*** CG Wizard *** by Digitech
06-16-2017, 06:42 AM
#251
Ok Chris that all makes sense. My questions are...
how do you calculate flight attitude? Some planes fly slightly nose up....
why if the planes have to be flight level.... does my buddy's Xicoy read a 90 gram difference in the opposite way when weighing not flight level. Both the xicoy and the wizard should read the same when weighing the plane.
how do you calculate flight attitude? Some planes fly slightly nose up....
why if the planes have to be flight level.... does my buddy's Xicoy read a 90 gram difference in the opposite way when weighing not flight level. Both the xicoy and the wizard should read the same when weighing the plane.
Watch your buddy's jet at medium to full throttle. If a model flies slightly nose up you have to determine why. It may be rigged improperly or the CG is off. Remember, that nose high cruise condition is creating extra drag affecting fuel endurance. We do not use landing approach, 3D flight speeds, or slow flight attitude for calculating CG.
A difference in load cell readings between Xicoy, and CG wizard is not unusual. It does not mean the systems are wrong or unusable. Load cells are notoriously fickle and affected by temperature, humidity, breezes, winds, and mechanical calibration. The cups on cheaper load cells need to move so that they do not bind or they can generate errors. Always insure the weight applied is centered in the load cell.
Even our multi-Thousand dollar load cells at work, that are certified for aircraft use, and calibrated every 180 days, will vary in their readings slightly. That is why in the real world we take a minimum of three readings per load cell and average them before recording the value. We only weigh airplanes in side hangars.
I do the same with models. Indoors only. I lift each gear off of the scale, let the scale zero, then set it back down and note the reading. I do that three times for each gear then use the averages in the calculation just like the full scale.
06-16-2017, 07:08 AM
#252
Join Date: Jun 2015
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Is there a third party app that we can take the average weights and input them.
I know different environments effect outcome. But I agree I did not level my plane. But I did use both xicoy and wizard back to back. Scales in same location. Everything was double checked ( we weighed plane more then once) the wizard said add 40g the xicoy said subtract 50g. After subtracting 50g then placed plane on ez ballancer plane ballanced. After adding 40g the plane tip forward significantly on the EZ balancer. I believe your in the US and I'm sure I have to be doing something wrong. Maybe we can talk this threw on the phone.
I know different environments effect outcome. But I agree I did not level my plane. But I did use both xicoy and wizard back to back. Scales in same location. Everything was double checked ( we weighed plane more then once) the wizard said add 40g the xicoy said subtract 50g. After subtracting 50g then placed plane on ez ballancer plane ballanced. After adding 40g the plane tip forward significantly on the EZ balancer. I believe your in the US and I'm sure I have to be doing something wrong. Maybe we can talk this threw on the phone.
07-13-2017, 04:30 AM
#253
Hi Guys some news about differences , we think we found the issue why one measures different then the other.
we think some of you have a laser misalignment , maybe becasue of transport or other issue.
Please check the following.
measure old style first : hang a small weight from your models current ! CG towards the table , measure this between the back side of the sensor up to the center of the hanging weight.
this is your CG. now double check that distance with your laser pointing to that point and measure center of the laser to the backside of the sensor it should be the same!.
if not tip central box a bit over and use a small piece of tape to "thicken" the side so that it will measure centrer , this is for now the only solution.
Double check with the APP it should read correct (plane level flight)
if you dont want to use the laser anymore just go for the wire ! make sure also in this case your model is Level!.
what you also can do is a 90 degree measure tool and point the tip upwards.make sure table is level!
we are lookning how to find a fixed solution but as we said you can always use the wire method!.
Sandor
we think some of you have a laser misalignment , maybe becasue of transport or other issue.
Please check the following.
measure old style first : hang a small weight from your models current ! CG towards the table , measure this between the back side of the sensor up to the center of the hanging weight.
this is your CG. now double check that distance with your laser pointing to that point and measure center of the laser to the backside of the sensor it should be the same!.
if not tip central box a bit over and use a small piece of tape to "thicken" the side so that it will measure centrer , this is for now the only solution.
Double check with the APP it should read correct (plane level flight)
if you dont want to use the laser anymore just go for the wire ! make sure also in this case your model is Level!.
what you also can do is a 90 degree measure tool and point the tip upwards.make sure table is level!
we are lookning how to find a fixed solution but as we said you can always use the wire method!.
Sandor
07-13-2017, 04:37 AM
#255
i had the same problem with 1 other customer we spend a few hours figuring what the heck was going on.
we double check now that all CB have a min deflection of the laser.
best is to keep the distance as short as possible between CG and laser , on this case we had a failure of 10cm on 2 meters hight.
so on average of 20cm measuring the difference could be up to 20mm! and that is a lot
07-18-2017, 04:04 AM
#264
** CG Wizard 2.0 is released **
Few updates and upgrades!
over 250 sold allready! its time for a upgrade.
The newer version 2.0 is now made from Full aluminium 7076 blue anodised.
Laser engraved
Bottom and top Aluminium
Centercover 3D printed PLA
USB cable is now Fixed inside sensor.
Software changes : inch OZ fract / Inch / OZ Decimal MM / grams
Software is backwards compatible so works also on the older CG Wizard.
Newer type sensors work also on the First gen CG Wizard.
Software release :
Iphone is under review from apple
Android is uploaded this or next week.
over 250 sold allready! its time for a upgrade.
The newer version 2.0 is now made from Full aluminium 7076 blue anodised.
Laser engraved
Bottom and top Aluminium
Centercover 3D printed PLA
USB cable is now Fixed inside sensor.
Software changes : inch OZ fract / Inch / OZ Decimal MM / grams
Software is backwards compatible so works also on the older CG Wizard.
Newer type sensors work also on the First gen CG Wizard.
Software release :
Iphone is under review from apple
Android is uploaded this or next week.
07-18-2017, 11:41 AM
#265
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Join Date: Oct 2010
Location: Hvidovre, DENMARK
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Hi Sandor,
A Quick Question: Is it possible to store measurements in the app? My thoughts goes, when playing with optimal CG over a period of time you could store the measurements with a after-flight comment??
BR Ole, Copenhagen Denmark
PS: thx for the deal with your Classic Flash :-)
A Quick Question: Is it possible to store measurements in the app? My thoughts goes, when playing with optimal CG over a period of time you could store the measurements with a after-flight comment??
BR Ole, Copenhagen Denmark
PS: thx for the deal with your Classic Flash :-)
07-18-2017, 10:38 PM
#266
Hi Sandor,
A Quick Question: Is it possible to store measurements in the app? My thoughts goes, when playing with optimal CG over a period of time you could store the measurements with a after-flight comment??
BR Ole, Copenhagen Denmark
PS: thx for the deal with your Classic Flash :-)
A Quick Question: Is it possible to store measurements in the app? My thoughts goes, when playing with optimal CG over a period of time you could store the measurements with a after-flight comment??
BR Ole, Copenhagen Denmark
PS: thx for the deal with your Classic Flash :-)
07-22-2017, 05:36 AM
#270
Join Date: Jun 2015
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Ok. Ready to do some testing. I know in the past it was stayed that the laser / box had to be placed a certain way. But since my laser isn't accurate can i just push that to the side and use another laser or is there a particular reason that the box needs to be close to the cg
07-25-2017, 12:01 AM
#271
Ok. Ready to do some testing. I know in the past it was stayed that the laser / box had to be placed a certain way. But since my laser isn't accurate can i just push that to the side and use another laser or is there a particular reason that the box needs to be close to the cg
no there is not , however we set the laser so that you need to keep the box so that the front cable points towards the front sensor. this is the most accurate measuring.