Do I need a governer

[darrens]

Yep 30C upwards (most people use 30C minimimum in Trex 450's etc) are almost flat untill the last 10% where we should not be in any case. I use the new 45C and 50C cells (i think they are actually the same but rated different by the two major manufacturers) so imagine how flat they will be.....hence my stable voltage/head speed comments.

[scallybert]

Yep 30C upwards (most people use 30C minimimum in Trex 450's etc) are almost flat untill the last 10% where we should not be in any case. I use the new 45C and 50C cells (i think they are actually the same but rated different by the two major manufacturers) so imagine how flat they will be.....hence my stable voltage/head speed comments.

Hang on - are you sure you've read the graphs right ?

The ones on here (3/4 way down, "How to use Li Po batteries effectively") FMA Direct : LiPo Handbook - Section 3 (which seem similar to the others), have different graphs not by battery, but by discharge current; the current being expressed in terms of 'C'.

I believe the batteries are all the same battery, or type.

Now, the flatter graphs are with higher current.

Maybe this is a better one: Attachment browser: TP-1300-25C-Prototype.gif by everydayflyer - RC Groups .

The flattish curves are with a sustained current of 25C. That's hammering things somewhat (IMO), and corresponds to a ~2.5 minute flight. (1C would be a ~60 minute flight).

A 6 minute flight would be ~10C, which is a much more inclined curve. 10 minutes (~6C) even more so.

There's a school of thought that reportedly gets good results by running 100% throttle (non-governed). I'd be interested to see what a data logger made of this; to see if their headspeed is anywhere near constant, and what the V & A are doing.

[darrens]

yeah sorry Scally, should have said I went off looking at various graphs from Thunderpower and Flightpower (now Eon) and found a few showing stability of discharge voltage over various different pack configs. The discharge current was the same and it showed the higher C packs to be more voltage stable i.e. flatter discharge curve. I'll go trawl again and see if I can post what I found. I kinda assumed your graph was showing the same and didn't look close enough....oops!
I favour govenor mode which is why I buy Kontronic esc's, have found it to work better as it uses higher switching frequncy I believe. The Align ones for example appear to switch at a much lower frequency and cause the tail to wag!!!
Obviously on gov mode the esc will pull more current to make up for any slight voltage drop, so it appears to be entirely cosistant throughout flight.

either way, guess we have jointly answered the question that a govenor (while not essential) is generally preferred.

Cheers
D

[supamansuper]

Glad you guys have managed to kiss and make up .So the answer is its down personal preference whether to us a governer or not.

[malloryn]

I just fitted a revlock 10 today and I'd say it does make a difference, even more so for a beginner.
I setup for 1500 rpm ( ELYQ Vision 50 ) and this made the heli quite docile and easy to handle - ideal for a beginner.
I found using the throttle curves is alway a bit hit and miss and need adjusting for mid stick hover depending on the conditions ( easy enough on the DX7 ).
The lower rpm would also give you longer pratice time.