Thx for your answers and yea i know its not suppose to be fast be mine is very slow and the engine generates a lot of <span style="font-size: small; "><span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; white-space: nowrap; ">resonance in the wings and its seems to be from the engine not getting high</span></span><font color="#222222" face="arial, sans-serif" size="2"><span style="white-space: nowrap;">enough rpm so will a smaller pitch do the trick.</span></font><h3 class="r" style="font-size: medium; font-weight: normal; padding: 0px; margin: 0px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: rgb(34, 34, 34); font-family: arial, sans-serif; "></h3>