As most of you know, I have the opportunity to fly with many fellow jet pilots. Skill levels range from complete jet novice to seasoned jet pro. Lately, I have seen both types of pilots having issues while flying. The common problem is not using the trims on the transmitter. Guys are flying untrimmed aircraft and struggling.

My advise is to always take a moment and verify the plane is flying correctly. Setup a straight line and take your hands off the sticks; what does the plane do? Does it climb, dive, roll? If so, FIX IT! This can take a matter of seconds, but can make the entire flight more enjoyable.

Another trick I use is a little more complex, but greatly reduces the pilots workload. Setup Flight Mode Trims assigned to the "flap switch"; 3 modes, Cruise, Takeoff, and landing. This allows the pilot to trim the aircraft for each "Flap Condition". I enable this on the ailerons and elevator on my DX18. The great part of this feature is that my aircraft is always in trim when I change speeds; takeoff, cruise, and landing.

Another note, I trim my aircraft (elevator) with the flaps down such that the aircraft will maintain altitude in the landing pattern, when the correct throttle position is set. If I increase the throttle the plane will speed up and climb, and slow down and descend when power is reduced. Remember that elevator controls airspeed and power controls rate of descent/ascent. 

Make sense? Comment below if you have any questions.

Dustin

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Dustin,

The only problem that I see with flight mode trims on the DX18 is the issue of the throttle trim changing with the flight mode, possibly causing the turbine to shut down at the wrong time.

Mike Danchak

Do you have the qq? Are you using the 3-pos trim? That issue is fixed.

Otherwise leave the throttle trim set to common.

Dustin,

This is a great topic to discuss.  Trimming takes a lot of work, usually several flights.  But the end result is totally worth it.  Here are my tips

After the initial trimming is done (flying straight in all 3 flap configurations), there are 2 more things I like to do

1) fly straight, pull up and see if the plane climbs straight.  If it doesn't, it can be 1 of 2 reasons (other than piloting of course):  Laterally unbalanced or rudder trimming.  I play with both until my plane climbs perfectly straight from a level flight.  You have no idea how much simpler your life becomes if you don't need to fight this

2) Couplings:  do knife edges to both directions.  You don't want your jet to go come closer to you or go away from you (towards the canopy or the bottom).  Also, you don't want it to roll when you apply rudder.  You achieve this with the rudder to ail/elev mixes and also by having a correct CG.  This one is tricky, takes a lot of flights and it really helps to have a spotter with you taking notes, because by the time you land, you will forget which way it was you wanted to trim

Those are my 2 tips... anyone else?

Very good points Jack, thank you.

New to jet,but I have flown quite a bit of IMAC, with my iMac planes I Trim and adjust my planes according to the Peter Goldsmith Chart that he published a while back and was wondering if these same concepts apply to jets? Or does Mr goldsmith have a chart more tailored to jets?

And a big thanks to Peter Goldsmith for the trim chart, made a big difference for me.

,

J.C.

You advanced guys are missing the initial point. So many Jet guys are completely forgetting the basics, they are not performing Knife-to Knife and losing 10 ft during the maneuver; they are fighting the plane like its a 20lb bass the entire flight.

Maybe we can get Mr. Goldsmith to share some notes!

Here is a copy of the Article and the chart, if you read the article the chart really makes sense .

Attachments:

Thanks for sharing! 

So happy I don't fly prop planes!!! LOL

Ali has also done a couple informative DVD's available via Traplet that are pretty good. Not only for setup and trimming, but also goes into the mental prep of flying jets and planning ahead for contingencies, etc.

I agree with Dustin, a lot of people fight to keep the plane in the air rather than flying it. I flew pattern late 80's / early 90's (ouch!!) and quickly learned that I had advantage over half of competitors just by flying a straight and trimmed plane.  

Mike,

You can assign each trim to be active or inactive in the flight mode. I leave the throttle trim alone and set the three flight control trims as active.

 

John
 
R. Michael Danchak said:

Dustin,

The only problem that I see with flight mode trims on the DX18 is the issue of the throttle trim changing with the flight mode, possibly causing the turbine to shut down at the wrong time.

Mike Danchak

Really???? Jet pilots not triming their airplanes? basics, basics, basics....

Can i know why?

Since my start in the hobby, 20 years ago, i was told the first two basic things.....

altitude and speed are your best friends

and...

take off and start trimming your airplane.....

Even when i sarted flying my jet, a friend, Leopoldo Lenzi, told me. step by step what to do, we fly Futaba, so Flight conditions when using flaps was part of the rules........ separate trim conditions on every switch position is a must, and the result is awesome....

Coupling the rudder is a third step, taking the jet to the best level needs lots of testing, but for starters, there are 3 basic steps..... flight trimming..... as we do with each airplane, try to relax and enjoy your model, make it fly straight, second, use flight conditions, i name them. NORMAL, FLAP 1, and FLAP 2, each of them manages to trim the elevator individually, i take off in FLAP 1, make my flight in NORMAL mode and landing is done in FLAP 2......... makes things easier... Third thing i do is rudder coupling.... a little mix between rudd and aile-elev to make things smotther then in knife edge, point rolls etc...

Peter goldsmith trimming chart is a guide that makes better pilots and better airplanes..... even trainers, so it has been like a treasure for me...... i suggest, study and fly it.....

see ya mates!!!!!!

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