street machine

[shergar]

hi guys
i have what i believe to be a balsa craft street machine , hoping to get her flying this summer , just need to know where the c of g is and what to set the control throws at , thinking of slotting something like a os la 40 in would that be ok in this model.

many thanks wayne


018
by shergar3,
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[Richard]

Its about the front of the canopy... 1/3 chord rule of thumb.

[shergar]

cheers Richard

sorry I'm fairly new to aero modelling and you have completely lost me with the 1/3 chord rule of thumb is that to set the control throws.

still flying a trainer at the moment but have a travel air which I have just finished as a follow on from the trainer but still hope to fly this model this year .

what is the street machine like to fly I know it's going to be a bit more lively and a lot faster than my trainer but should I expect any nasty surprises .

many thanks Wayne

[YOUNG GUN]

Looking at it - its going to be a fair bit faster than a trainer...

Its also got full length ailerons - so I would go gentle with the throw rates else its gonna snap roll so quick you wont know whats going on.

It will be more "Pin-point" than a trainer... in the sense, where you direct it, it will stay (ish) until you adjust its course....it wont have any self-leveling like a trainer does - it will be the opposite and less stable.

It might be easier to stall than the trainer too - but it might have a better power to weight ratio to pull you out of a stall..

It will be more sensitive with the tail controls too - just a bit more "snappy" so again - set low throw rates to help ease you in.

[Richard]

Theres loads of calculators on the net that will help you work it out, a search on google found this one: http://www.scaleaero.com/CG_Calculator.htm

The rule of thumb for straight wings (like your model) as a starting point is 1/3 back from the leading edge.

[shergar]

thanks for the advice guys
going to set the throws at 10mm for ailerons and elevator because there the same as the travel air I have, and as much as I can get with the rudder, I have a OS 48 four stroke which I was going to put in a flair piper cub (but that project is far from being finished) hope that motor has enough poke ? once I get her finished I'll let you guys know how I get on.

thanks again Wayne