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Everything Radial Engines

Old 09-29-2010, 06:50 PM
  #2526  
S.L.engines
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Default RE: Everything Radial Engines


ORIGINAL: Cybertom

Luigi,

You HAVE to make a video of the SL 150 running WITH the EXHAUSE RING. In my experince the ring makes the engine run smoother and the sound is deeper especially at idle. I have got to hear it!

Here are the videos for you of 'SL150 mounted on flight BU133

Hello



http://www.youtube.com/watch?v=0baW8h6Bwxg

http://www.youtube.com/watch?v=ghku7vlhe8k
Old 09-29-2010, 07:19 PM
  #2527  
retransit
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Default RE: Everything Radial Engines

Hey Tom,

I have a question concerning the ASP 4.00.

I did some initial break-in today using Wildcat 2&4-stroke fuel with castor added (95% syn./5% castor) to the fuel.

I was forewarned by your first video about the valve clearances and I reset all of them first. I found a few valves with excess clearance. Oh, I also checked the interior of the crankcase for crud and none was found, just some lubricant. I primed it and pulled the prop through a couple of revolutions. It started instantaneously.

I ran 32 ounces through it. I could not get the high speed needle to fatten up. I actually backed the son-of-a-gun all the way out for a second and it continued to run.

My question is this. Could it be that the fuel tubing being used (standard 3/32" I.D.) on my test stand is insufficient to draw its needed flow from the tank to richen the mixture? I have the tank in my Fleet plumbed with large (1/8" I.D.) tubing and fuel line.

Anyway, the numbers for an 18-10 Master Airscrew are 1,850 and 8,560 rpm without auxilary glow and leaning of the high speed needle to about three and a half turns out.

Bob
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Old 09-29-2010, 07:25 PM
  #2528  
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Default RE: Everything Radial Engines

Bob, you may need to adjust the LSN in order to affect the HSN. I also believe this engine would be very happy with large fuel tubing. However, you are already getting more RPM than my engine has ever run before! The highest I have ever recorded was 7800 IIRC. Maybe 7900, I would have to go through my notes. But typically mine runs in the mid 7000 range. I do run a different prop, fuel, and glow plugs.
Old 09-29-2010, 07:31 PM
  #2529  
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Default RE: Everything Radial Engines

Here are the videos for you of 'SL150 mounted on flight BU133

When a radial engine airplane is being filmed, there should be NO MUSIC playing over the sound of the engine!! [:@]
Old 09-29-2010, 07:33 PM
  #2530  
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Default RE: Everything Radial Engines

Tom,

I'd hate to adjust the LS needle since it has an excellent transition without any hesitation at all. I'm using Fox Miracle plugs. The prop is a paint stick (Classic).

Bob
Old 09-29-2010, 08:02 PM
  #2531  
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Default RE: Everything Radial Engines

S.L.engines,

I am really impressed! Your radial runs much smoother and has the best transition of any GAS radial I have ever heard. Early next year I will be purchasing a black SL150 radial engine from you. Congratulations on and excellent engineering accomplishment. Not only is it the most scale appearing GAS radial I have seen but it runs the best!
Old 09-29-2010, 09:16 PM
  #2532  
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Default RE: Everything Radial Engines

UMS Seidel dropped their posted pricing on the 7-35 below $1200, so I started looking at the specs in earnest. They state a maximum rpm of 5200, and suggest props like 16x8, 18x6, 18x8, and 20x5. A few calculations with ThrustHP has me wondering how this engine could fly your average 120-size airframe. Optimistically assuming the 18x8 would turn at 5200 rpm, the 3 lb engine would develop 8 lb thrust and fly an aircraft at 40 mph. We euphemistically call that "scale" power in my club.

Am I missing something here? I recall an ST735 mounted in a SIG Waco SRE (70" span) - will the engine fly such an airframe? Can someone suggest the sort of airframe that is suitable?

Thanks so much,
RB8
Old 09-30-2010, 06:04 AM
  #2533  
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Default RE: Everything Radial Engines

Bob, What is your oil concentration in your fuel? If it is high you are automatically leaning the mixture! Try 16% oil in your fuel. My saito's and Seidels would not richen either untill the oil content was dropped to the recommended levels. Normal 20% oil fuel would not allow a rich run! And yes the other Tom might be correct also with the low needle in too far.-The other Tom
Old 09-30-2010, 06:27 AM
  #2534  
fredo
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Default RE: Everything Radial Engines

Luigi, I'm not sure if you are around but I sent you an email
Old 09-30-2010, 07:20 AM
  #2535  
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Default RE: Everything Radial Engines

Redball, I fly a Sig Waco SRE with a technopower 7cyl 2cu. 33cc, It turns a Graupner 16x8 6900, this equates to 8.83 lbs thrust on the thrust program. she flys very well after take off at half throttle. 5200 does sound alittle anemic for a 16", I would think/hope 5200 relates to the 20" end, at 5200 the 20" equates to 12.24 lbs. of thrust.. The 16x8 is the largest recommended prop for the TP so I would guess the Seidel has more torque at lower rpms and can turn a larger prop, which is what some modelers are looking for as far as scale appearance and functionallity.
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Old 09-30-2010, 08:27 AM
  #2536  
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Default RE: Everything Radial Engines

Maxam,
The total oil content of my mix is 18.7% with 14.9% nitro. I doubt if .7% over the original mix will make that much of a difference. That's less than an ounce for a gallon of fuel.

The manufacturer recommends a minimum of 18%, and that is what I use in all my 4-strokes with good results. I'm going to use my Fleet's tank for a run today, which is plumbed with 1/8" I.D. tubing. I'll see if that allows a leaner run. If not, I'll go with Kmot's recommendation and tweak the LS needle first before I reduce the oil content.

Bob
Old 09-30-2010, 08:36 AM
  #2537  
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Default RE: Everything Radial Engines

Hi Maxam,while on the subject of glow fuel mixes,I was wondering about a problem Iam having with a non radial, an0S120AX.I have 2 of these,one 3years old and one new.Both run exceptionally hot on a 20%oil(Klotz) 10% nitro,70% methanol.I have also tried 20% castor but they still run very hot .The older one has blown head gaskets,broken head bolts and continualy loosens them.I have built 3 different cowls for this aircraft(Phoenix Harrier ARF),in an an attempt to get maximum cooling.Is it possible that the oil content is too high for this engine,causing it to run lean.I kept the oil at 20% thinking that it would run eaven hotter if I lowered it. Anybody have anysimilar problems,Mark. PS : The prop is a 16/6 or 17/6.
Old 09-30-2010, 08:37 AM
  #2538  
Maxam
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Default RE: Everything Radial Engines

Bob, You are totally correct. That small difference would have a neglical effect. -Tom
Southerex, If you can richen your needle to make the engine slow down then I doubt it. That is an apprpriate % for those engines. -Tom
Old 09-30-2010, 09:21 AM
  #2539  
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Default RE: Everything Radial Engines

Southernx,

Have you installed baffles in the cowl to direct the cooling flow? Your air exits should be much larger (I think about 3-4 times as large) as your intake area. 18% total oil is fine with some castor to guard against a lean run. You don't want to cook the castor.

Bob
Old 09-30-2010, 02:55 PM
  #2540  
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Default RE: Everything Radial Engines

Well,
I just found the answer to my own question re fuel / oil mix for gas radials.

On Luigi's SLEngines site, SL150: Unleaded 95-98 Premium with 2% (50:1) Synthetic Oil. Compression Ratio 13:1. No wonder it needs Premium Gas !!!

How about the Moki radials? Are they the same as the SL150?

ALSO: Whatever happened to the NEW SAITO FA200R3 engine that seems to have disappeared ??

Regards RossG
radial1951


ORIGINAL: radial1951

Could someone tell me if the Moki, SL and Seidel gassers run straight petrol(gas, benzine) or do they they add a small % of oil for lubricating the internals. I think one of them has a seal between the crankcase and the cam drive housing which has its own oil reservoir. Not sure...

Regards RossG
radial1951
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Old 09-30-2010, 03:08 PM
  #2541  
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Default RE: Everything Radial Engines


ORIGINAL: radial1951


ALSO: Whatever happened to the NEW SAITO FA200R3 engine that seems to have disappeared ??

Regards RossG
radial1951

Guess what?

http://www.horizonhobby.com/Products...odID=SAIE200R3
Old 09-30-2010, 03:26 PM
  #2542  
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Default RE: Everything Radial Engines


Thanks Tom

I could only find it in Sweden and Japan. It's the FA-200R3. That "-" makes all the difference ! Nice looking engine...

Regards RossG
radial1951


ORIGINAL: Kmot


ORIGINAL: radial1951


ALSO: Whatever happened to the NEW SAITO FA200R3 engine that seems to have disappeared ??

Regards RossG
radial1951

Guess what?

http://www.horizonhobby.com/Products...odID=SAIE200R3
Old 09-30-2010, 04:22 PM
  #2543  
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Default RE: Everything Radial Engines


ORIGINAL: Warbird Man

Anyone have one of these yet?

New OS FR7 420 Looks like one sweet 'lil engine

Very interested in its performance.

I certainly would like to have this radial, but at this price I will wait until it has been out for awhile and see if I can get it at a price that will not strangle me. I recently bought a beautiful new saito 450R3 and it took awile to pony up for that.

the OS is 70cc so I would imagine it will be slightly less powerful than the 75cc saito 450.
Old 09-30-2010, 05:09 PM
  #2544  
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Default RE: Everything Radial Engines

I have just a little 300, but sure turns that 22-6 nicely.

L.
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Old 09-30-2010, 05:58 PM
  #2545  
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Default RE: Everything Radial Engines

Hi retransit, yes I have fitted baffling and a cowl flap to try to keep it cool,now that the idea of lowering the oil content has been planted in my head,I will try this with a little castor added, the new engine is to go into a Seagul Gee Bee 120,and I want to iron out as many heating problems with the older engine as I can,eaven though the Gee Bee cowl is much larger and open, thanks for your reply,Mark.
Old 09-30-2010, 07:51 PM
  #2546  
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Default RE: Everything Radial Engines

Let us know how you make out.

Bob
Old 09-30-2010, 08:24 PM
  #2547  
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Default RE: Everything Radial Engines

Luigi, I replied to your PM here on RCU. I'm not sure if your email works. You gave me your new home email but that's exactly same as the one I have already saved.
Old 09-30-2010, 08:32 PM
  #2548  
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Default RE: Everything Radial Engines

Has anyone here on RCUtaken delivery of the SL150. Any thoughts, reviews, pictures or videos to share? Any first impressions of the product. Hope someone could post something. Then engine looks fantastic judging from the videos SLEngines posted.

Old 09-30-2010, 09:57 PM
  #2549  
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Default RE: Everything Radial Engines

Cherokee Flyer: Is that a Fairchild 22? I have been looking at them lately, and thinking it would make a good plane for an exposed radial. Yours looks awesome. Did you build it from scratch?
Old 10-01-2010, 12:40 AM
  #2550  
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yes, it was built from scratch, will let you know how it flies after this weekend. 98" (1/4 scale). Two quarts of good old dope. Here is another picture.

L.
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