Glow Engines Discuss RC glow engines

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Old 03-23-2019, 04:37 AM
  #39576  
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Originally Posted by Hobbsy View Post
On a typical installation the Turbo Header gives you an extra 200 to 310 rpm and has really cool sound. RC Specialties - RC Mufflers for Four Stroke Engines
I like the look, the sound doesn't really matter much too me. Are they unbaffled? Have you tested the rpm gains against their claims Dave?

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Old 03-23-2019, 04:56 AM
  #39577  
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I don't know that Jim makes any claims beyond them being compact and easy to hide. Folks all over the world have heralded the extra rpm, even Pete I believe. And to answer, yes I have, the only engine that did not respond was my early 125. I haven't tried one on my newer 125-a. They have a deep authoritative throb that a lot of guys like. The latest ones are unbaffled and welded.
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Old 03-23-2019, 05:17 AM
  #39578  
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From the RCS website.

"The TurboHeader Muffler's patented design increases the peak performance of your engine by 200-300 RPM, and that's just the beginning. Its sound attenuation chamber brings out a fantastic tone that is sure to grab the attention of your fellow modelers. (U.S. D593,013)"

I'd love to see a real world test. Same fuel, prop, day etc, sans placebo.

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Old 03-23-2019, 05:38 AM
  #39579  
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And the placebo would be what? I'm curious.
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Old 03-23-2019, 05:50 AM
  #39580  
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Originally Posted by Hobbsy View Post
And the placebo would be what? I'm curious.
The placebo? If it's louder it's gotta be faster.

No offense Dave but there's just not that much info on real world testing of the Turboheader Muffler, or I'm just having trouble finding it. I've only found a few testimonies to performance increase and no details about the testing so far. At $65+ I wouldn't buy a muffler because it looks or sounds better. I was hoping someone here had tested one, preferably a later model without baffle.

Sounds like you have an opportunity to do a head to head comparison on your fa50. I'm looking forward to hearing about that.

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Old 03-23-2019, 07:07 AM
  #39581  
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The baffles were eliminated a long time ago, for example early on a 65 would get a baffle an 80 and 91 would not.
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Old 03-23-2019, 08:02 AM
  #39582  
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Originally Posted by Glowgeek View Post
That's a dandy. Thrust calculator says an APC 12x6 @ 9390 rpm @32f is making 5.67 lbs. of thrust and .741 HP. There's a whole bunch of 40 size models that engine would pull.

David Geirke came up with .71 hp but cheated with a correction factor of 1.04, the honest hp was .68, he should have stuck with that. Corrected doesn't fly your airplane.
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Old 03-23-2019, 08:16 AM
  #39583  
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Turbo header is based off automotive exhaust performance systems. They just figured out how to put it into a small muffler to obtain a small gain by using the exhaust pulses to get more power. I don't know exactly how it works, but my theory is that the flow of air over the muffler, and the way it is shaped inside and out pulls the exhaust out allowing the motor to breath better, gaining a few hundred RPM. A freer flowing exhaust always helps gain some power. The trick is to not overdo it and lose all back pressure that an open pipe system does.

A muffler works on allowing the gasses to expand, and get redirected with baffles, slowing down the flow, so that when it exits the tail pipe the gas is flowing smoothly, removing the pulses from combustion. An unbaffled muffler allows the gases to expand, but without restrictions the gasses are freer flowing, reducing back pressure but not eliminating it completely, while eliminating the pulses, and this is what I think the TH muffler does.
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Old 03-23-2019, 08:39 AM
  #39584  
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Originally Posted by Hobbsy View Post
David Geirke came up with .71 hp but cheated with a correction factor of 1.04, the honest hp was .68, he should have stuck with that.
My calc shows .699 hp with 1.0 CF, .727 hp with 1.04 CF. My calc actually has a CF of 1.06 for apc props.



Originally Posted by Hobbsy View Post
​​​​​​Corrected doesn't fly your airplane.
Oh no! I'll not be suckered down that rat hole. Lol
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Old 03-23-2019, 01:15 PM
  #39585  
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Originally Posted by Glowgeek View Post
My calc shows .699 hp with 1.0 CF, .727 hp with 1.04 CF. My calc actually has a CF of 1.06 for apc props.





Oh no! I'll not be suckered down that rat hole. Lol
I am curious about who determines the correction factor for certain props, it would be interesting to know what goes into it. Thanks
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Old 03-23-2019, 03:45 PM
  #39586  
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Did we lose a post?
The one where Dave mentioned Industrial Electronics Schooling?

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Old 03-24-2019, 12:06 AM
  #39587  
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Watchew talkin bout willis?

Glowy the turbo headers are well made,sound better and are much lighter than the stock muffler assy,all pluses for me.Jim sent me two,one for the fa82 which was baffled and one for the fa220 which was not,beautiful looking piece of work.I had an extra 330 with the fa82 in it and turbo header but they are both dead now after a vertical dive into a tarmac airstrip at full throttle.

I'm keen to see how these prop calculators work as others refer to them also.Just kidding but is there any snake oil salesman involved?
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Old 03-24-2019, 03:26 AM
  #39588  
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Side by Side


Yep, the stock 2.20 muffler weighs twice as much as the TH.
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Old 03-24-2019, 04:03 AM
  #39589  
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Thanks Dave, less weight is a winner. Now "Show me the money"! Lol

I don't expect the little fa50 to see a 300 rpm gain using the TH muffler, probably not even 200 rpm, but I am curious to see what the gain is. Probably too cold to be out testing engines where you're at but I'm a patient man.
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Old 03-24-2019, 04:23 AM
  #39590  
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Duty called me to split about 500 pounds of firewood yesterday, I was down to 12 pieces. Church ties up this AM, maybe when I get home about 1:00 PM. I have an old gray Graupner 12 x 6, a Xoar 12 x 6, an APC 12 x 6 and the tank is full. The new tach seems to be dead on. It shows 3,600 under the lights. The FA 40-a showed a 110 rpm increase with the TH and the Gary made elbow adapter. The FA 40-a has a "big" sound when wearing the TH.
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Old 03-24-2019, 04:29 AM
  #39591  
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Very light anti-reversion pipe for Saito 56


Saito 220 with anti reversion pipe


Saito 180 with homebrew lightweight pipe
4 years ago a local club member picked up a Saito 220 with a stripped exhaust thread. He needed a repair and wanted a simple straight pipe. I repaired the head and made him an anti reversion coaxial pipe. Weighed a lot less and it too picked up 300 RPM. The sound was the best part.

Another homebrew system that weighed about half and sounds good was the system for the WACO.

The aluminum anti reversion pipe was used on my old Sr Kadet for a long time. . Picked up maybe 150 RPM. I was looking for a different sound and less weight in most cases. Any power gain was just incidental.

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Old 03-24-2019, 05:00 AM
  #39592  
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Your pipes look MUCH better to me than the saito cast mufflers or the machined aluminum chunks from RCS. Very sleek looking, light weight and rpm gains, win win win. The brass one on that 150 is just awesome!

So I'm wondering about header length, specifically for peaking rpm with a given prop. Maybe using a two piece header pipe/muffler combo that slides in/out to increase/decrease header pipe length? Lengthen to increase lower end torque, shorter for higher rpm gain. Not say'n it would fix the fa82's problem with running a 14x6 above 9200 rpm but it may be worth a try?

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Old 03-24-2019, 08:08 AM
  #39593  
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Gary, just for fun I ran the muffler you sent for my 62 on my 82. Identical rpm to the stock 82 muffler using a 14x6 prop (9200). Interestingly, the sound was almost identical as well.
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Old 03-24-2019, 12:12 PM
  #39594  
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Can someone give me the dimensions for the 180/FG-30? I want to compare them to the NGH 38CC I have. I think the NGH may be a bit too large for the plane.
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Old 03-24-2019, 12:14 PM
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Geekster

That is the stock muffler from an early 65. I really like those mufflers. That adapter for the 62 is from a 170 radial. I made a few before realizing Saito already made them.

Betting you will like the SWAK too!

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Old 03-24-2019, 12:20 PM
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Here is a handy torque chart. Not universal nor definitive but good ballpark starting numbers.
Also a couple pics of my favorite mini torque tools for toy engines


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Old 03-24-2019, 12:30 PM
  #39597  
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25 years old and still good.


Similar chart
I stopped guessing a long time ago, back plate bolts need to be carefully thought out, haven't stripped on yet. Saito rocker covers get 7 inch pounds.
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Old 03-24-2019, 01:08 PM
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The Snap-On recording dial type came around 35 years ago, my favorite, very reliable.

The red clicker is about 10 years old.

Not sure who makes the clickers for Snap-On.
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Old 03-24-2019, 01:56 PM
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Thanks for the torque charts, the tools are cool and the ol 65 muffler has found a happy home on a 62.

UPDATE: Looks like the 62 picked up a solid 100 rpm with the 65 muffler. Extra sweet.





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Old 03-24-2019, 05:08 PM
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Found the manual for the FG-30 and found the engine is just the right size, so I'm all in on the B-25 now. Cowls are on order, and two new FG-30B are on order. The NGH38CC will go on the P-61 instead. It's going to have plenty of power and that sweet saito sound that a Warbird needs.
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