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« on: May 21, 2020, 01:14:40 AM »
Nirup MS
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Hey guys,
I recently bought a RCBazaar skysurfer v4 kit(without electronics).The skysurfer v4 motors were out of stock so i had to use my spare motors.I was about to use my 1400kv a2212 motors ,but the props of these motors were too big.I had another motor (Readytosky rs2205 2300kv)which i used with 6inch prop included with the skysurfer. When I did the thrust test on this motor,i got thrust about 400g on full throttle and 200g on half throttle.The weight of the plane is about 800g.So the thrust to weight ratio is 0.5:1 ....,I am Still a begginer..,i have made 3 planes till now and non of them have lasted more than 10secs...so i still dont know how to fly a plane..I just wanted to know whether i will be able to have a good flight with this thrust to weight ratio..I just dont want to crash even this plane.So plz help me out,....I'm using a 30a esc, 2200mah 3s lipo,rs2205 2300kv motors...
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« Reply #1 on: May 21, 2020, 07:34:22 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth



How did you measure the thrust?

It does seem the motor is underpowered

Sent from my motorola one power using Tapatalk
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« Reply #2 on: May 21, 2020, 09:46:41 PM »
bessie
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Hi
  What battery do u use
weather 3s or 2s
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« Reply #3 on: May 21, 2020, 09:55:38 PM »
Somnath Maji
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What is the plane weight (with full electronics)?
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« Reply #4 on: May 21, 2020, 10:30:40 PM »
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@ Nirup MS,
Hi,
If you have seen a Skysurfer fly, you would have noticed that it flies quite well with the power off. It glides, losing height gradually.

Very little power/thrust is required to maintain altitude.
Extra power is required for climbing.
It is completely wrong to think that such a model needs 1:1 power to weight ratio to climb safely.

I have a 64” Sunbird that weighs just under 400 gms. It cruises (ie, holds altitude) easily at 100gms thrust (25w). And climbs safely from a hand launch at 150 gms thrust. (These are measured values, not guesses).

The Skysurfer with original motor is hand launched fairly fast and with the nose pointing up ~10-15 degrees. This is due to the unusual thrust line, which pushes the nose down at high power/ low airspeed (as at launch)

However, a nose high launch is unsuitable when the model is suspected to be underpowered.

My suggestion is to run the motor at half throttle and hand launch in a level attitude at a jogging pace.
As the power will be inadequate to climb, the model will probably fly at the same level, or descend gradually. Increase throttle gradually. I expect it will climb away gradually.

Remember three things.
1. Check that the CG ls at the correct location, as specified.
2. DO NOT PULL UP ELEVATOR IN LOW POWER CONDITIONS.
3. Do not use full throttle continuously as the 2300kv motor will probably overheat with the 6” prop when using 3s lipo.

Here’s a short video of hand launch and climb out of the Sunbird. The Skysurfer on full power climbs much faster



Best wishes for your test flights.



8916E9E0-5051-4C05-8E5A-DF4B7DE4FBAF.jpg
Re: Help to choose motor for my skysurfer v4
* 8916E9E0-5051-4C05-8E5A-DF4B7DE4FBAF.jpg (55.62 KB, 800x470 - viewed 100 times.)
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« Reply #5 on: May 21, 2020, 11:14:09 PM »
Nirup MS
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Somnath Maji The weight of the plane with all the electronics is 790 grams.
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« Reply #6 on: May 21, 2020, 11:16:26 PM »
Nirup MS
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K K Iyer Thank u sir ...I will soon go for a test flight and post the results.
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« Reply #7 on: May 21, 2020, 11:17:04 PM »
Nirup MS
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Bessie i am using a 3s 2200 lipo..
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« Reply #8 on: May 21, 2020, 11:31:07 PM »
Nirup MS
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sanjayrai55 I kept the weighing machine against the wall and put the nose of the surfer on it and gave full throttle.At 50% i got about 200 grams and at 100% i got about 400-420grams..
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« Reply #9 on: May 22, 2020, 07:43:54 AM »
Somnath Maji
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In case of gliders - thrust to weight ratio up-to  1:2
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« Reply #10 on: May 22, 2020, 08:03:07 AM »
ashok 2010
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the thrust of your motor should be enough
advice given by seniors sanjayrai55, K K Iyer above is absolutely  correct.

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« Reply #11 on: May 22, 2020, 09:53:49 AM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth




the thrust of your motor should be enough
advice given by seniors sanjayrai55, K K Iyer above is absolutely  correct.


Nice testing rig  Thumbs Up Thumbs Up
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« Reply #12 on: May 22, 2020, 01:15:56 PM »
Nirup MS
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Thank u guys for all ur support....
I just have one really last question......Today i tested out the motor with a 5045 triblade prop and found out that it gave a little more thrust than the 6 inch(About 10 grams more)but thats not a big difference.. but there were less vibration when i used the 5045 prop and motor was found to be running smooth than what it used to on the 6 inch...sooo which one should i use , the recomended 6 inch or the 5045...
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« Reply #13 on: May 22, 2020, 02:23:50 PM »
Somnath Maji
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APC style 5045 prop will give you more thrust than the normal one
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« Reply #14 on: May 22, 2020, 10:27:43 PM »
Nirup MS
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Somnath Maji thank u...
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