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Topic: Dodosim not starting up< Next Oldest | Next Newest >
choppercharlie
(HC439CH)
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Group: Student Pilot
Posts: 187
Joined: Feb. 2011
Posted: June 25 2017,21:56

Hi Guys!

I'm sure something similar has been discussed before, but couldn't find anything....
I'm sure its just a small issue to sort out.....my Dodosim was working perfectly before, and a few days ago, when I start the heli up in training mode as before, the turbine winds up to 58%, and then stops ....and winds down to zero....

I have not made any changes to anything in between working before, and not working now.

Any idea what I can do???!!

Thanks

Charlie
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Bluebottle
(HC154BL)
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Group: Certified Pilot
Posts: 3375
Joined: Jan. 2004
Posted: June 25 2017,23:13

Sounds like your collective is not fully down causing excess drag on the blades -

Check the physical travel of the collective
Check calibration of collective.
Check rotor brake isn't being applied


--------------
Mark Adams     U.K.    Hovercontrol Certified Pilot

Bluebottle: Flying insect with unsavoury habits,
incapable of flying in a straight line, often lands inverted.
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Simon853
(HC685SI)
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Group: Member
Posts: 2309
Joined: Sep. 2005
Posted: June 27 2017,18:41

If the rotor rpm has not passed about 25% rpm by the time the engine gets to 58% then it could be that something is causing a bit of drag on the blades.  We have observed that there seems to be a quirk in the underlying MS blade drag coding that can cause this if the helicopter is either: rocking on water, at higher elevation and not on flat ground, in a moderate to strong wind at high elevation.

There's not a lot you can do if you're using the fully automatic start because your controls are locked out during the auto-start, but if you're doing a manual start then there's a couple of things you can try:

1) Raise the collective and then dump it quickly.  This can help it just jump over the sticking point.

2) Increase the engine throttle.  This dumps more fuel into the engine to help accelerate the blades.

Ensure you're continuing to hold down the starter until the rotor rpm has passed 25% and the N1 has passed 58% during these actions.

Si
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choppercharlie
(HC439CH)
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Group: Student Pilot
Posts: 187
Joined: Feb. 2011
Posted: June 27 2017,19:35

Thanks you all at Dodosim for your quick response ......

I managed to sort out the problem....I had to adjust the POT on my collective ....it somehow slipped one or two gears back and didn't go all the way down....causing drag on the rotors....as you suggested...did some calibration and its working like a dream again.....

Thanks!!!
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3 replies since June 25 2017,21:56 < Next Oldest | Next Newest >

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