copperclad
Elite Veteran
Location: ..
| hi Peter
i was happy to answer quickly , i said " i don't know "  , ( Samuel Clemens )
i am just taking some info i recieved and hoping it is correct , i feel the source was very good though  , i know the engine is balanced for a certain speed and i am probably over it at this point , and you get into the problem , whether you are overspinning the engine or not , a big part of my reasoning ( and i could be wrong ) is that the G-20 has the same piston as the G-231 , but the G-20 has a shorter stroke , so i am thinking that since a 231 is alright to 12,500 RPM , that the 20 with it's shorter stroke should be OK to this speed in a heli application also , and that running the engine up in it's power band is less strain than loading it in the lower section of its band , again i am guessing and crossing my fingers , so although it may be a fools parade , it is a starting point , over working the engine , by either lugging it or overspeeding it , i believe will overheat it , and this is what to keep an eye on , we had temps of about 40 degrees here today
my whole setup to find a starting point for the throttle curve , back before i left on vacation , was to peg an aero tach in the ground pointing straight up , and set the pitch curve to 3 degrees of pitch straight across , and with the TX in the throttle screen , i ran the machine up while watching the readout on the tach , i was not sure the engine and stock gearing would allow me to reach 1500 headspeed , but it was no problem and once there i noted the throttle input percentage so i could use it as a starting point for a throttle curve , then for hover it was just a matter of programming the pitch curve so it would give about 5 or 6 degrees of pitch at that point ,
i am not saying this is the way to do any of this , i am just saying this is what i did , to get a handle on what was going on with the machine
anyway this let me hover about a meter off the ground in my backyard for a few minutes , and at that point it was land while you are still ahead and take it inside for a carefull post flight
after that , while i was waiting for weather here in Rochester , i took the time and my pitch gauge and spent some time setting up a normal and idle up 1 and 2 , using the throttle input i knew gave me 1500 headspeed and bumping the throttle curves up a bit and the pitch curves down a bit from what i had used to hover the first day
today was the first time i got to fly these curves and they are closer but i still want to work on them , like i posted above a cooler head would have been taching and temping , but i was overtaken , by the drive to just get it in the air
my thinking was it flew for a few minutes in the backyard and nothing came loose that was supose to be tight , and nothing got tight that was supose to be loose , the gears looked new and the muffler was still tight , so today i wanted to put the tank of fuel through it to see that this would all stay true , and i am seeing that it is shaking down fine , hopefully i will get a chance again tomorrow , and i will have my tach and temp sensor handy , thanks again , dana  |
, i would love to know what horse power they are getting at those speeds , thanks again , dana 
) LOL , so last night i sat down with the pitch guage and the notes i made at the field , and in going over the pitch curves i saw , that they were somewhat skewed from how i remember setting them , i remember setting it up -13 ~ +13 , but when i went over them last night they were -16 ~ +10 , and i could see it was from setting or resetting the subtrims to level the swash a few weeks ago 
, so long story short , it turns out i was hovering at about +8 degrees pitch 
, dana 
