To the flying ghost thats your user name translated.thanks for replying were pretty sure that its not going to crash because were going to be flying it in tall grass I think that the grass is taller than me so that should stop us from crashing it but my biggest concern is that the grass will get tangled in the propller or hit this one pile of rocks but we have an extra propller and like we said were building it extra stong so thanks for that advice Uncle Dave is building it as light as he can and its really not that heavy.Hes making the wing struts.Thanks again for replying and the advice.