Please suggest me an electric frame that can fly for around 20 mins

Hi all,
After i lost my blade 450 3d heli, i need to build another one and need suggestion to select an electric frame that can fly for approx 20 mins.

My Blade 450 3D could fly for 15 mins with a fpv setup and 4000mAh 3S battery.But i want newer and even more efficient frame for my next build .So looking for suggestions.Thanks.

Hi, It all depends on you budget and the size. These models are quite ligh and you can get the 20 minute flight easily

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Thanks Loren.Will check it out.

I just bought used Raptor 50 titan SE with electric conversion.One local guy was selling it at good price.It feels quite big compared to blade 450.Its fitted with all futaba servos and futaba GY611 gyro.Going to install arducopter on it soon.