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Old Jan 16, 2011, 01:49 PM
Chris R
United Kingdom
Joined Dec 2009
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Wing or glider?

Which one would be idea for getting very high up?

Im thinking 3000m+
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Old Jan 16, 2011, 09:16 PM
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Search for Bracky72:

http://www.rcgroups.com/forums/showthread.php?t=1153401

He has an 11,000+ ft flight with a stryker
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Old Jan 16, 2011, 10:01 PM
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What kind of TX/RX combo will give that kind of range?
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Old Jan 16, 2011, 11:08 PM
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Many of them will. THat is just over 2 miles. Many tx/rxs can easily acheive that.

BUT if I had to guess Bracky was using a Lawmate 2.4 ghz 500 mw TX and Lawmate Rx, since that was what was on his build log for his Stryker.
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Old Jan 16, 2011, 11:40 PM
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if a stryker can, i guess a skyfun or funjet can reach 3000 too,
there is a video of Alejandro Villa with a maxi swift going up to 2300m, so maxi swift looks capable for this too,
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Old Jan 17, 2011, 02:02 AM
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Multiplex Cularis @ 5000m

Flying Paul meets FPV Teil 1 (FPV High Altitude 15000 feet / 5 km) (8 min 2 sec)
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Old Jan 17, 2011, 02:38 AM
Chris R
United Kingdom
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My current FPV platform is a Maxi Swift, i take it prop size has a say on max altitude?
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Old Jan 17, 2011, 02:51 AM
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The post below is semi-relevant to this thread.

http://www.rcgroups.com/forums/showp...7&postcount=58
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Old Jan 17, 2011, 03:02 AM
Chris R
United Kingdom
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Ian your saying you have 3/4 the thrust + 3/4 the lift at 11,000ft? roughly!

Taking this into consideration when working out if you have enough power to reach that high.
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Old Jan 17, 2011, 03:11 AM
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Quote:
Originally Posted by Cir2kuk View Post
Ian your saying you have 3/4 the thrust + 3/4 the lift at 11,000ft? roughly!

Taking this into consideration when working out if you have enough power to reach that high.
Indeed. The density of air at 10,000ft is only 74% of what it is at sea-level.

As a result, you'll only get 74% of the max thrust from the prop, 74% of the lift generated by the wings and all powered by a battery with probably a far lesser percentage of its capacity left.
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Old Jan 17, 2011, 03:17 AM
Chris R
United Kingdom
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I try to keep 1:1 power to weight ratio

1.0kg maxi swift + 25% more weight to make up for less lift = 1.25kg

So would need about 1.5kg+ of thrust to make it too 10,000ft.
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Old Jan 17, 2011, 03:25 AM
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My Easy Star reached 8900ft with only a 200W motor and a 0.75 thrust/weight ratio, so you should have plenty of grunt with your set-up. That said, it took me AGES to get up to that altitude, so you should scale it far faster.
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Old Jan 17, 2011, 03:33 AM
Chris R
United Kingdom
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Pretty sure i have plenty power to get there!! still testing my rc+vtx range

Gonna try for 5000ft first and go from there, cheers for your help.
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Last edited by Cir2kuk; Jan 17, 2011 at 04:00 AM.
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Old Jan 17, 2011, 03:45 AM
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Cool - look forward to hearing how you get on!
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Old Jan 17, 2011, 03:07 PM
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Quote:
Originally Posted by Ian Davidson View Post

As a result, you'll only get 74% of the max thrust from the prop, 74% of the lift generated by the wings and all powered by a battery with probably a far lesser percentage of its capacity left.
Yes but you have to consider the drag is also smaller
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