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Old 02-03-2011 | 10:33 AM
  #6  
texzen1
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From: Austin, TX
Default RE: 2m Pattern Plane Weight Problems

Dave...thanks for the reply.....scale is industrial electronic and calibrated with standard at 11 lbs. <div></div><div>Here in my nievity was my simple comparison of electric vs. glow.</div><div></div><div>My Motor 696 grams. Same range as many used on F3A. </div><div>My Batts 666 grame each (same batteries used by many) +/- 50 grams of 90% available</div><div>My speed control 100 grams (average for its size)</div><div>70 grams of wire and connectors</div><div></div><div>So Electric setup 2185 grams (4.82 lbs)</div><div></div><div>Published data on Glow</div><div></div><div>YS 170 DS 980 grams</div><div>CDI ignition 100 grams</div><div>Hatori Header 157 grams</div><div>Empty Tank and Fuel Line 100 grams</div><div></div><div>So Glow setup 1337 grams (2.94 lbs)</div><div></div><div>So by calculations glow is a 1.88 lbs savings....and some of these newest top end electric motors coming out are even heavier... </div><div></div><div></div><div></div><div>I assumied motor mounting would be similar in weight....and a slight further disadvantage to electric swinging more prop than glow....</div><div></div><div></div><div>Am i missing something....I just dont see how with an almost 5 lb drivetrain ill ever get 2m/sq of plane to 11 lbs....

Plane "FORTUNA" is also sold under the name Sword II or Swordfish... I only know of one flying that i have seen in person and it was reported at 12.2 lbs with OS 170. I am beyond really being able to compare individual airframe component weights since my build i s almost finished...It came out really nice looking and doesn't seem heavy in comparison to my other planes of similar size...just never going to be an 11 lb plane i guess...</div><div></div>