Trex heli size comparison

Hello again,
Since there are more standard sizes out there, I will point out the most common size format for the Rc Helicopters, which is used by Align. According to their size chart you can have the following heli classes:

• 100 size class - usually rotor diameter is 192mm
• 250 size class - usually rotor diameter is 460mm
• 450 size class - usually rotor diameter is 710mm
• 500 size class - usually rotor diameter is 970mm
• 550 size class - usually rotor diameter is 1188mm
• 600 size class - usually rotor diameter is 1347mm
• 700 size class - usually rotor diameter is 1562mm
• 800 size class - usually rotor diameter is 1780mm

Align T-rex size chart for Rc helicopters

Of course there are some intermediate size heli's against the Align Trex chart, like for example the 125 size micro helicopters, like the Walkera Dragonfly, then the Walkera Master Cp which is more of a 200 class heli, and there are also the E-flite Blade 300 and 400 sizes hel's but let's just say these are some exceptions :)
Personally I have 100 size, my Genius CP V2, reviewed here which I find very good for indoor practicing in my living room, but also outside; then my Walkera Master CP which is more of a 200/250 size heli, also stable and good learning tool, since it is built to handle crashes-definitely not a living room flier, and lastly, for now, my RCX450 CF similar to the Storm heli, which I converted from flybar to flybarless.
According to each one's budget you can get the heli you want, of course the bigger the class, the better in terms of stability, but more expensive would be the "maintenance fee"  for it.

Another more "general" classification is made based on the weight and rotor diameter of the heli, as follows:

• Sub-micro (under 100g,  less than 200mm rotor diameter);

• Micro (under 500g, less than 500mm rotor diameter) - a 250 size heli is in this category;

• Miniature (under 1kg, less than 800mm rotor diameter)-usually the 450 class is here;

• Small (under 2kg, less than 1000mm rotor diameter)-the 500 size heli is in this category;

• Normal (under 4kg, less than1500mm rotor diameter)-the 600 size heli is in this category;

• Large (under 6kg, less than 2000mm rotor diameter)-both 700 and 800 size helis belong to this category.

Hope this info is helpful, since when I started this hobby the sizes was a very confusing topic to me...
Thanks and happy flying to all,