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Old Mar 30, 2013, 12:25 PM
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Do you guys use heavy gliders and if so

Do you practice much flying on a closed course?
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Last edited by Directions; Mar 30, 2013 at 11:31 PM.
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Old Mar 31, 2013, 12:37 PM
Master of the Wind
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United States, CA, San Jose
Joined Sep 2008
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I don't practice at all. Just pull the plane out a few weeks ahead to make sure it all works. Mostly fly Dlg. It takes me an hour or so of air time to get used to the big plane again.
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Old Apr 01, 2013, 12:41 PM
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Most everyone is flying planes that are fully loaded to max FAI spec which is 11 lbs.

- Bob -
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Old Apr 03, 2013, 03:29 PM
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Canada
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Quote:
Originally Posted by HLGNut View Post
Most everyone is flying planes that are fully loaded to max FAI spec which is 11 lbs.

- Bob -


max 11lbs dont think so, depend on the wing size>

Only regulation is max wingloading, which is 75 gram/dm2


Cheers
Thomas
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Old Apr 03, 2013, 03:43 PM
Nathan Miller
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Peachtree City GA
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Quote:
Originally Posted by wakumann View Post


max 11lbs dont think so, depend on the wing size>

Only regulation is max wingloading, which is 75 gram/dm2


Cheers
Thomas

You might want to read the FAI rules, max weight of 5 kg
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Old Apr 03, 2013, 03:54 PM
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Quote:
Originally Posted by thermal145 View Post
You might want to read the FAI rules, max weight of 5 kg
You may check in which sub forum you are,
5kg yes in F3B, F3F, but not XC .


XC models WS < 160" are all heavier as 5kg
In Europe the XC scalies often fly with +25lbs

m2c

Thomas
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Old Apr 03, 2013, 05:13 PM
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Beaverton, OR
Joined Apr 2002
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Actually the FAI specs are both 5Kg and 75g/dm2 limits.

Find them here in this link:

http://www.rcgroups.com/forums/showthread.php?t=1618906

XC is F3H starting on page 39.

Since the OP was in the US and asking about weight, that's what I provided.

Lift,

- Bob -
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Old Apr 03, 2013, 06:20 PM
Nathan Miller
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Peachtree City GA
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Quote:
Originally Posted by wakumann View Post
You may check in which sub forum you are,
5kg yes in F3B, F3F, but not XC .


XC models WS < 160" are all heavier as 5kg
In Europe the XC scalies often fly with +25lbs

m2c

Thomas
For setting a world record, yes indeed - re-read the rules again, you'll get it eventually
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Old Apr 03, 2013, 06:47 PM
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USA, IL, Wheeling
Joined Jan 2003
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Class F3H – R/C Soaring Cross Country Racing
SC4_Vol_F3_Soaring_13 Effective 1st January 2013 Page 39
PROVISIONAL RULES
CLASS F3H - RADIO CONTROLLED SOARING CROSS COUNTRY RACING
5.H.1. Rules for Entry
a) Open to any country affiliated with the FAI member National Airsports Control.
b) Each National Airsports Control may enter up to two teams. A team consists of a pilot and up to two helpers, all of whom must be in possession of an FAI Sporting Licence, from their National Airsports Control.
c) Each team shall include one timer who will be assigned by the organisers as official timer for another team. The official timer shall also be responsible to certify distance travelled if less than the full course distance.
d) Each team may enter any number of gliders. Each glider must be flown on the same assigned frequency.
e) There is no restriction on the type or number of chase ground vehicles. Suitable space must be provided in one of the vehicles for the official timer.
f) All gliders shall fall within FAI limitations with regard to size and weight. (Refer to 5.3.1.3., Characteristics of Radio Controlled Gliders).
g) There is no restriction on the number of controls or sensors.
h) All ballast must be carried internally and cannot be jettisonable except for water ballast.

I) All gliders shall bear the FAI Sporting Licence number and national flag of the primary flyer.

5.3.1.3. Characteristics of Radio Controlled Gliders F3B


a) Maximum surface area ..................................... 150 dm2

Maximum flying mass ........................................ 5 kg
Loading .................................................. ............ 12 to 75 g/dm
2



Minimum radius of fuselage nose ...................... 7.5 mm (see template)


The large scale models being flown for GPS racing and the like are probably being flown under the Giant Scale rules, which at least in the USA, would be capped at 55 lbs or else they would need to be examined and granted flying permission under AMA's Large Scale Model program.

Those models would likely not be allowed to fly directly against the 5kg models at an XC meet, although they might be given their own class.

But according to the above, for F3H Provisional XC (and AMA XC and LSF XC tasks), you are limited to 5 kg or 11.023 lbs.
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Old Apr 07, 2013, 03:16 AM
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The FAI wing loading is a bit moot unless your trying to fly a 5kg 3m F3B sized model. Even then at 60dm and a tail of about 10% you still won't break the 75g/dm limit. Any of the modern competitive ships are more like 50g/dm at 5kg.
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Old Apr 08, 2013, 07:58 PM
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San Diego
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You might want to recheck the math on that. 5000g/66dm = 75.75 g/dm
For models like the Fosa the loading at 5 kg is over 80 g/dm
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Old Apr 08, 2013, 10:36 PM
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Seriously the maths thought police are out.

If you reckon a Fosa or ANY 5kg loaded F3B ship is competitive in Cross Country your kidding yourself

Please take your hand off your um err ... Calculator
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Old Apr 08, 2013, 11:22 PM
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San Diego
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Quote:
Originally Posted by tim_mellor View Post
Seriously the maths thought police are out.

If you reckon a Fosa or ANY 5kg loaded F3B ship is competitive in Cross Country your kidding yourself

Please take your hand off your um err ... Calculator
Never said I would consider an F3B ship for X country. I'm also not the one that brought up F3B models in this discussion or suspect math on loading calculations. . .
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Old Apr 08, 2013, 11:36 PM
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I also didn't bother wasting time getting out a calculator or looking up low wing area F3B plane specs.

FAI max wing loading for this class is a pointless number like the 150dm max wing area rule is in F3B.
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Old Apr 09, 2013, 12:07 AM
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San Diego
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Quote:
Originally Posted by tim_mellor View Post
FAI max wing loading for this class is a pointless number like the 150dm max wing area rule is in F3B.
Agreed. Even if someone wanted to experiment with a model like the Egida, they wouldn't exceed the 75 g/dm2 limit even if they were crazy enough to try flying it at 5 kg.
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