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Prop rotation

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Tim Ballinger22/01/2019 11:11:04
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778 forum posts
283 photos

Thought i would make use of some reasonable weather yesterday and take my twin for an outing.

All preflight complete I opened up the throttle(s) and it did not move. The grass was deep , a bit damp and the ground soft so perhaps the wheels were just too small. RPM reading was normal so nothing else left it must be bogged down. Giving it s shove produced nothing. I couldn’t really believe it but as it was getting colder I abandoned and went home.

The light bulb did not actually come on until I went to bed. Although I have the motor connections colour coded and connected them up as always I suddenly remembered I had had the ESC wires disconnected when I put the rpm sensor back on board. I must have swapped the connections over upstream of my colour coding. Yep props were rotating the wrong way and I had not noticed.

You don’t half feel a plonker sometimes!

Tim.

Denis Watkins22/01/2019 11:31:45
4334 forum posts
104 photos

Easily done Tim

Edited By Denis Watkins on 22/01/2019 12:01:23

Peter Jenkins22/01/2019 12:26:45
1524 forum posts
254 photos

That's what post start engine/motor checks are so valuable. For an IC it is obvious when the engine is running backwards because the exhaust goes the wrong way. Holding an electric and powering up is good and you can also check your failsafe is working correctly, You do check your failsafe before every flying session for every model you intend to fly don't you? It is a requirement of the ANO that the pilot in command must be satisfied that the flight can be completed safely before taking off.

However, we've all been there. The important thing is to learn from experience and don't let it catch you out again.

terry mckenna 122/01/2019 12:28:23
3 forum posts

Wonder it didn't show signs of moving backwards as you applied more throttle.

Tim Ballinger22/01/2019 12:41:19
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778 forum posts
283 photos

Rotation was only wrong on one side and yes it did try and yaw but I misinterpreted that as the port wheel getting stuck and obviously had applied right rudder To stop any rotation and unstick the wheel. All so obvious now.

Tim

J D 822/01/2019 12:44:45
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1447 forum posts
84 photos

Most ic engines will only run one way [ unless modified ] but reed valve types like the COX motors were happy to run in either direction. With the excitment of getting one going and the need to launch one's free flight model before the fuel ran out a rather short flight ensued.

Tim Ballinger22/01/2019 13:03:12
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778 forum posts
283 photos

Now that sparks a memory. Fairly sure it was Cox 049 ( baby bee ? Does that sound right) I had in a Dornier 27 free flight model many years ago. Happily it only flew forwards!

Tim

eflightray22/01/2019 13:58:26
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620 forum posts
132 photos

Always check before release .....

Did the control surfaces waggle when the sticks move, check.

Did it make a right sort of noises, check.

Go for it ......

Anyone got some glue or tape ..... surprise

I think many of us have been there, and put up with the banter smiley

I managed 3 out of the 4 motors turning the right way, (B-17), just cleared the hedge before a, 'what the hecks wrong with this thing' landing.

Ray

Stuphedd22/01/2019 14:23:48
700 forum posts
369 photos

You may feel a bit of a plonker, dont we all sometimes ?, but not as much as the guy on here some years ago says he took his running ic plane out to the patch revved it up to do his checks , and it went backwards !!

He said the problem was that he had put the prop on backwards !! ( Think about it ! )He posted very little after that

I wonder if it was a pusher!

cheers

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