Running a glow engine without a muffler
10-25-2014 | 05:57 AM
#26
It's been a while, 1QwkSport2.5r. We've finally formed up a motorcycle chapter, which I have been busy with,
http://cmaswr2.org/NM/BLACKWATERDRAWGOSPELRIDERS
Yes, I've heard a lot of good running diesels, they are more economical due to the efficiency of the cycle for small motors and because of and lack of nitro that they don't have as loud a pop. Where I am at currently, we fly in a city park outside city limits where the only neighbour is a farm house a quarter mile away, which now vacant. Noise concerns are very few for the moment, and as long as the other modellers don't object one is good to go. Some fly the big stuff, and so they are used to being a little noisy. Due to construction of high voltage transmission lines bordering the property, the city will move us to the other side of the park. In that case, if closer to picnickers, we then may require mufflers for the larger stuff. Except for CL and small RC stuff, we've been using mufflers anyway.
http://cmaswr2.org/NM/BLACKWATERDRAWGOSPELRIDERS
Yes, I've heard a lot of good running diesels, they are more economical due to the efficiency of the cycle for small motors and because of and lack of nitro that they don't have as loud a pop. Where I am at currently, we fly in a city park outside city limits where the only neighbour is a farm house a quarter mile away, which now vacant. Noise concerns are very few for the moment, and as long as the other modellers don't object one is good to go. Some fly the big stuff, and so they are used to being a little noisy. Due to construction of high voltage transmission lines bordering the property, the city will move us to the other side of the park. In that case, if closer to picnickers, we then may require mufflers for the larger stuff. Except for CL and small RC stuff, we've been using mufflers anyway.
10-25-2014 | 06:35 AM
#27
It's been a while, 1QwkSport2.5r. We've finally formed up a motorcycle chapter, which I have been busy with,
http://cmaswr2.org/NM/BLACKWATERDRAWGOSPELRIDERS
Yes, I've heard a lot of good running diesels, they are more economical due to the efficiency of the cycle for small motors and because of and lack of nitro that they don't have as loud a pop. Where I am at currently, we fly in a city park outside city limits where the only neighbour is a farm house a quarter mile away, which now vacant. Noise concerns are very few for the moment, and as long as the other modellers don't object one is good to go. Some fly the big stuff, and so they are used to being a little noisy. Due to construction of high voltage transmission lines bordering the property, the city will move us to the other side of the park. In that case, if closer to picnickers, we then may require mufflers for the larger stuff. Except for CL and small RC stuff, we've been using mufflers anyway.
http://cmaswr2.org/NM/BLACKWATERDRAWGOSPELRIDERS
Yes, I've heard a lot of good running diesels, they are more economical due to the efficiency of the cycle for small motors and because of and lack of nitro that they don't have as loud a pop. Where I am at currently, we fly in a city park outside city limits where the only neighbour is a farm house a quarter mile away, which now vacant. Noise concerns are very few for the moment, and as long as the other modellers don't object one is good to go. Some fly the big stuff, and so they are used to being a little noisy. Due to construction of high voltage transmission lines bordering the property, the city will move us to the other side of the park. In that case, if closer to picnickers, we then may require mufflers for the larger stuff. Except for CL and small RC stuff, we've been using mufflers anyway.
The only downside to diesel is the smell. It sticks with you for a long time. My buddy and I just call it 'stink'. I think it has more BTUs than glow fuel so it should make more power than glow fuel albeit generally at a lower rpm. I'm still new to the diesel thing. My buddy and I are going to be making a new piston for my Fox .50 diesel due to the Fox piston being too soft (completely wrong alloy/piston). We might convert it to a ringless meehanite piston instead of ringed aluminum. That should run on diesel way better with an iron piston anyway.
11-02-2014 | 07:33 PM
#28
Member
There is a performance edge when you find the correct muffler. I guess the best current example is the Evolution 60NX. I have found several thousand RPM by finding the right combination- and it is not the stock one offered. One good thing for the original poster is that the OS45fsr shares muffler dimensions with the HP 40, MVVS 40-49, Fox 40-45, plus the original OS 40-45 clones ( ASP, Royal, Magnum Pro). I'm sure there are others that could work for him, but I have personally tried all of those listed. Some of the older engines used a baffle connected to the carb linkage and no muffler that throttled extremely well, but they were loud. Most of the modelers that spent a lot of time around them lost their "ear" for tuning in the later years of their hobby.
12-02-2014 | 12:22 PM
#30
They are very loud but will run.
There was exhaust valve systems connected to the carb as well.
I tested an OS10 with this "exhaust system" a few weeks ago.
https://www.youtube.com/watch?v=YFaUDcQwHS0
There was exhaust valve systems connected to the carb as well.
I tested an OS10 with this "exhaust system" a few weeks ago.
https://www.youtube.com/watch?v=YFaUDcQwHS0
