-
https://youtu.be/zirWTkokqDc
-
According to this article, there was a chemical plant explosion in China in March, and the plant produced nitromethane.
https://www.jqknews.com/news/164888-Sound_Water_Explosion_A_Lane_blocked_by_a_hard_roadbed_has_been_lifted_at_least_70_metres.html (https://www.jqknews.com/news/164888-Sound_Water_Explosion_A_Lane_blocked_by_a_hard_roadbed_has_been_lifted_at_least_70_metres.html)
-
Guys,
This is an excellent video with good info. Thanks for doing this!
-
I tend to disagree with Tom in only one regard in this interview.... Nitro Methane is used a LOT in USA industrial applications
Nitromethane is used to stabilize other chemicals and aerosol propellants.
Glow engine use IMO is probably the least amount of consumption, in fact I could probably say surface car Racing is not even in the top 10 of Nitro Consumers.....BET money DuPont, and BASF use a scary amount....( Yes Virginia...like on Breaking Bad, we learn that a train tanker car holds 6300 gallons of all sorts of bad mojo chemicals.....)
Point is the industrial users get first priority for the scarce commodity.... SIG ...I bet...could get all they want....with a higher bid....just a gut belief.......TORCO never ran out...just jacked the price from $52 delivers to $78 delivered.....jest saying.......wish I knew Riche's brew owner personally....bet he KNOWS the true skinny
-
Hello
A little bit of alternate ./ accurate information .
Many 61 size engines Run 13 to 13.5 even 14 inch props with little problems , and many have ran 13 inch 3 blades on PA 61s, The are equivalent of a 15 inch 2 blade , the recommended prop for the DR 61 is a 13.25 2 blade, However some will not ! But not all are limited to 12 12.5 props
K77 is a close as possible copy of the pa 75
Kaz and many others use nitro in the K77, 5% is a good place to start, a 13.5 x 4.5 3 blade is a good starting prop.
Nitro is a very GOOD thing for model engines, and makes the engine easier to needle, easier to crank, and can give the motor a much larger envelope to run in. AS said many engines are setup to run FAI fuel, They can be made to run well, but even pilots that use them will many times add a small amount of nitro to help make the engine more friendly , 1 to 2.5 percent is what I have seen
The pipe description is wrong, for stunt or speed, Most people in RC or CL stunt are using a pipe and are NOT concerned with sub Port induction, that most engines do not have, So NO one now days use a pipe that is tuned to charge thru the crankcase by tuning it to pump a charge under the piston. Typical speed applications have a wide blow down period between exhaust and intake sleeve port, The reason why, is so the can charge the engine thru the exhaust port over the top of the piston, This is done by tuning the pipe to get the pressure wave bounce back from the rear reflective surface ,to arrive just as the intake port shuts, but while the exhaust is still open, This actually acts like a mini supercharger and raises the amount of charge in the cylinder. You can get a huge power increase doing this, You also can run a long pipe and get the pipe to help your cycling in Stunt applications, This is particularly useful in high winds, plus give a small boost uphill and runs off the pipe downhill, slowing it down. It also make for a very quiet setup, and helps keep oil off of the air frame, this results in longer life for models
Randy
-
how it works
(https://www.2strokeengine.net/2strokeenginepics/n-wave_2.gif)
-
how it works
(https://www.2strokeengine.net/2strokeenginepics/n-wave_2.gif)
That is correct, as I stated it charges the top combustion chamber, not the crankcase bottom
Regards
Randy
-
A very interesting video for me because I've never used nitro so have a fair bit of experience with that fuel. However I've always been aware that virtually all engines have compressions suitable for use with nitro so can't take full advantage of just methanol so about 8 years ago I decided to try an experiment using an Enya 60X to see what affect raising compression might have. Standard compression was around 9:1 and on a 12x6 prop peak revs were 11700. Without going into all the details of how I did it but as I gradually increased compression the peak revs began to rise until eventually I got no more increase in revs. At that point the compression was 13.5:1 and peak revs were now 12500 which, using the cube law for power, equated to a 22% rise in HP. This was all done with the same hot glow plug but even better results may have been achieved by going to colder plugs to retard the ignition point which would have allowed even higher compression.
About 4 years ago I bought an Enya 61 RE (the original ringed engine) and after using it for some time in my SV-11 I decided to raise its compression too and see what happened. This version (unlike the later red headed ABC) used a head button so it was quite easy to make a new button. The original compression was 8.75:1 and on the test stand peak revs were 8800 but with the new button (at 13:1) peak revs were now 9500 which meant a 26% increase in HP. Another difference was that originally the 4-2 break ranged between 78-7900 but the new button ranged between 75-8200 revs.
-
That is correct, as I stated it charges the top combustion chamber, not the crankcase bottom
Regards
Randy
I knew what I meant, but you know I am not perfect in stating every point Not that it matters
(https://diagramchartwiki.com/wp-content/uploads/2018/03/two-stroke-engine-diagram-valve-timing-diagram-for-diesel-engine-2-stroke-simple-portrait.jpg)
-
This actually acts like a mini supercharger and raises the amount of charge in the cylinder. You can get a huge power increase doing this, You also can run a long pipe and get the pipe to help your cycling in Stunt applications, This is particularly useful in high winds, plus give a small boost uphill and runs off the pipe downhill, slowing it down.
This last bit is the key takeaway for stunt fliers - it's not just a (very reliable, passive) supercharger, it's an frequency/rpm-dependent supercharger. It supercharges at some RPM, but not at others. At some RPM, is has negative effects, that is, it reduces the power at that RPM. That's how you can use it as a regulator. It's remarkable that many people still don't grasp the subtlety of that effect, and, you don't really need to understand it on that level to make use of it.
Brett
-
I knew what I meant, but you know I am not perfect in stating every point Not that it matters
(https://diagramchartwiki.com/wp-content/uploads/2018/03/two-stroke-engine-diagram-valve-timing-diagram-for-diesel-engine-2-stroke-simple-portrait.jpg)
Hi i just wrote what is actually happening , Many years ago speed flyers used to have engines with sub port induction,.. meaning the piston skirt was short and uncovered at the bottom of the exhaust port, many believed they got a boost from the engine seeming to engulf part of the unburned charge at this area of the exhaust port, it would charge the bottom of the engine crankcase, how effective that was is questionable in most application, but nether the less , pilots used the sub port pistons and liked it .
Regards
Randy
-
Tom's seminar was about fuel not pipes or big mufflers
-
Tom's seminar was about fuel not pipes or big mufflers
Yes I realize that, hence the reason I commented on Props, and Fuel, Although it's correct that some engines like smaller diameter props, I pointed out many will turn large props with ease, and Even though you can run most anything on FAI fuel, Many times, even engines that are designed for FAI fuels, are better with some Nitro, Just ask Orestes !, He add small amounts of nitro in his Discovery retro engines
And The pipes we run are not just large mufflers, "if" ran properly, If not then yes, they can be large mufflers.
Regards
Randy
-
I knew what I meant, but you know I am not perfect in stating every point Not that it matters
(https://diagramchartwiki.com/wp-content/uploads/2018/03/two-stroke-engine-diagram-valve-timing-diagram-for-diesel-engine-2-stroke-simple-portrait.jpg)
You don’t want hot, unused gases under piston. Sub piston induction works (and is limited by rules) in some classes where enginesare used WITHOUT a muffler/tuned exhaust.
The idea is to suck fresh air to bottom end between exhaust pulses. L