ORIGINAL: microsprint9
Just an update, plane does fly, and missleman it didn't break on the first, second, third or fourth flight but just so you know i safety wired the engine to the landing gear so if it did break off it would not come at me. There is a hole in the walbro carb that i need to fix as it keeps deadsticking on me two minutes in.
I'm actually glad i used this 32oz engine, as a guy on RC Groups has had to add about 10oz of weight to the nose of his explorer running a .46 in order to get the CG balanced, but i will stress using an engine like this is not for a beginner.
//snip//
Well, Sir, and et.al. that are so confident, IMO, Missileman and opjose gave you fair warning. Hopefully you will be right and I would bet that these two concerned gentlemen wish you the same.
I have seen gas-burner firewalls leave the nose of models supposedly designed for the engine size. Although I did not see this incident, I was on the field at the time. XXX had flown this .60-.90 model --an ARF -- a around 10+/- flights over a couple days, with a G-38 up front. [:-] I suspect that the weight, torque, and vibration were all working together. This time he fired it up and before he was out of the way, that engine wanted to fly and was not gonna' wait for no darn airplane. It did grab on to a thumb and 2 fingers to take along for the ride. This particular RCer was a tad overly confident in his ways however I don't see him much anymore.
In the past few years, I have had a couple minor incidents which never happened for the 50 years prior. I am getting much more focused on safety than before. I do build with some overkill. [X(]
Here is an example: You can see that there are two heavy Alum. strips protuding behind the cowl. They are continuos around the firewall and this is only a G-26. The fuse. frame there is 1/8 ply with significant structure behind the ply. I don't think this one will jump from the firewall.
Best of luck to you, but remember that X John Smith had 40 years at sea with never an accident the night he sailed as Captain of the Titanic. Shot happens, no matter how experienced one might be.