Heliman450
Well-Known Member
Hi Steve,
Good to hear from you again. I had a strong feeling you'd get back on this one. I fully understand that one can't run the gears together with unmatched parts. The descriptions on the site aren't clear enough to see exactly what's compatible with what. It's really only a matter of buying a selection and trying it out as you seem to have already done or picked up on somewhere.
Where did you find out if not by trial and error?
My Excel sheet allows for the details to be tested before committing to a purchase. Of course, one needs to study closely for details like bearing sizes, shaft sizes etc. that would nail the obvious. It just takes time to check through the drive trains to spot the obvious if it's there. I'm staying with standard for now and two sets are due on Thursday so that I'll have a spare set for use as comparison or replacement if/when I strip the next ones
Your head speed calculator has been very useful. I checked out my 550 but don't think it's possible to achieve the specified low rpm on the head whilst maintaining a reasonable tail rotor speed. It comes quite close (1935/4385 with 50% throttle) so my plan is to run through the Spirit Pro settings before doing a test on that one. Now that the Supra X connectors are fitted, it's been screaming out for a trip to the field. I'm aiming to take both helis there soon after the bad weather forecasted for the next few days passes.
Any tips you can give on the 550 gear options will be much appreciated.
Cheers!
Good to hear from you again. I had a strong feeling you'd get back on this one. I fully understand that one can't run the gears together with unmatched parts. The descriptions on the site aren't clear enough to see exactly what's compatible with what. It's really only a matter of buying a selection and trying it out as you seem to have already done or picked up on somewhere.
Where did you find out if not by trial and error?
My Excel sheet allows for the details to be tested before committing to a purchase. Of course, one needs to study closely for details like bearing sizes, shaft sizes etc. that would nail the obvious. It just takes time to check through the drive trains to spot the obvious if it's there. I'm staying with standard for now and two sets are due on Thursday so that I'll have a spare set for use as comparison or replacement if/when I strip the next ones
Your head speed calculator has been very useful. I checked out my 550 but don't think it's possible to achieve the specified low rpm on the head whilst maintaining a reasonable tail rotor speed. It comes quite close (1935/4385 with 50% throttle) so my plan is to run through the Spirit Pro settings before doing a test on that one. Now that the Supra X connectors are fitted, it's been screaming out for a trip to the field. I'm aiming to take both helis there soon after the bad weather forecasted for the next few days passes.
Any tips you can give on the 550 gear options will be much appreciated.
Cheers!
I've only stripped the front transfer gears (my term as it sounds the best to me) the rear is still fine but I'll take note if I'm unfortunate enough to mess that one up, too. The 550 is already running 95mm tail rotor blades and I have a set of both as spares right now.
