New guy here with a few questions

Gordinir8 wrote:So guys i am new to this forum although i know this page for quiet a long, just want to say hi to everybody here and ask a few things. I want to know if the throttle sleeve that limits the revs of the engine is actually bad for the engine or is it ok to use it. Same applies for muffler that i am thinking to put alternative in order to limit somehow the oil spread, i have one of those new build mufflers that are available today. Also my black widow is missing the little intake filter screen, is this a problem besides that something can be sucked in or it might affect performance like excessive fuel consumption. I think that my engine operate for less than two minutes but i haven't fully test it yet. I am about to fly my new build Qtee and that will be my first time that i will fly a cox powered rc plane besides CL i used to fly when i was younger. First flights will be without throttle control but i would like to try one later.

Gordinir8: First welcome to the CoxEngineForum.  

1. The throttle sleeve when closed will affect the engine exhaust, so logically it should affect the engine performance, but how much? some people think it affects performance a lot and some think a little. I think it depends more on your entire engine setup than anything. with the throttle wide open, some throttles have a round hole, still limiting the exhaust, while some have a large slot equal to the exhaust port, so the effect is small. If there is also a muffler, there is a throttle-muffler speed control, then the effect will be more due to the limiting of the exhaust gases, to quiet the noise.
  With the throttle partially open the effect will be limited by the size of the throttle slot or hole and the amount of throttle. Some users say that there are issues with maintaining low speeds consistently. I used a muffler on a babe bee years ago because of noise restrictions and had no issues with RC loops and axial roles. the planes demise was when I tried to do some kind of figure 8 where you have to come out of a roll inverted and i planted the plane in the dirt. the engine was o.k., but the plane took a while to repair.
2. Mufflers - the amount of goo coming out of the muffler depends on the muffler. In the old days there was a car muffler cast as one piece, with a long neck, directing smoke and goo away from the car, not adjustable. It is very hard to get, but available thru our favorite vendors sometimes, (ref. Matt at  exmodelengines.com and Bernie at coxengines.ca). Another was a 3 piece similar to the long neck version, but shorter and spring type adjuster on the size of the exhaust port. The current  model is similar to the older model, but does not have the nose, to direct the gasses away and has a small hole instead of a large exhaust area.
3. the filter on the intake of the fuel tank, Black Widow can be purchased from the previously mentioned vendors. the one purchased may be slightly larger, but it can be trimmed. the forum is like google. search in the search box what you need to know, like "how do i put screen over fuel intake on Black widow" and you most likely you will get a post or posts that will describe or show a video how to do it.
4. 2 minutes run time - try searching that subject. or look at the location of the pickup tube. It could be placed too high in the tank and not empty the tank, or look at the tubing in the fuel pick up area for clogs or debris.

I hope I answered your questions.

ask questions and someone will answer them, eventually.

happydad   i love to fly, i am old, USA