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

From: John Gallagher <gldrgidr@...>
Date: Tuesday, February 28, 2012 10:48 PM
Subject: Re: [BugHLG] Modified Bug Plans - Any One Keen?
I just started learning CAD to do this but go for it.  PDF files are very easy to print or have printed by a copy shop.   Because I want the lightest weight possible, I wouldn't go for the half ribs as long as the original rib spacing is kept, but if it is optional it won't hurt.   <<Optional rib templates for secondary wing with upper camber reduced by 6.5% to help with launching height >> Not sure what you mean by this.  You are probably talking about reducing the thickness of the airfoil. If that's it, then 6.5% is probably too thin without a lot of wing structure redesign to get leading edge sheeting. I'd go with 7.6 to 8%.  The stock thickness is around  9%.  This is a mod I wanted to include.  Was going to purchase Compufoil to do this, but I'm low on funds right now.  You can't just lower the top surface and expect good results.   If you are putting a peg in the wingtip then the cruciform tail should be stock and the V-tail should be optional or not included at all.  SAL launching is much better with the + tail.   I would increase the length of the fuselage nose 3/4".  Mine is actually 1" longer.  Make sure you show the servos forward of the wing - All radio gear in front.  This helps with balance for the cruciform tail.   I have not had much luck with ultralight servos.  Their gears strip very easily (especially with SAL launching) and you will probably need some weight to balance the tail anyway.  Four grams servos seems about right.  Of course your Bug's tail may be much lighter than mine.    The stock pushrod setup is very light but has slop in it.  You will probably need a rudder preset for your launches.  A better way is to install the pushrods  running outside of the boom on either side.  Look at the photos of Rick's Bug to show how to do it.  Rick gets great launch height with his bug and I think this pushrod setup helps a lot. It's up to you to decide if you want to include this on the plans.   Suggest you call it a Bug 34. I also thought about drawing a one meter Bug.  For that you would definitly want to lengthen the boom.   John     ________________________________ From: Squid <littlefr2003@...> To: BugHLG@yahoogroups.com Sent: Tuesday, February 28, 2012 3:07 AM Subject: [BugHLG] Modified Bug Plans - Any One Keen?   Hi every body out there! I have been trawling through anything i can find bug related regarding possible modifications, i have decided to redraw the plans with all the suggested updates. So here is what i have changed on the plan. (please let me no your thoughts and if you think there is anything else that should be modified) Once i have some feed back i will release it to the world in what ever format. pdf dxf tif jpg what every anyone wants. WING:• Has been taken out to 34" (one extra rib)• Main carbon spar runs out to the end of the wing for SAL/DLG• Location for launch peg marked with strengthening mount (left or right)• Optional half ribs to help against rib compression and to give the airfoil better shape• Optional rib templates for secondary wing with upper camber reduced by 6.5% to help with launching height FUSELAGE:• Has been slimed up as modern electronics are smaller• Fuselage has been lengthened by half an inch• Boom is now 1/8" rather than 3/16"• Tail area is now 15% more. Similar to wing area increase• Crucifix tail will also be on the plan as an optional ELECTRONICS:• 2 x 2.5g Servos Link <http://www.hobbyking.com/hobbyking/store/__3714__HobbyKing_2_5g_17kg_12sec_Micro_Servo.html> • Orange receiver 2g Link <http://www.hobbyking.com/hobbyking/store/__18827__OrangeRx_R415_Spektrum_DSM2_Compatible_4Ch_Micro_2_4Ghz_Receiver_.html> • Lipo Battery 1s 220mAh 6g Link <http://www.hobbyking.com/hobbyking/store/__19613__HK189_HK188_Battery_3_7V_220mAh_.html> OR• Lipo Battery 2s 120mAh 8g Link <http://www.hobbyking.com/hobbyking/store/__19422__Turnigy_nano_tech_120mAh_2S_25C_Lipo_Pack_E_flite_micro_series_compatible_.html> So any feed back would be greatly appreciated!! [Non-text portions of this message have been removed] [Non-text portions of this message have been removed]