are lucky it will operate on a single (high C) LiPo cell a 180 mAh weights arround 5 gram ... and if you can still get them 4 x GP 70 mAh NiMH cells are less then 10 grams on the scale ... > Well, how about this then. If the AR6400L and the attached linear servos are too flimsy for hand launch, how about launching it from a mother ship. Say the previously mentioned Vapor in an appropriately sized gigantic building? Get a bunch of hotheads stand in the middle of the floor and use them to generate thermals? :) Tim