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
|
|||
|
|||
Real time continuous Prop balancing
"abripl" wrote in message
oups.com... I'll give them an 8.5 on the bull**** scale... Thank you for your technical help. I assume you have tried them yourself and are giving an objective observation. Try them? You've got to be kidding. To quote the web pages: "However, when sudden braking or slowing occurs, the fluids continue to spin for several revolutions until they slow down to the wheel speed. Therefore, the fluid moving at high speed and weighing nearly 28 ounces per wheel whip around the ring at ten to fifteen revolutions per second. This weight, when pulled by gravity over the top of the wheel, "falls" over the front side of the wheel where the force is created which "pulls" the wheel down onto the pavement-JUST WHEN YOU NEED IT TO-on sudden braking over hard bumps or across sheets of water to create a road-hugging controlability and anti-sway, anti-drift and anti-trailer hop and bounce effect" RiiiiIIIiiight. Or, from the other web page: "The Company claims the dissimilar metallic composition of the balancer, i.e. steel mounting plate and aluminum balancing ring, dissipates wheel/tire heating while in operation. This feature is called "ThermoFlow" by the Company. Basic rules of thermal physics apply as different metals have different coefficients of contraction/expansion with convection heat transfer migrating to the metallic content with the highest coefficient of expansion/contraction, i.e. rapid transfer from the wheel/hub/tire assembly to the steel mounting plate to the aluminum tube." You don't have to pay for bull**** to smell bull****. 8.5 - you can't get a 10.0 without invoking space aliens AND anti-gravity. -- Geoff the sea hawk at wow way d0t com remove spaces and make the obvious substitutions to reply by mail Spell checking is left as an excercise for the reader. |
#12
|
|||
|
|||
Real time continuous Prop balancing
I think the down force is the result of gyroscopic precession which is 90 °
for the applied force. Balance rings are not new. Mark Landrol sells one for RVs with wooden prop that many are happy about. "Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t com wrote in message ... "abripl" wrote in message oups.com... I'll give them an 8.5 on the bull**** scale... Thank you for your technical help. I assume you have tried them yourself and are giving an objective observation. Try them? You've got to be kidding. To quote the web pages: "However, when sudden braking or slowing occurs, the fluids continue to spin for several revolutions until they slow down to the wheel speed. Therefore, the fluid moving at high speed and weighing nearly 28 ounces per wheel whip around the ring at ten to fifteen revolutions per second. This weight, when pulled by gravity over the top of the wheel, "falls" over the front side of the wheel where the force is created which "pulls" the wheel down onto the pavement-JUST WHEN YOU NEED IT TO-on sudden braking over hard bumps or across sheets of water to create a road-hugging controlability and anti-sway, anti-drift and anti-trailer hop and bounce effect" RiiiiIIIiiight. Or, from the other web page: "The Company claims the dissimilar metallic composition of the balancer, i.e. steel mounting plate and aluminum balancing ring, dissipates wheel/tire heating while in operation. This feature is called "ThermoFlow" by the Company. Basic rules of thermal physics apply as different metals have different coefficients of contraction/expansion with convection heat transfer migrating to the metallic content with the highest coefficient of expansion/contraction, i.e. rapid transfer from the wheel/hub/tire assembly to the steel mounting plate to the aluminum tube." You don't have to pay for bull**** to smell bull****. 8.5 - you can't get a 10.0 without invoking space aliens AND anti-gravity. -- Geoff the sea hawk at wow way d0t com remove spaces and make the obvious substitutions to reply by mail Spell checking is left as an excercise for the reader. |
#13
|
|||
|
|||
Real time continuous Prop balancing
RiiiiIIIiiight.
You don't have to pay for bull**** to smell bull****. 8.5 - you can't get a 10.0 without invoking space aliens AND anti-gravity. I just love all your scientific savy. |
#14
|
|||
|
|||
Real time continuous Prop balancing
I've wondered about these. By both brands, there is a mass of weights and
fluids that counteract the shake of imbalance. I never made it past Phy101 but how I see the problem is that a heavy spot of imbalance provokes a rotating object to a larger orbit. The instance of a car tire bouncing I have witnessed myself, but the low side was always constrained by the pavement. So, what causes the correction mass to seek the lighter low side? And what happens under the influence of an engines torsion vibration? The quick back & forth of the crank's twist, the wind and unwinding, Is the mass be heavy enough to lag behind the twist of how many.... 8 or 12 twists per revolution?? My guess about the rings on Rv's with the wooden props is its simply a matter having enough mass on the crank to absorb the torsion of the engine. Somethig heavy enough to steady down the running of the engine...Somewhat similar to running a chevy small block minus a flywheel, on the shop floor!. And a big question of all... why don't we commonly see more of these mechanisms on vehicles? Kent Felkins Tulsa "Cy Galley" wrote in message news:7Jjxf.698432$_o.515003@attbi_s71... I think the down force is the result of gyroscopic precession which is 90 ° for the applied force. Balance rings are not new. Mark Landrol sells one for RVs with wooden prop that many are happy about. "Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t com wrote in message ... "abripl" wrote in message oups.com... I'll give them an 8.5 on the bull**** scale... Thank you for your technical help. I assume you have tried them yourself and are giving an objective observation. Try them? You've got to be kidding. To quote the web pages: "However, when sudden braking or slowing occurs, the fluids continue to spin for several revolutions until they slow down to the wheel speed. Therefore, the fluid moving at high speed and weighing nearly 28 ounces per wheel whip around the ring at ten to fifteen revolutions per second. This weight, when pulled by gravity over the top of the wheel, "falls" over the front side of the wheel where the force is created which "pulls" the wheel down onto the pavement-JUST WHEN YOU NEED IT TO-on sudden braking over hard bumps or across sheets of water to create a road-hugging controlability and anti-sway, anti-drift and anti-trailer hop and bounce effect" RiiiiIIIiiight. Or, from the other web page: "The Company claims the dissimilar metallic composition of the balancer, i.e. steel mounting plate and aluminum balancing ring, dissipates wheel/tire heating while in operation. This feature is called "ThermoFlow" by the Company. Basic rules of thermal physics apply as different metals have different coefficients of contraction/expansion with convection heat transfer migrating to the metallic content with the highest coefficient of expansion/contraction, i.e. rapid transfer from the wheel/hub/tire assembly to the steel mounting plate to the aluminum tube." You don't have to pay for bull**** to smell bull****. 8.5 - you can't get a 10.0 without invoking space aliens AND anti-gravity. -- Geoff the sea hawk at wow way d0t com remove spaces and make the obvious substitutions to reply by mail Spell checking is left as an excercise for the reader. |
#15
|
|||
|
|||
Real time continuous Prop balancing
Fly,
There are more than just those two companies making them - like www.taabs-int.com, www.imiproducts.com and some reference to http://www.tirelife.com/ An article that discusses that is at http://www.landlinemag.com/Archives/...tires_life.htm There are several independent reviews of the devices and all indicate they work. There is an interesting demo machine that Centramatic.com distributies to ilustrate the balancing effect on a demo wheel. A demo video is available at http://www.centramatic.com/Demo/video2.mpg As far as I see it does not violate conservation of angular momentum. A free body in space will always be in angular balance about its CM whereas that is not the same case for rigid bodies rotating about a fixed axis - maybe that is the key: there extra bodies free to move. As to why they are not used more... probably the extra cost is prohibitive, to say an automobile where a $20 tire balance will do. But for big trucks it can pay off. I am not promoting the devices, but just have an open mind. Its so easy to put down others and not be creative oneself. |
#16
|
|||
|
|||
Real time continuous Prop balancing
On 11 Jan 2006 18:22:58 -0800, "abripl"
wrote: I'll give them an 8.5 on the bull**** scale... Thank you for your technical help. I assume you have tried them yourself and are giving an objective observation. I can't say I've tried them all but I have tried a bunch of them. I've been in the tire business for over 40 years. After radial tires became popular but before computer balancers were available we tried everything to give customers a smooth ride. Several of the oil/ball bearing rings, sand, plastic beads, windshield washer fluid. Some truckers even put 3 golf balls in their tires. The thing with all these ring type "balancers" is they are on a single plane. They do nothing for side to side imbalance. We tried them with on-the-car strobe and computer balancers. The only thing that was constant was that the imbalance would move every time you stopped the tire. Spend your money how you please but I won't use them if they are free. |
#17
|
|||
|
|||
Real time continuous Prop balancing
The thing with all these ring type "balancers" is they are on a single
plane. They do nothing for side to side imbalance. ... That is all that is done for props. When you take your prop in for dynamic balance all they do is add weights to the spinner ring - "single plane balancing". |
#18
|
|||
|
|||
Real time continuous Prop balancing
"abripl" wrote: Such a continuous balance device would also take care of imbalance as the prop gets nicks and scratches. It might even help in flight with accidental prop damage. These are some of the good reasons... -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Not to mention this could well be a solution in search of a problem. When it comes to RELIABLE flying... - KISS - K eep I t S imple S toopid. - Barnyard BOb - more than a half century of flight |
#19
|
|||
|
|||
Real time continuous Prop balancing
Hi,
I believe that such balancers are possible. I have seen such a system on a washing machine probably made in the 1960s. Huge initial shake, big clunks, perfect balance. http://www.monografias.com/trabajos1...ensating.shtml Very mathemetical paper but may be a start for a search. A while back I did a bit of googling on such balancers but I forget the results now but seem to recall an application in some reasonably high volume device. Chain saw? |
#20
|
|||
|
|||
Real time continuous Prop balancing
abripl wrote:
This thread is not about how to balance a prop or shop balancing machines. Did anyone use BalanceMasters device bolted on their ultralight prop? These devices apparently balance the prop continuously as you fly. Similar devices are used on truck wheels - see www.BalanceMasters.com and www.centramatic.com ya know, if we consider this to be a wood UL prop (US style), it doesn't weigh more than about 5 ot 6 pounds. If the prop static balances ok, but still vibrates badly enough to cause concern, I think I'd just replace it because it obviously has a problem. A couple of hundred bucks for a new Tennessee Props propeller isn't that bad - specially when the alternative is throwing a prop blade in flight. Just a thought... Richard |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Real Time to build an RV10 | [email protected] | Home Built | 13 | October 31st 05 02:20 AM |
Most reliable homebuilt helicopter? | tom pettit | Home Built | 35 | September 29th 05 02:24 PM |
Nearly had my life terminated today | Michelle P | Piloting | 11 | September 3rd 05 02:37 AM |
Prop balancing and assorted observations - long | Dave Hyde | Home Built | 10 | June 27th 04 01:08 AM |
IVO props... comments.. | Dave S | Home Built | 16 | December 6th 03 11:43 PM |