Another way in the Cessna's - is to simply not pay attention to airspeed .
Bad joke --
On models - specifically :well designed, properly balanced - decent wing loading -etc.,
spin entry can be a problem .
The really good ones have exceptionally wide , stable speed envelopes and can be easily put into a "sink" rather than a spin .
Tho the model is stalled - it simply settles smoothly with application of a little more power.
So --- spin entry, may require you to setup a "break" , by holding a even , level approach with the nose elevated, power on a setting which delivers high angle of attack but no altitude changes.
Then - when positioned, reduce power and add more elevator and rudder .
The proper combo --will setup a combination of the nose and a wing dropping as the model yaws.
At this point -- feed in ailerons as needed to provide the type of spin desired.
Watch and learn .
The model can be controlled to deliver a rather flat spin - slower rotation --or a more nose down spin -- faster rotation.
both will be acceptable as tru spins by the judges - (in contests).
The recovery from the steeper faster spin -will be quicker than the slower flatter spin.
In most cases - simply "letting go " will make a nice recovery.
BUT-- not always.
The "why" in this has to do with the way the model is spinning .
a flatter spin has the model at a lower airspeed --but at higher rotating energy setup.
Here is where the old "ice skater" parallel takes place .
The skater pulls his arms in and the rotation speeds up - OR- extends his arms and the rotation slows.
In this case the arms ain't the wings - rather, the arms are the nose and the tail.
In order to get back to normal or forward controlled flight (the model is still under control in the spin, just not in forward controlled flight)--the energy has to be greater in "nose first" direction--than in the "nose chasing the tail " energy setup.
If you don't believe this --try it .
Recovery on some designs from the flatter spin may simply be impossible --but for an aerobat -with large controls - lots of throws and huge power on tap - there is a combo which will work - just experiment till you find the one which looks good to you.
In a worst case scenario--- here is what can happen----
let's take the case of a guy who builds a scale early model Ercoupe --
he also keeps the power available " scale" ,that is , marginal.
Now , he dives and climbs over and over -trying to find a combo which makes this "spinproff " model, spin.
Finally he whips it up and holds full aileron/rudder and Up and "presto" -we get a nice spin.
Next problem --
Spin exit .
The model is in a rotation but control authority is not good-to put it mildly --coupled rudder /aileron
power simply increases the spin.
what's next?
(tune in tomorrow for the article on rebuilding Ercoupes.)