|
|
|
|
|
|
|
|
|
Latest blog entry: This season's 3D line up...
|
|
|
|
||
|
|
Quote:
![]() I went to BOD meeting last night . Ian spent 1/2 hour going over FPV rules to be submitted to King Co. He need to make a few changes and next meeting we will review them. Went over the DB testing and how to use the DB meter and fill out the proper paperwork . Talked about MAR/C All Members Survey 120 members took the last two months. |
|
|
|
||
|
|
Quote:
Thank you for representing all of us at the MARC. Looks like I can't keep my mouth closed on the db issue. Steve or Joe is there anyway you can possibly influence the MARC board to standardize there db test to be consistent with the AMA test protocol? MARC current Test Protocol: The sound meter will be used in the “A” weighting position and “Fast” switch position. Momentarily press the “Hold” button so that the meter will retain the maximum dB level; following the test, show the level on the meter to the flyer. Position it 25 feet from the model in the plane of the prop at a height of 2-3 feet and with no noise reflecting objects within three feet. Point it directly at the model and have the engine run at full power. Link to MARC sound Abatement Rule: http://mar-c.org/sites/default/files...%20PROGRAM.pdf The issue and inconsistency with MARC's db test protocol is that the tester is holding the db meter while performing the db sound level test. This causes sound reflection of roughly 1db which in turn lowers the passing db threshold to 89db instead of 90db which is the intended sound abatement target db. 1 db doesn't seem like much however keep in mind db's are exponential in nature not incremental. i.e. the higher the db number means exponentially more noise. Here is AMA's competition db rule. Note they use a stand for testing thus eliminating the sound reflection issue. 4.2: Noise Limit: Each internal combustion engine shall be equipped with an effective silencer. The maximum noise level for all AMA classes shall be 96 decibels measured at three (3) meters from the centerline of the model. All measurements will be taken perpendicular to the fuselage centerline from the right hand side of the model. The nose of the model will be pointed directly into the wind and the microphone will be placed on a stand 30 centimeters above the ground and in line with the motor. No noise reflecting objects shall be nearer than three (3) meters to the model or microphone. The measurement will be made while the throttle is at full power. Link to AMA competition rules: http://www.modelaircraft.org/files/2...erobatics1.pdf "Don't get caught up in the db threshold difference between MARC at 90db & AMA at 96db." As I understand it the 90db target was chosen to be consistent with traffic noise on 520. This will be a difficult to change without getting all legal-beagle sighting King County Park Ordnance precedence and this is not advisable because of the relationship fall out that would incur with MARC board members. Focus on recommending the missing testing stand component which should allow some two blade props to pass with cans at true 90db |
|
|
|
||
|
|
Quote:
Test both methods with a one plane consant, Test 1 -No db meter test stand (hand held meter test) & Test 2- With db meter test stand (stand held meter test) & Then validate the db delta between the two tests. If there is no difference you may have an out of calibration issue. Which leads to another battery of discovery questions, when was the last time the meter was calibrated? & What is the protocal regarding how often the meter should be calibrated? We can all recall that FPV's were going bye bye until facts, data & logic were presented to sway the MARC board to a FPV supportive stance. The db test protocol is no different. It is easy for me to be an arm chair board member, it is way harder to actually be one. Thank you for representing all of us. You have my full support. |
|
|
|
|
|
|
I've mentioned it before, MARC needs a few more new board members before I will support them.
I appreciate the effort Steve and Joe have made as well, but reality is they are just fitting in, not shaking anything up and can't until they have some support. Board meetings are unannounced. That is your first clue the board does not want you to know what's going on. Jack even said he had to welcome members to the board meetings, but he didn't like to, if for no other reason than they do not have room for it. Minutes from December have not been posted, with no explanation. My primary flying is FPV, yet I still have no idea what's going on with FPV at MARC. I even did make a board meeting to try and find out. What I saw as a proposal from 'the FPV committe' I had no idea who/what was, full of inaccuracies and deception. I really felt uncomfortable trading one bad process for a worse one. The boards Method of Operation has not changed one bit since the elections.. I really disliked how the survey was extended. The reasoning was that only 25% expressed an opinion. Well guess what, only 25% voted for directors as well (so I heard, no way to know), I think I see a pattern. My guess is that someone did not like the outcome, so they extended it long enough to sway it. Suddenly 10% more participated? The thing is we will never know. What were the changes suggested by 25% versus the 35% Any difference? And BTW, what were the results, un-edited? BTW I would much prefer my email address be public than my telephone number, and I wish the board would publish their emails so I could express my thoughts. So far, only Joe's email is published. I heard at the board meeting I did go to that there had not been a noise complaint in 2 years. The sound topic is in the minutes (November), but not that piece of information. Either their process works, or the complainer(s) moved. The only way to know is to bump the noise up and see if a complaint happens again. It's a secretive board, and still a control freak. 2 more 3D and/or FPV board members, and keep the 2 we have, then we can make some changes. |
|
|
|
|
|
|
|
We can run test with the DB meter
I can bring a trypod and set it up for you at 2' level back up . (run test) and hold it at knee level run test to see if there is a deference. What is the protocal regarding how often the meter should be calibrated? The DB meter the club bought was expensive it has a calibrater we tested with last night . It stays with the meter. Last year when testing airplanes with Bill Newman the reading were the same with or without a tripod on grass. |
|
|
|
|
|
|
|
I think you are wrong Mike about FPV we spent 1/2 the meeting trying to get the letter right that we will be sending off to King County. We feel that we got one shot and want to get it right. I still have a headache from the meeting. Ian is doing the best he can and has BM support for the follow up letter.
The BS with Seattle PD FPV surveillance project shot down last week is not helping at all. You are welcome to come to the BOD meeting . They are the 2nd Wed of the month. Also Alan McSwain will be giving a presentation on FPV at the next general meeting next thur 2-21-13 bring your set up for show and tell. |
|
|
||
|
|
Quote:
There should be mfg website or phone for the meter & for that matter there should be full instructions on the recommended frequency of calibration, maintence, care & storage of the meter. I am no db sound meter expert however generally for any calibrated measuring device to be certified & truely accurate, it needs to go to a lab with certification authority. I don't dare dig any deeper into this issue. Ahzar you were right again... this will quickly turn into a big-old-can-o-worms. lol Steve again I appreciate you noble efforts & representation. |
|
|
|
||||||
|
|
Quote:
![]() Quote:
Quote:
Quote:
![]() Quote:
and life's always better when you're laughing
|
|||||
|
||||||
|
|
|
|
|
Ok, to lighten up the discussion a wee bit..
watch and laugh and slap your forehead. http://www.liveleak.com/view?i=6e5_1360811236 |
|
|
|
|
|||
|
|
Be a Super Hornet Pilot for a few minutes Super Cool
![]() Full Link Path<http://www.youtube.com/watch?v=nw0gjw1XIIk>
|
||
|
|||
|
| Thread Tools | |
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| For Sale 3DHS Aspera - p/u only, Seattle or Portland | Earthbound | Aircraft - Electric - Airplanes (FS/W) | 1 | Feb 26, 2009 07:16 PM |
| Cool seattle area pilots | b36roxs | Slope | 0 | Jul 26, 2008 12:32 PM |
| Free A Few Wood Built-up 3D Planes in the Seattle Area | xwingnut | Free Items | 4 | Jan 07, 2008 07:12 PM |
| Sold Parkzone Typhoon 3D (Seattle area only) price reduced to $100 | corsha99 | Aircraft - Electric - Airplanes (FS/W) | 3 | Feb 04, 2007 11:44 AM |
| Seattle Area Pilots, lets fly this weekend | Todd Long | Electric Plane Talk | 9 | Sep 08, 2001 03:40 AM |