If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
Scales for Weight and Balance
On Monday, May 4, 2020 at 10:41:50 PM UTC-7, 2G wrote:
On Monday, May 4, 2020 at 1:16:42 PM UTC-7, wrote: On Sunday, May 3, 2020 at 12:59:41 PM UTC-4, wrote: Hello All, Las Vegas Valley Soaring is currently restoring our beloved SGS 1-26D and will need to establish a new empty weight CG once finished. Does anyone know where I might source a borrowed or rented set of scales? Thanks! Dennis Ballew Vice President Las Vegas Valley Soaring. Schweizer documentation indicated that, if no big scale is available, use 2 bathroom scales with a board across them. FWIW UH Electronic scales that measure up to 300 kg are available for under $100. I calibrated a pair of bathroom scales by going to an immediate care clinic with a backpack loaded with about 50 lbs of weights. I asked to use their patient platform scale, which they gladly agreed to. I weighed myself with and without the backpack. I then weighed myself the same way on both bathroom scales (they were surprisingly accurate). The most critical measurement is the tail weight as it has the longest moment arm. I would check the scale this way as close as possible to the expected tail weight. One thing to keep in mind is that any breeze will upset this measurement. Either find a hangar you can do this in, or go out early and do it on a calm day. Tom Buy 3 of these for $34.99 ea free Prime shipping. Make a ramp to use 2 on the main wheel and one for the tail. 440 lbs capacity ea. https://www.amazon.com/Smart-Weigh-S...xpY2s9dHJ1ZQ== Richard |
#12
|
|||
|
|||
Scales for Weight and Balance
Buy 3 of these for $34.99 ea free Prime shipping. Make a ramp to use 2 on the main wheel and one for the tail. Those look great. I think I would use some 3/4 plywood scraps to help out the force summer in each scale. Two square scraps for the tail wheel and 2 rectangular scraps to couple the two for the main. (That's an old trick from the guys at a scale company I did s/w for) |
#13
|
|||
|
|||
Scales for Weight and Balance
On Tuesday, May 5, 2020 at 4:57:52 AM UTC-7, Richard Pfiffner wrote:
On Monday, May 4, 2020 at 10:41:50 PM UTC-7, 2G wrote: On Monday, May 4, 2020 at 1:16:42 PM UTC-7, wrote: On Sunday, May 3, 2020 at 12:59:41 PM UTC-4, wrote: Hello All, Las Vegas Valley Soaring is currently restoring our beloved SGS 1-26D and will need to establish a new empty weight CG once finished. Does anyone know where I might source a borrowed or rented set of scales? Thanks! Dennis Ballew Vice President Las Vegas Valley Soaring. Schweizer documentation indicated that, if no big scale is available, use 2 bathroom scales with a board across them. FWIW UH Electronic scales that measure up to 300 kg are available for under $100. I calibrated a pair of bathroom scales by going to an immediate care clinic with a backpack loaded with about 50 lbs of weights. I asked to use their patient platform scale, which they gladly agreed to. I weighed myself with and without the backpack. I then weighed myself the same way on both bathroom scales (they were surprisingly accurate). The most critical measurement is the tail weight as it has the longest moment arm. I would check the scale this way as close as possible to the expected tail weight. One thing to keep in mind is that any breeze will upset this measurement. Either find a hangar you can do this in, or go out early and do it on a calm day. Tom Buy 3 of these for $34.99 ea free Prime shipping. Make a ramp to use 2 on the main wheel and one for the tail. 440 lbs capacity ea. https://www.amazon.com/Smart-Weigh-S...xpY2s9dHJ1ZQ== Richard Be careful. Here is one review: this scale sucks! it is not accurate and got 5 out of 6 box weights wrong when I took them to the UPS they were all a few pounds over what the scale had told me. one of them was wrong by 8 pounds. Using a scale so far off to do a W&B can lead to very significant errors if used to weigh the tail. A 1 lb error in measuring the tail weight of an ASH26e, for example, will result in a 3.3% error in the CG. An 8 lb error results in 26% error, which can be deadly. Tom |
#14
|
|||
|
|||
Scales for Weight and Balance
Ask the local soapbox derby crew. They have good calibrated digital scales usually.
|
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
ASK-21 Weight and Balance | Carl Baxter | Soaring | 4 | June 2nd 11 02:57 PM |
PA-32 Weight and Balance | John Doe | Owning | 14 | May 23rd 06 01:03 AM |
L23 weight and balance | Tony Verhulst | Soaring | 5 | December 31st 05 01:54 AM |
Weight & Balance DVD | jon | Home Built | 0 | October 8th 05 05:39 PM |
Weight and Balance | JP | Piloting | 2 | January 13th 04 10:54 AM |