Kinebohのブログ一覧

I was disappointed to know that OS does not supply the part of 7DV carburetor spray bar any longer because of old model. As I have been suffering from stuck feeling at the fuel squeezing construction from new condition. This strange phenomena should be caused by some low manufacturing(poor quality control) by the manufacturer. So, I tried to establish the centrality of spray bar inclination by inserting metal rod inside, applied stress damaged splay bar slit portion by chance and incredible breakage happened along through the slit miserably as a matter of fact, Oh my God! Fuel squeezing mechanism in 7DV carburetor has lost completely, how come? The carburetor should be brought to OS service front asking any countermeasure before I did poor action on it, then they must have done well with it as usual.

This destroyed part had been thrown away for long time because of the reason.
Just I imagined the way to rescue this lonely one by myself imitating the fuel passing ways in YS 60 FR motor, yes, engrave the sharp triangle passing way on the throttle valve and carburetor body inside. Deeper consideration should lead me to do that because have I a good control in front of me. Several precise modifications must be required on the way of machining procedure, but I'll do that once the idea comes in to my mind.
Wanna I fulfill my ambition, it is interesting, don't you think? Of course OS 61 RF rear exhaust port type motor would be operated in combination with YS fuel pressurizing regulator system.
Reporting on this interesting trial attempt would be done later.

As I felt some strange feel at the state just before stop, inspected I front wheels of
Super Beetle by lifting up, then unacceptable rotational resistance was observed in right side wheel, so to speak stuck feeling.
Following the natural countermeasure for this inconvenience, the brake drum was removed, no problem was found out in wheel bearings, inner and outer.
Careful checking on the operative cylinder, the sliding pusher for the trailing side was cohesively stuck. This kind of banish like material might have come from gradual leak of brake fluid or denaturing of silicon grease applied at assembling stage.
Removing all the banish there and reassembling the construction re-obtained the natural function again.
Whenever we start the brake maintenance work, some dust sheet under the wheel must be prepared, otherwise, the pit floor would be spoiled as shown in the picture.
I felt the necessity to check brake construction periodically, the maintenance sheet by the constructors is not always prepared unreasonably.

Though the performance and stability in actual use is already proved by the manufacturer, their regulator system is available or not on another motors by different constructors except Yamada under the natural aspirating carburetor fuel pressurized condition. According to the opinion(probably scientifically proved by actual measurement by the company) The pressure value of the first stage compression in 2 cycle motor crank case is the same no matter how the displacement value might be different, meaning that the first stage pressure value is the same in the smaller motor as 10 cc motor. We might regard it smaller in a smaller motor, but they are the same value, even in L.M. Cox 010 cu inch motor. So, my curiosity to prove the fact if it is possible or not, to apply the system on another motors, it is a simple but long lasting reason why I have been advocating on this point.

The way of experiment
The pressure nipple was set on the front part of crank case for the purpose to pull out the first stage presser that compress the fuel tank to supply pressurized fuel to the carburetor and controlling the fuel amount adequately and supply stable amount according to the motor speed under some changeable burdening condition in the maneuver scenarios. YS regulator is mounted on somewhere nearby the motor independently.

The requirement for operating YS regulator system in steady state
No pressure leak in fuel line and pressure line including one way valve and fuel strainer and regulator such as small grain dust or fiber material from the textile.
Pressure nipple(pressure extracting point and duration) should be properly between 105 degree and 160 degree ATDC. The pressure extraction angle value is very important to obtain the most effective controlling avoiding pressure fluctuation caused by fundamental 2 cycle piston valve construction. The stable pressure supply contributes not only to the tank burdening position, most of the case it is near CG point but also to the linear carburetor action in combination with the diaphragm regulator system. Requirement of the carburetor YS fuel pressure regulator does not have the capability to control the fuel amount at the lowest throttle position. The diaphragm control is not so linearly at the throttle closest position.
Consequently, it should be controlled by carburetor construction by means of fuel squeezing mechanism such as an additional opposing needle or slit closing spray bar designing. Air through controlling screw is not always necessary here. ENYA G-type carburetor is available if the fuel way should be closed utmost following the groove engraved on the throttle valve drum surface.

As a matter for regret, a miserable affair happened.
A precious and expensive articulater, Charles E. Stuart designed fully adjustable Gnathologic device in Dental field disappeared in the museum showing case.
I happened to find out it in the storage place in the condition of being lost of incisal guide pin and separated upper plaster cast.
When I asked where it is to the chief of the stuff, he replied it's somewhere and he would seek it later, however longer I might wait it all day long, the time to close the place, he prepared to come home, and I said to him, then bring it to me tomorrow.
Probably he reluctantly thought, he served the bent and distorted guide pin with apologizing the fault caused by one of the stuff. But, he never declared who did it by name.
Falling down accident was the reason to hide the articulater!
Layman or laywoman cause such kind of mistake sometimes, because the bows upper and lower are separated in Arcon type articulater, not jointed in the hinge portion.
He made up his mind to cover the punishment by a joint and multiple responsibility , it's nothing but a Japanese way of thinking as if he looks a person with warm and gentle mind.
He keep concealing the evidence forever or until it becomes obvious?
On the other hand, I have different way of regarding that I put and emphasis on the point, the importance is how we can countermeasure the accident, repair it or order a new part to the manufacturer.
Hiding or dressing up as if nothing happened are not the correct and fair way to go. Sorrowfulness in his mind let him do so?
I never scowl or punish on any mistake if it had not been done intentionally.
The importance is the countermeasure immediately after the accident!
We should think over about the problem all together, how to do that, it has nothing to do with the punishment applied on a specific person.
I must teach about that with some gentle distraction, a bit difficult, to a different generation boys and girls.
Remembering my past, my Boss in the institute of the Graduated University punished me utmost if it had not been done by myself but by himself, I endured on the sever circumstance, because this kind of hardships would be some energy and power to live myself at that time. And I determined that I would never be the person like him.

A radial mount for ENYA 60 X was fabricated with wooden plate to be burdened on a flying motor testing airplane, Sukhoi 31.
Though the radial mount is set on the bulkhead by way of 4 points rubber insulator, I designed to support with rubber plates in addition for the purpose of avoiding combustion knocking vibration. This kind of mounting method might spoil the true maximum and ultimate performance of the motor, but the effect of prolonging the lives of potentiometers in the servo's construction as well as of all the moving parts in the airplane.
Rubber insulators for the motor mounting take effect for silent flight, vibration and combustion noise including that is produced by propeller's cavitation in the sky and that is similar with combustion noise. Most of the noisy air plane amplify both noises on main wing and fuselage surfaces, in short, they play a part of noise amplifier in the sky. This is why the method to separate the noise causing origin with airplane body at the point of the first bulkhead by means of setting any insulation materials, rubber.
But, remember here, a slight fluctuation on the motor thrust line affects on the flight, most of the pilot might feel some funny reactions to every direction.
Considering the physical property of the viscoelasticity in rubber material, below JIS #70 coefficient is not recommended for the purpose here.

This motor had not been operated as long as 40 years just after once testing operation with Tuned pipe on Curare 60.
As a secret information, the main crank shaft supporting bearing is a very seldom one, the outer lace diameter is 2 mm wider than ordinary #6903, so the engraving on the front case for supporting bearing does not accept #6903 so far as the space here should be fulfilled, a ling spacer must be required if popular one is desired.
This is why ENYA 60 X has not been used as my first line fighter's motor, however deeper I might love the specific character of ENYA 60 X, good performance producing stout construction and Aluminum alloy-Chrome plated cylinder design.