The build went well but I only flew it foe 3-4 Secs due to trying to climb to fast and stalling it Here is a link to some pics of my build and crash. And then Sorry in advance but the pics are in the wrong order from crash-out of box So I would start at page three and then two then one http://s1204.photobucket.com/albums/bb419/388thAlpha/
Wow, that's a lot of damage! I can't remember, is the 168 foam or fiberglass? Interesting you went with a four-bladed prop, they are much less efficient compared to the standard two-blade. I hope you're planning a rebuild??? Its a great platform for FPV and the ones I've seen are excellent flyers.
Its fiberglass and I picked a four-bladed prop to try to get more thrust. Also I was limited to only a 9" prop so there for couldnt really get a big enough prop on there or the correct pitch. Im thinking it was all right but needed to use a 40C-60C output on the battery instead of what I was using which was a 20C so that didnt help. I would like to rebuild it but not to sure how to get the wings back into one piece. But the rest of it Im thinking I should be able to fix it. I was also thinking about maybe going to a smaller plane that was made out of foam. Maybe even a Sail plane. How to remember this 168 was 9 LBS seems like was the final weight.
The "rule of thumb" is to use the fewest blades w/ the largest diameter However Horse Power, Ground Clearance and Tip speed should be the deciding factors. The more Horse Power teh larger diameter propeller is needed to absorb it. Tip speed could also limit the blade choice. If the Tip Speed nears MACH_I then a blade will loose efficiency! If the ground clearance or tip speed limit the diameter needed then we add more blades. With our helicopters especially w/ scale builds "wing loading" is a big factor which also needs to be considered. Yes two blades are generally the "best" BUT sometimes "best" needs to be defined before we choose .............. AND sometimes, just sometimes THREE blades just LOOK the best, hehe FYI: Gave myself a headache reading up on this one {LMAO} anyone GOT an aspirin !?! Propeller Performance Factors Sorry didn't mean to sound gruff, just tried to keep it short as it's a BIG subject [shadow=Orange,left]w00d[/shadow]
So for this plane its 8 lbs if I remember right and then I can only use a 10" prop as the biggest size other wise it would cut into the fuselage. Did see a 2x10x7.5 prop, 3x10x7, and then what i have now a 4x10x6 so not really sure what would be better. Its a Pusher plane as well. I was using a Hacker A40-10S V2 14 pole. The Battery's were 6S 4400 20C And to correct my posts above it was a 10" prop on it not 9"
Here are a couple of links to make things easier for you. http://brantuas.com/ezcalc/dma1.asp http://www.adamone.rchomepage.com/calc_motor.htm I think you will find that you'll get more bang for your buck with the two bladed prop as the others have said. Just add your motor, ESC, and battery info into the calculators and you can soon see what prop will work best for what you want to do. I did not see your motor in either of the calculators but you can also enter the motor specs and get the same results.
{LMAO} I'm guessing Bill's links are the "aspirin" well virtual aspirin I was looking for! There sure was allot of MATH involved, I almost got out my calculator (hand held) for these lessons. I have to confess I did learn something, choosing the correct propeller was NEW for me ... EDIT: I remembered Castle Creations (NEU Motors) did some Flight Calculators For Planes ---> eCalc: PropCalc ---> for Helicopters ---> eCalc: HeliCalc ---> and for Ducked Fans (EDF) ---> eCalc: FanCalc [shadow=Orange,left]w00d[/shadow]
