I'm sure it will haul the mail....its a 60 sized engine and the model balanced perfectly with the servos in the rear as shown. No Lead.

I used Jett's radial 3 bolt mount. I cut a piece of black Delrin and matched the original holes in the firewall so it kinda just plugs in.

One of the real nice things about the 90L Jett engine is you can purchase the longer muffler and run larger propellers. Two engines in one.....

Normally this engine runs a 12x6 at around 14,300 rpm.

bob27 says I should get around 11,500 - 12,500 rpm with a 14x6 or 13x6 and the long 120 size muffler.

I'll try it out this weekend if the weather is nice.

If you've never owned a Jett you should consider one. They're more money but the quality and customer service is awesome. AAC construction, 26oz. with muffler and prop nut.