RE: Spool times....
 

OK OK, MAYBE I added a little color to make it interesting....

Here are the facts, the engine is slow to spool. I have timed it several times while observing the RPM's on the monitoring unit and on average it is about 8 seconds to reach max RPM from idle. This has been done on hot days as well as cold....

I have attempted to adjust the ramp times and every time I move away from the stock setting, no matter how small the movement is, the engine over temps on spool or flames out completely. I have no doubt that it most likely needs service to some degree based on the number of hours I have on it but honestly it has Always been slow to spool.

Now, with that being said, this engine is totally reliable. It starts every time with so much ease that it is mindless. I makes excellent power and never gives me one bit of trouble. The only thing I have to deal with is making sure I make any decision that requires power early and execute that decision with a cushion of time to spare.

Please don't take this as me bashing the J66, just the oposite...but spool times are what they are....I look forward to getting them improved.

Peter, I will get it up to you at some point for inspection, I just have to make the time and effort to get it done.

RE: Spool times....
 

i can only speak of my personal experience with my P-70s.......when bought new it had an early V5 ECU and spool time of 6.5 seconds, at around 4 hours run time the NGV started dragging on cool down so i sent it in and had it opened up a little and the ECU was updated to an early V6. when i got it back the spool time was drastically improved to just under 4 seconds, could of been the shaving of the NGV or the ECU no way to know for sure what made the change.........around 19hrs it was involved in a crash and the clamp dented the outer case so i sent it in to have that replaced.......got it back with a later V6 ECU and the spool time is upward of 7 seconds again. with that ECU version the RS232 wouldn't work with it so rather then reinstalling it i let it sit in the box for about a year before putting in in a boomer to give some people at the club some stick time on, it started flaming out and it's sitting at JetCat USA right now to have the CC tuned, Bob said he had an update to the ECU that would fix the RS232 incompatibility and when i get it back we'll see about the spool time.

RE: Spool times....
 

got the above mentioned P-70 back today, it now has an updated ECU (both hardware and software) to 6.0q. the spool time is still just a tad over 7 seconds from idle to 123K.

RE: Spool times....
 

Why would a newly updated ECU reduce the acceleration time?

Pete

RE: Spool times....
 

i have no idea, both accelerations are set to FAST in the menu.

RE: Spool times....
 

Does anyone know of a definitive list of spool times, is it featured in the comparison table at the back or RCJI mag?
I would happily substitute thrust for a better spool time, the joys of small field flying!

RE: Spool times....
 

I would love to see that!

Pete

RE: Spool times....
 

if you'll get a 120 SE, 120 SX, Titan SE or a 160 SX you can have both thrust and a quick spool time.

RE: Spool times....
 

no problem

change the pump to a Hausl 30020SP
change the battery to a lipo 2s1p 7,4
set acc to 008 deac to 005

and done!

RE: Spool times....
 

I assume its a bit like chipping your turbo car, the tweak to the software/hardware just improves the reaction time, its also a bit like the 0 - 60 time on your car all a bit pointless except for bar talk, its the mid range acceleration that counts, i.e. don't close the throttle all the way, only close it too one third throttle whilst flying around, this was recommeded to me from Ali, and I think he knows what he is talking about.

Mike

RE: Spool times....
 

Far it bit for me to argue with what Ali might have said, but 2 secs at 30mph is a big difference when making a decision on a go around or not for short field flying.
If i know that i can punch from idle on late approach to full power in 2.5secs rather than 6 secs because of the turbine i bought, that makes life much easier for landing.

Plus, with more choice and fewer differences between manufacturers now, it might be the next consumer benefit, I would substitute kero start for faster spool times, and look at the effort that has taken for some companies to get right..