maybe a silly question

[willatodd]

ive seen some talk on here about pre rotators and pre rotating forward and back stick i was wondering what the difference was the bird i fly has to have the stick forward to spin up wondering pros and cons????
thanks.
Willatodd
your friendly publican

[russ]

bet you is flyin one of them european machines...........

Best system is ability to pre spin flat disc, then full back still engaged, then start rollin while still engaged, then spinner off, gets you airborne much betterer.......:D..........just my view

MT03's etc..........factory specs say .......no servicable prespinner....machine is grounded untill fixed...............go ponder that.

[willatodd]

your right on the type i am flying an mto sport, so is the spin with back stick to stop rotor rpm drop in transition from forward to back stick or is there more to it?? and i dont think id like to fly a plane without a prespinner dunno why but my belief is it takes a while to get rpm up without one and i aint got that much room to run off from. not being smart just getting all the facts i would however like to fly a rosco type machine in the future to see the difference i have heard they handle alot differently mind you i am only at 19hrs total time so a while off yet id think!!

[russ]

Mate.........pre spinners do make life easier........but you must get the hang of hand cranking them up, then ground roll etc etc, gettin them up to fly speed.

So what if the strip is a tad short......run up and down it a couple of times gettin those blades really honking.
Practice on a good long strip, but place a marker about 400m down the strip, imagine that marker as the end of your strip, and wind up your blades within that length............experiment.
Begin into wind, but returning down wind ground speed must be quicker, on this downwind leg, get your gyro up onto it's mains, hold it up right to the point of last turn around.......be agressive. Drop it onto all 3 wheels, turn it around quick...............now get real agressive, get them blades honking......firewall it, nose a tad high.........remember...air speed is good, so be prepared to lower nose straight after lift off to get airspeed up, you may just be a metre off the ground..........but that buildup of airspeed is critical.

After you get that all nailed...........shorten those markers to 300m, or less, then do as above. You'll be glad one day that you know how to get off in a short strip.

Remember.................airspeed is good. ( those mt03's....55 plus )

just my view.........

[willatodd]

funny topic went for a fly today 20th hour and they have resealed about 300 metres of runway guess what that was all i was allowed to use and less and less got to the point with keeping nose low till 55 then keeping it at 55 while firewalled i was at 200 ft before the end of the 400 mtr strip. and climbing its head off and then spin rotors up to 100rpm then slowly build up rpm was another lesson a few weeks back so seems like hes on the money. but still wondering why so important to be able to spin up back stick?????

[russ]

Who said you must wind up blades at full back stick ???

You wana set the stick full forward.........go 4 it..........experiment both ways, then report back which was the better over the same runway distances.

You begin initially with a flat disc, then ease the stick back as you get em honking.

Remember, at full back, you have wind helping you, you have prop wash helping, frees up your hand to pick your nose, removes that delay period from full forward to full back with resulting rpm loss.......

[willatodd]

ahha i had read other posts wrong the mto sport cant ingage pre spinner unless forward stick wont allow we always spin up with flat disk as soon as 200 full power full backstick gone to the skies id read about pre rotators and someone once said engageable at full back stick the only way it should be i thought they start wind up back stick and couldnt work out benifits either way as i am yet to see any real rotor rpm loss between pre spin forward stick and transition to back stick. so it is more personal preference, we have a cut off switch to stop engagement of pre spinner at back stick. but now i think i understand what others were saying thanks. so you recon the single seat mustering models are alot different to the mto sport as in performance and the way to fly them or not to far apart? i am extremely happy with the mot sport but always curious...

[Birdy2]

so it is more personal preference
Todd,
Im not sure if its me your refern to bout the ability to prespin at full back stick, but i do ask, wenever sumone says theyv got a new wizbang prespinner, if it can be engauged at full back stick.

And no, its not personal preferance, its nessesity.
If you can hold the spinner engauged wen on the backstop, and hold it on till AFTER you break ground, it means you can get off very much shorter and steeper, and get over the 'hump' earlier.
The ones i use can prespin the 28' blades to 200+ and 26' blades to 280+.
But, the engine rpm is high once you get past 150 odd rrpm, and the machine is getn lite on the ground at 200 odd, so ground/wheel breaks are not do'n much.
If the stick is full back, even in nill wind, it acts like an airbreak, given you a little more holdn power before you blast off.
Also, haven the disc on the backstop, the prespinner still applyn torque and the horses given their heads, means youll get off proper short.

Haven said all that, i still like to slap um up by hand occasionaly, if iv got the room.

[willatodd]

thanks birdy n russ makes alot more sense now makes me wonder why the mt gotta be full stick forward now thou maybee a question for me instructor

[bones]

I could tell you but it is best to ask your instructor.
Just be ready for a real good reason :chuckel:

[willatodd]

bones dont get me wrong i will certainly be asking my instructor but i also wanted to hear what ppl here had to say you can never have too much knowledge and it all helps your opinion would be appreciated!

[Birdy2]

The only reason you couldnt hold the stick on the back stop with the prespinner on would be, a desigen fault.
Either the blades can contact the tail with insuficiant rrpm, or the uni joint on the drive shaft isnt capable of driven at that angle, or both.
Either way, its a desigen fault.