RCU Forums - View Single Post - Designing a new pattern model
View Single Post
Old 09-16-2010 | 12:43 PM
  #164  
Alex Voicu
 
Joined: Aug 2006
Posts: 520
Received 62 Likes on 28 Posts
From: Trollhattan, Sweden
Default RE: Designing a new pattern model

Thanks everyone for the kind words, i really appreciate it.

Wheelpants would look great indeed but i need to save weight where it's possible. I attached a few shots of the interior and the weight list, so please let me know if you have any ideas for saving weight.

The Scorpion S5525-225kV motor is very powerful, on a fresh set of batteries and using a 19x12 APC propeller i had 3600W on the wattmeter so i had to limit the throttle curve at 92%. I'm still getting 3200W but at least the current dropped to an acceptable value during static tests (~82 A). The ESC is a Castle Creation ICE 80HV and the batteries are Rhino 4900's lightened by removing the shrink wrapping and cutting the wires short.

Edit: so far i have 3 solutions for the weight problem:
1. remove the spinner - easy fix, but spoils the lines of the plane;
2. build a lighter cowl - the one in the pictures is one of the first attempts, i can probably save at least 20g building a new one;
3. buy HV servos and remove the regulator (saves 38 g but it's quite expensive).


fuselage..........................1039
cowl...............................125
canopy.............................117
rudder..............................70
gear+screws........................144
wheels+axles........................50
taiwheel assy.......................20
left wing..........................327
right wing.........................325
left stab...........................96
right stab..........................96
wing+stab tubes.....................80
motor..............................690
ESC.................................98
10s battery pack..................1200
receiver............................25
rx battery..........................55
spinner.............................45
propeller...........................70
rudder servo+carbon horn+screws.....70
elevator servos (2)+screws..........60
aileron servos (2)+screws..........120
control rods........................22
regulator...........................38
servo leads.........................60
wing adjusters+screws...............21



total.............................5063
Attached Thumbnails Click image for larger version

Name:	Xv63777.jpg
Views:	107
Size:	249.5 KB
ID:	1501884   Click image for larger version

Name:	Yt60525.jpg
Views:	88
Size:	232.5 KB
ID:	1501885   Click image for larger version

Name:	Di10964.jpg
Views:	93
Size:	227.5 KB
ID:	1501886