Search: Posts Made By: r_kopka
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09-04-2020, 09:53 AM
Replies: 64
Views: 16,830
Posted By r_kopka

For maidens I prefer a foreign toss so I can...

For maidens I prefer a foreign toss so I can react immediately on every unknown movement of the plane. Afterwards I can do it on my own with Mode2. With some experience the right hand is back at the...
Forum: Beginners
06-21-2013, 09:39 AM
Replies: 25
Views: 4,205
Posted By r_kopka

I have a very puffed battery at my working place...

I have a very puffed battery at my working place for years now for quick tests. FPV is another usage for low current. Others are e.g. lighting systems.
From a current viewpoint also RX supply would...
Forum: Beginners
06-18-2013, 04:04 PM
Replies: 25
Views: 4,205
Posted By r_kopka

I am/was at one with that. But lately I had a not...

I am/was at one with that. But lately I had a not so funny experience.

TREX700 12s5000 (6s+6s) max.current about 80A

I had an older pack with one battery slightly puffed. I just wanted to try...
Forum: Humor
06-18-2013, 03:42 PM
Replies: 15
Views: 2,864
Posted By r_kopka

Or in a variation of that: Why is it that...

Or in a variation of that:

Why is it that the more you want to get rid of a model the more it tends to survive all kinds of crashs and flight errors ?



Sounds much too familiar :-(

RK
Forum: Power Systems
02-26-2013, 03:58 PM
Replies: 28
Views: 2,995
Posted By r_kopka

The problem with brushed motors is that there are...

The problem with brushed motors is that there are only big and expensive motors with low rpm/Vs. So you probably need a (8) gearbox(es). Especially if you want to go 4-bladed.

A cheap brushed...
Forum: Beginners
01-30-2013, 03:21 PM
Replies: 33
Views: 5,212
Posted By r_kopka

It also works the other way round. My...

It also works the other way round.

My Catalina(HVP 1,4m) had a heavy NiCd and brushed motors before. It barely came of the water and was a brick to fly. For a looping you had to use exactly the...
01-30-2013, 02:08 PM
Replies: 84
Views: 69,166
Posted By r_kopka

To be exact it is an Austrian site - but we share...

To be exact it is an Austrian site - but we share nearly the same language :-)

RK
01-10-2013, 12:57 PM
Replies: 40
Views: 11,119
Posted By r_kopka

What's even more important is storage for several...

What's even more important is storage for several models. If you get a sailpane with flaps it certainly will not be your first and only model. So a computer radio is needed. And even the entry models...
12-05-2012, 02:55 PM
Replies: 5
Views: 2,551
Posted By r_kopka

I haven't found any strips NOT for 12V !? As said...

I haven't found any strips NOT for 12V !? As said an adaptor between the battery and the ESC is fine. That way you can also fly without light and test the light without motor.

Color strips are...
Forum: Beginners
10-20-2012, 09:39 AM
Replies: 35
Views: 5,878
Posted By r_kopka

There seems to be some misunderstanding. ...

There seems to be some misunderstanding.

Weight distribution stays valid.

With a two pack system (independent of the number of motors but for each comparision the same number) you need exactly...
Forum: Beginners
10-19-2012, 09:21 AM
Replies: 35
Views: 5,878
Posted By r_kopka

But the single pack has 12% more capacity and...

But the single pack has 12% more capacity and only 18% more weight. 3,6% difference pro double. But you also need more cabling. So more or less the same. On the other hand your single pack has 40/50C...
Forum: Beginners
10-17-2012, 04:32 PM
Replies: 35
Views: 5,878
Posted By r_kopka

If you use two it is safer to connect them in...

If you use two it is safer to connect them in parallel or you could have one ESC shut down before the other which is no fun.

RK
09-05-2012, 02:51 PM
Replies: 41
Views: 5,066
Posted By r_kopka

For me only with something as easy to fly as ES...

For me only with something as easy to fly as ES or Funcub. I would never fly a heli or a pylon even later in the afternoon when the light comes in rather low. I just lost too many helis because I...
08-24-2012, 09:22 AM
Replies: 33
Views: 4,695
Posted By r_kopka

I don't have exact numbers for my current Helis,...

I don't have exact numbers for my current Helis, but the old ECO8 (~1,5kg) needed max. 20A at 10Nicd (~200W) for a hover. A 3D-plane with that weight will need at least 300W (IMHO), probably much...
08-23-2012, 10:27 AM
Replies: 33
Views: 4,695
Posted By r_kopka

A smaller prop spinning at a higher rpm is...

A smaller prop spinning at a higher rpm is usually LESS efficient. That's why you find them only at fast planes where you need a prop that works even at high speeds. Every other plane tries to use...
08-22-2012, 04:10 PM
Replies: 33
Views: 4,695
Posted By r_kopka

Don't know for that engine but for several...

Don't know for that engine but for several smaller ones the max Hp value is taken at very high rotations which wouldn't work with any useful prop. So if you calculate the values for a real usage...
Replies: 8
Views: 3,075
Posted By r_kopka

We had a reproducible case where a cell phone...

We had a reproducible case where a cell phone which gets a call can disturb a Multiplex TX (with 35MHz and Synthesizer - don't know if that's relevant). But that must be quite near, at most a meter....
06-27-2012, 12:44 PM
Replies: 7
Views: 1,733
Posted By r_kopka

Who is interested in a Funjet a low speed :-) ...

Who is interested in a Funjet a low speed :-)

It is easy to start and to land (even with higher weight). The rest of the time the throttle is at max.
I have quite high throws to get high roll...
Forum: Beginners
06-20-2012, 04:55 PM
Replies: 18
Views: 7,846
Posted By r_kopka

The Mentor also has a 2piece wing (like its...

The Mentor also has a 2piece wing (like its predecessor the Magister). But I glued them to one piece as 1,6m ist easy to transport for me and it is stronger. I also don't separate the Funcub Wings.
...
Forum: Power Systems
06-15-2012, 01:32 PM
Replies: 5
Views: 4,413
Posted By r_kopka

(sorry, but most in german) ...

(sorry, but most in german)

http://members.aon.at/flug.fiala/sicher.html#4
But there is only a mention of (S)PCM RX. I don't know if it concerns 2G4, too.
...
Forum: Power Systems
06-14-2012, 09:16 AM
Replies: 5
Views: 4,413
Posted By r_kopka

There were several threads regarding problems...

There were several threads regarding problems with high speed digital servos and this circuit. RX did reset itself when some servos were moved fast. The idea was that the servo motor current spikes...
06-13-2012, 09:55 AM
Replies: 33
Views: 8,616
Posted By r_kopka

There is a point. My first idea was to...

There is a point.

My first idea was to connect 2-3 servos or a RX(only) to each BEC, as the BEC is in the engine pod the connection would be rather short.
Then I thought about combining the BEC...
06-13-2012, 09:39 AM
Replies: 33
Views: 8,616
Posted By r_kopka

Knapp is not very far from my working place. I'm...

Knapp is not very far from my working place. I'm in a similar business.

Yes.

For electric retracts it might be safe to use a separate supply. These things can draw lot's of current. The better...
06-13-2012, 09:31 AM
Replies: 33
Views: 8,616
Posted By r_kopka

If we assume a BEC is strong enough it doesn't...

If we assume a BEC is strong enough it doesn't change much if it's extern or intern. Only if the ESC blows up it could also kill the BEC.

And RX batteries are another failing point. It's another...
06-12-2012, 04:19 PM
Replies: 33
Views: 8,616
Posted By r_kopka

> 3s and linear BEC is always a problem ...

> 3s and linear BEC is always a problem

connecting two BECs directly is no good idea

But why disable both BECs ? If one is strong enough for all servos - FINE.
If one is good enough for half...
05-15-2012, 12:45 PM
Replies: 29
Views: 14,096
Posted By r_kopka

But these are digital links that correct and hide...

But these are digital links that correct and hide many errors (as do our RC 2G4 systems). Without some sort of telemetry you cannot say there is no interference.

2G4 noise - WLAN, radio...
04-13-2012, 12:16 PM
Replies: 5
Views: 3,585
Posted By r_kopka

The outstanding thing about the Storch(full size)...

The outstanding thing about the Storch(full size) is its slowflying capability. That should also remain in a model and for that flaps are very useful.

RK
Replies: 16
Views: 3,609
Posted By r_kopka

You can use a simple ring screw. ...

You can use a simple ring screw.

http://kopka.at/Modelle/ff6_1.JPG

RK
01-09-2012, 11:06 AM
Replies: 28
Views: 3,598
Posted By r_kopka

TX Bags as mentioned are bad for models to be...

TX Bags as mentioned are bad for models to be thrown. It works, but you have to be fast and precise to get into the bag. Seeing the Display is impossible or difficult, switches can be set...
10-07-2011, 10:40 PM
Replies: 13
Views: 4,249
Posted By r_kopka

Better take 3s from the balancer cable. The...

Better take 3s from the balancer cable. The current is not so high so it won't disbalance the battery much.
Typical BECs don't give you 12V.

RK
Showing results 1 to 30 of 163
 


 
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