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Everything Radial Engines

Old 12-26-2007, 03:58 AM
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Default RE: Everything Radial Engines

Oh, Ed, if You want the original manual, I could scan it and send it to You by email, if You want, and the capacity is 2.488cui.

gnome

Holm und Rippenbruch
Old 01-04-2008, 12:32 PM
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Default RE: Everything Radial Engines

Someone has inherited a Seidel 7 cylinder through unfortunate circumstances and could use some help getting it sorted out:

http://www.rcuniverse.com/forum/m_6847793/tm.htm
Old 01-04-2008, 09:20 PM
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Default RE: Everything Radial Engines

Thanks fella's!
Old 01-05-2008, 12:13 AM
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Default RE: Everything Radial Engines


ORIGINAL: Criage

Hi all

I have been following this thread since it began but this is my first post. I have just sold my full size Pitts S1S and promised myself once sold I would buy a Seidel 726 for my next RC project.

After seeing the new Seidel website I am now a little concerned the 726 may be no longer available[&o]. The diameter of the 726 would have suited my proposed projects perfectly. I see the new 7-250-B is writen as 3150x190 mm on the new website, assuming this is a typo and 315mm diameter is what was ment. This new engine would appear to be 15mm smaller then the 726 at 330mm dia.

Could someone please shed some light on this for me and perhaps point me in the best direction to purchase a 726 or 7-250-B (if the diameter is 330mm not 315mm)

I would like to go gas if I had the choice but Methanol would be ok as well.

This engne in my hands will see alot of air time as do all my engines. I have almost worn out my old OS 300 Gemini flying it almost every weekend for the past ten years in my 1/3 scale Pitts S1S.

Cheers Craige


----------------



Since you owned and flew the full size Pitts and the 1/3rd scale model of same, how did they compare in flight characteristics? I've always wanted to hear someone describe this situation. TIA


Ed Cregger
Old 01-12-2008, 09:31 AM
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Default RE: Everything Radial Engines

OK...Speaking of ASP 400's. I put one on the front of my World model GS Zero. Now the question. How did you get to the throttle arm on the motor? Its dead center of the fuel tank. Do I need to use a double bellcrank set up to get to it? That sounds like a lot of things to go wrong. any help would be great. Thanks. Jeff
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Old 01-12-2008, 11:28 AM
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Default RE: Everything Radial Engines

Engine looks great in the Zero jeffEE,
I have a Satio 325R in a Stearman and my Throttle "cable" simply comes thru the firewall
off center along the tank to the arm.
If your tank is real close up to the motor , you could mount a smaller servo onto the firewall.

Good Luck with the Zero ! Zagi
Old 01-12-2008, 12:42 PM
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Default RE: Everything Radial Engines

Jeff, wow that is a tight squeeze!

Are you going to put 'speed blisters' over the valve covers or just leave them exposed? In any case, I agree, it looks awesome in there!! Can't wait to see a flight video. Do you have a build thread with more pictures anywhere?

As for the thottle control, have you though of the Dubro flexible cable inside the nylon tubing? Those are amazingly slippery and can take crazy curves and routing and still do the job easily.

http://www3.towerhobbies.com/cgi-bin...?&I=LXD861&P=7
Old 01-12-2008, 02:50 PM
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Default RE: Everything Radial Engines

Mines a tight sqeeze too ive put a saito 170 into a Topflite seafury, the rocker covers are all touching the cowl but they dont seem to get hot enough too cause a problem.
Oh before any one comments on the lines on my SF i started to change it to a Hawker tempest MK2 but the then decided not to change the shape of the tail due to me added extra weight to the tail.
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Old 01-12-2008, 03:52 PM
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Default RE: Everything Radial Engines

more airplanes for radial engines, I love it. So how is the cooling on these motors? I was told that I need to place a baffle on the front of mine or i would have cooling problems.
Old 01-12-2008, 05:21 PM
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Default RE: Everything Radial Engines

Well since everyone is showing off their Radials , here's mine





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Old 01-13-2008, 10:03 AM
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Default RE: Everything Radial Engines

Radials.....man..... we have got to be crazy.
Old 01-13-2008, 10:09 AM
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Default RE: Everything Radial Engines

Just the pure SOUND of one running does it for me !!
Old 01-13-2008, 10:57 AM
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Default RE: Everything Radial Engines

I have the ASP 400 ,and from the videos i have seen of the SAito 325 running ,it sounds better than my ASP 400 ,it has more "radial sound". Any opinions?

Old 01-13-2008, 03:10 PM
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Default RE: Everything Radial Engines

Okay I have to toot my own horn here...
[link]http://www.rcuvideos.com/item/XKZ67Y65R7LHV5F9[/link]

St 710 Siedel 70cc radial its about 7 minutes long, but what a sound.
Old 01-13-2008, 03:13 PM
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Default RE: Everything Radial Engines

If you were to video record your's running it also would sound more
throater as the audio sound from the video camera makes it more pronounced.


Zagi_X
Old 01-13-2008, 10:40 PM
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Remember when we were discussing models for the radial engines, and the FS400AR in particular? Today I was at the AMA Convention, and talking to the owner of Pacific Aeromodel who make the big Gee Bee Y airplanes. I was asking him what he thought about using the FS400AR in the 97" GBY, I explained how it weighed a lot, and he suggested the smaller 82" wingspan version instead. The cowl on the smaller version is 10" diameter, so it would enclose the engine easily. But the weight of the motor in that plane? I dunno.....

BTW, the cowl on the larger version is 12" diameter.
Old 01-14-2008, 02:40 AM
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ORIGINAL: nilsreinert123

I have the ASP 400 ,and from the videos i have seen of the SAito 325 running ,it sounds better than my ASP 400 ,it has more "radial sound". Any opinions?

-----------------


Why do you suppose that to true? Aren't both engines running nothing but straight stacks?

Are you comparing the sounds of being there "live", or are you comparing recordings of the 3.25 R5 to the live sound of your 400? You really have to be careful when comparing live sounds to recorded sounds. One of my other hobbies is amateur music studio recording. You can make the best engine sound really crappy or super just by adjusting the equalization of the recording equipment.


Ed Cregger
Old 01-14-2008, 06:13 AM
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Default RE: Everything Radial Engines

Well , i am comparing Kmots videos on youtube to other videos of the 325 ,and the live sound of my asp which has a quiet idle sound. Ofcourse will the recorded audio sound be different. But maybe the 325 has a bit more put-put-like idle sound.? Saito`s are know for having a good sound ..
But i am just questioning . Maybe they have a similar sound.

Kmot ,the asp 400 should be ok on the 82" GB ,i am building a 80" FW190 for mine now. it has a cowl id of about 10" too.
Old 01-14-2008, 06:55 PM
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Default RE: Everything Radial Engines

there is a post in a GEE BEE thread here at RCU that shows a asp 400 in the big GEE BEE Y. The pilot says its a great match. I have a short vid of the first run of my asp 400. I will try to post it.
Old 01-14-2008, 07:54 PM
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Default RE: Everything Radial Engines

Hey, it was really easy to post a vid here. I just put in on the video page. Title is ASP 400. DUH! It should be ready for viewing soon. Its only about 1 minute long. But it was the first time the motor saw fuel, and I had not yet learned how to get all 5 cyl's to stay lit. Hope it sounds OK. Jeff
Old 01-14-2008, 09:46 PM
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Default RE: Everything Radial Engines

Sounds great Jeff !
Old 01-16-2008, 10:16 AM
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Default RE: Everything Radial Engines

I love these Radial engines. Great video chasrb, that thing it sounds great!
Now I'm going to have to buy one some day!
Old 01-16-2008, 03:27 PM
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Default RE: Everything Radial Engines

Thanks Warheadforever, now if I can only get the time to put it on the plane....
Old 01-17-2008, 09:32 PM
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Default RE: Everything Radial Engines

Got the GP Stearman PT-17 Tuesday and have a seven cylinder Technopower to mount to it. Anyone out there whose dont this got any infor for me.

Dave
Old 01-18-2008, 01:50 AM
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I have not heard of anyone else using the Technopower on the GP Stearman but it sounds like it will be a great combination.

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