PatMc
-
Posts
6,003 -
Joined
-
Last visited
-
Days Won
4
Content Type
Profiles
Forums
Blogs
Gallery
Calendar
Downloads
Posts posted by PatMc
-
-
1 hour ago, Engine Doctor said:
With old timer models with stick frames dont be tempted to convert to bolt fixings . I know bolt are a tidier etc but If you do c9nvert to bolts and wing tip clips the ground on a bad landing its more than likely to split the fuz. Bands will allow the wing to move without causing any damage and hold wing more than adequate for gentle flight that model is intdnded.
I totally disagree ! Tailplanes on the same models are often glued in place & are usually just as vulnerable.
Rubber bands were great damage limiters for uncontrolled free flight landings which were as likely to be downwind or crosswind as into wind. RC models simply don't need the same protection & because they are subjected to higher "G" throughout each flight than FF rubber bands can be a positive liability.
All of my vintage models have bolt on wings & tailplanes (plastic or steel screws) with zero landing damage resulting. The Junior 60 & the Frankenstein first flew circa 1986.
-
2
-
-
41 minutes ago, Geoff S said:
It's a mostly pointless test. One s/c turn on the motor will render it inoperative without affecting its DC resistance shown on any multimeter. The only useful resistance check is for a complete open circuit.
Yes, I know, just curious if ED does. 😉
Even an open circuit result would require at least 2 of the windings to be OC unless the motor was delta wound, which would be unusual with our motors.
-
12 minutes ago, Engine Doctor said:
...After testing the resistance of the motor i decided to try another ESC and success . ...
How did you test the resistance of the motor, what type of meter did you use & roughly what was the resistance ?
-
6 minutes ago, Nick Cripps said:
Having already "goosed" two speed controllers, I think I would want to check out the other common factor, ie, the motor.
I would remove the motor connectors and check each of the 3 coils with a multimeter on the resistance setting, including moving the wires around a bit to check if there is an intermittent connection or short.
I'm afraid testing the coil resistance with a multimeter would tell you nothing.
-
1
-
-
21 minutes ago, Graham Bowers said:
The concern is if there is a failed cell that results in those remaining being over volted.
It shouldn't with a ballanced charge.
-
Graham, the fact that the motor will start at about half throttle suggests to me that at normal low start throttle setting not enough torque is being produced to move the rotor because the ESC isn't holding the power pulse long for the voltage to build up across the active motor coil winding.
You could try a normal start but spin the motor by hand whilst at a low throttle setting, the motor will probably run OK at this throttle setting (Do this either without a prop fitted or use a chicken stick)
IMO, if it now runs at low speed it confirms that the ESC timings are fundamentally at fault.
BTW the intended motor is very low KV which means it's windings will be relatively high inductance, are the other motors you've tried also low KV & what voltage batteries are you using ?
-
1
-
-
Do the ESC instructions advise calibrating to the Tx ? Even if they don't there's nothing to lose by trying this anyway.
To check the ESC/motor connectors without removing the heatshrink - try running the motor for 10 - 20 secs then feel if any of the 3 connectors are hot. If so that will point to a high resistance/duff solder joint.
-
Not exactly a joke but...
My 94 year old sister is in a care home, thinking of a Xmas pressie for her is always a problem. This year I thought a couple of pairs of non-slip slipper socks would be a great idea.
I picked a pastel pink pair first then thought a Xmas themed design would be nice for the second pair.
I was just about to hit the button on this pair Reindeer pattern when I took a closer look - then decided another pastel coloured pair would perhaps be more suitable for an old lady. 😁
-
12
-
-
4 minutes ago, john stones 1 - Moderator said:
It's a dubious claim that only precision aerobatic models benefit from engine offsets, laws of physics applys to all types with a prop on. Landing with trim in the rudder/elevator causes a reaction would we class that as a precision manouvre ?
A nice line up in the cowl, o.k if it's a static, if it's for flying another story.
Physics is physics and you canna change the laws of physics...Montgomery Scott.
When an r/c model is being flown the applied physics are constantly being changed. The effective thust line is also changing with every change to the wing's AofA.
-
40 minutes ago, Martin McIntosh said:
Interestingly, Spits and Hurries have none as per full size and do not show any adverse effects but then, they were not designed for precision aerobatics.
Very few models are designed for precision aerobatics & even fewer model pilots are capable of executing anything like precision aerobatics.
-
1
-
-
22 minutes ago, kevin b said:
"It's a 9 day old echo" !!!!!!!!
-
It must be even worse if your birthday is on 29th February.
-
1
-
2
-
-
Not sure if this belongs in the Photography section or Chit Chat as it's a pictorial comment on the sudden & extreme change in weather we've just had in Northumberland.
Both pictures were taken from my living room window about the same time mid-morning only 9 days apart.
Friday 24 Nov 2023 Sunday 3 December 2023
In case anyone is wondering both photos are in colour. Coincidentally, if you look closely there's at blue tit in both shots.
-
3
-
-
3 minutes ago, David Davis said:
Several German fighter pilots flew in captured British flying clothing because it was superior to anything they were issued with. Adolf Ritter von Tutshcek perhaps being the most famous. https://en.wikipedia.org/wiki/Adolf_Ritter_von_Tutschek
Yes, the bowler hats were a dead giveaway. 😁
-
2
-
-
The OP doesn't say that the props are necesarily on the same motor/engine or even on the same model.
-
1 hour ago, Terry Plumridge 1 said:
Does a 3 blade prop produce more thrust than a 2 blade ? Same Dia. same pitch, same R.P.M.
Yes it does, so long as the blades are also near identical.
ED is describing a different situation.
-
I nearly always adjust it over a few trial flights to suit my preference for the particular type of model.
BTW, shouldn't we be referring to the lengthwise balance position not the CoG ?
-
I fitted the same module to my earliest version Taranis about 2 or 3 years ago. After flashing the then latest firmware I got mode options: OFF, PPM, XJT, DSM2 , MULTI, R9M, and SBUS. Note no ACCESS which I don't think was operational at the time.
The one you're missing, "MULTI", I'm pretty sure was pointed to via the github link in the instructions.
I haven't got time to look at it right now but will have a look later this pm.
-
4 minutes ago, Flyboy3 said:
When I joined my local club many many years ago ( still a member) there was one experienced member allocated as Safety Officer. He would duly check our models and advise on flying problems if any.
Sounds a good idea if you want to get as many people as possible anti Safety Officer. 😠
-
1
-
4
-
-
41 minutes ago, Shaun Walsh said:
It's a 1400 kv 2212.
Would probably need to drop the prop to an 8x6 to keep within motor and esc current limits.
ESC looks like it should cope with 2-4 cells, should be a label on the ESC.
@Shaun WalshIn the link to the Phoenix (V742-6) @mightypeeshgave the motor size is given as 2812 but no KV is quoted.
Are you quoting from an early version Phoenix ? I have a V742-1 which was supplied with a 2212 1400kv motor same as the Ranger in MP's earlier link.
PS I agree with you that an 8x6 should be about right if the motor is around 1400kv 👍
-
Does anyone know what the motor Kv is ?
It would be easiest to fit a smaller prop & run it within the 20A limit of the ESC.
-
What is printed on the label attached to the ESC ?
-
I agree that it's undesirable for the LE to lift from it's seat under flying but I doubt whether stretching from the front or rear makes any difference.
OTOH the distance from dowel to LE has a significant effect on the tension which can cause the LE to lift especially through loops & other strong positive G manoeuvres.
IMO this is why KK Junior 60s & Super 60s have a mis-identified reputation for weak wing spar construction when in fact the models were designed originally for free flight & S/C rudder/motor control only. Instead of beefing up the wing spar they really need the dowels re-positioned (& a small redesign to the cabin front) or, better still, peg & screw wing retention. The Falcon also looks as if it would benefit from the same treatment.
-
2
-
-
3 hours ago, David Davis said:
Why is it so important to start at the front, stretch it over the wing and attach it to the rear dowel and not the other way round?
1 hour ago, kc said:Maybe you all missed David's point?- I think the advice was to put the bands diagonally which spreads the load a bit instead of concentrating it by running bands right along fuselage edge.
That's not the question he asked.
Wing band size
in General Vintage R/C Chatter
Posted
For what reason ?