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Author Topic: Flight Trimming Stuff  (Read 1121 times)
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crashcaley
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« on: September 06, 2009, 08:23:37 PM »

Hi Everyone, The pest here again to ask a lot of the experts, so that the information is here for those like myself who are either newbies to our hobby, or for people like myself who always seem to struggle to remember things.
 My idea is to put a list of the various basic things you can do to trim out a model, to solve problems encountered. I've made up a list of all that I can think of, but dare not put down what the adjustment will do, as I always seem to do things backwards. Grin So here's a list. If you could match the effect on the model, I would appreciate it, if it is possible to do so without confusing the whole thing.

I will make an assumption that we are going to use a length of wood to glue into a position to make these adjustments to:
Fin - left side and right side
Stab - top left and right sides, and bottom left and right sides
Stab Tilt - under left or right sides
Stab Incidence
Wing - top right and left, and bottom right and left
Wing Tilt - under right and left sides
Wing Incidence
Wing Wash out and Wash in
Motor Incidence (thrust line) Left and right, and up and down
CG (Center of Gravity)

I'm not sure I touched everything, but I think this is a good basic start. Of course, there are probably books out there that can answer this, but not everyone owns a copy of the book(s).

Caley
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What's stall speed?  Undecided
gossie
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« Reply #1 on: September 06, 2009, 11:34:47 PM »

Strip of wood on left of fin will make a left turn. Right side right turn.
Strip on top of stab. will hold stab down and nose up. On the the lower side, stab. up nose down.
Stab. tilted high on the right will promote right turn. Left high = left turn.
Stab. incidence means it to be either less or more of an angle to the wing.
Next question?HuhHuhHuh?? Don't understand it, but I'm down here upside down. LOL.
Wing tilt. Right wing high = right turn.  Left wing high = left turn.
Wing incidence is the angle of attack of the wing. Usually more angle than the stab.
Wash out is the tip or tips of the wings angled or 'twisted' slightly down as compared to the center section of the wing airfoil. i.e. less incidence.
Wash in is when the tip ribs have more incidence than the center section. Opposite of above.
Thrust line is where the driving force points to. i.e. Angle a propeller to the left will promote a left turn under power.......etc. etc. etc. as with the other angles.
C of G.  The static balance point of a model or full size aircraft.....or anything else for that matter.  i.e. 4WDs have a high C of G and is the reason they tend to tip over or roll more often than a regular automobile. People with big feet would have a lower C of G.

That's it........enough from me.
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Duco Guru
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« Reply #2 on: September 07, 2009, 12:02:22 AM »

This Chart May Help..
SymptomPossible CauseFixes
Model Dives, StraightawayNose HeavyRemove Nose Weight, Add Tail Weight
Down ElevatorAdd Up Elevator
Model Dives in Spiraling LeftToo Much Left RudderBend Rudder Slightly Right
Torque ReactionReduce Power, Use Smaller Prop, Add Right Thrust,
Add Washout To Right Wing, Up Elevator
Warped SurfacesCheck Model For Warps, Fix With Steam/Heat,
Fix At Field With Masking Tape Tabs
Model Dives In Spiraling Right   Same As Left Except For Torque   Left Rudder, Washout Left Wing,
Reduce Right Thrust, Larger Prop
Stall (Roller Coaster)Tail HeavyAdd Nose Weight
No Turn Under PowerAdd Turn With Thrust Adjustment (Right or Left)
Too Much UpthrustAdd Downthrust
Too Much Up ElevatorBend Elevator Down
Too WindyWait For Calmer Conditions
Model Flies Too FastMotor Too StrongReduce Rubber Cross-Section
Motor Too ShortUse Longer Loop/Loops
Prop Too SmallUse Larger Prop
Model Lacks Power to ClimbMotor Too WeakUse Larger Motor/Loops
Lands With Turns LeftMotor Too LongShorten Motor/Loops
Prop Too LargeUse Smaller Prop
Model Refuses To Fly
In Selected Direction
Design Quirk??Try Flying In Other Direction,
Add Wingtip Weight In Selected Direction
Model Refuses To FlyGuillowsWall Hanger, Hat Dance Hat, Skeet Target

Guru
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crashcaley
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« Reply #3 on: September 07, 2009, 12:44:26 AM »

Wow! Bob and Gossie. Thank you so much for taking the time to provide this data. It definitely will help the trimming challenged, like myself, and the newbies to our hobby. I keep wracking my pea brain for subjects that will help others in our hobby. Thanks again for your help.

Caley

PS Bob, you're toooo much.  Grin
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What's stall speed?  Undecided
applehoney
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« Reply #4 on: September 07, 2009, 01:00:17 AM »

Wing tilt. Right wing high = right turn. Left wing high = left turn.

Gossie,
right wing high is effectively same as left stab tilt... left glide turn

left wing high..................................................... right glide turn
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gossie
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« Reply #5 on: September 07, 2009, 01:27:18 AM »

YES YES YES Jim and Caley. A seniors moment for sure. Sorry guys.

I shall repeat answer to question #6. As Jim says RIGHT WING HIGH = LEFT TURN.
LEFT WING HIGH = RIGHT TURN.

So how can I delete/edit that.  Or Sundance do it for me please.
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