Glow Engines Discuss RC glow engines

Everything Radial Engines

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Old 09-15-2017, 07:58 PM
  #3776
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Quote:
Originally Posted by Radial power View Post
Thank you very much.

Oh, and another couple of little things that I forgot: these multicylinder engines have a lot of metal to warm up when compared to a single cylinder engine with the same displacement. And they also have much more cooling fin area to dissipate heat. So don't be surprised if the engine takes a while to fully warm up.

For the first runs I'd avoid using exhaust collector rings and instead I'd run the engine on a test stand with the 7 independent exhaust pipes. This way it's much easier to see if a cylinder is not firing: you only need to place your hand an inch or so behind the outlet of each exhaust stack and feel whether the pulses coming out of the stack are crisp, "hard" and hot exhaust pulses (indicating that the cylinder is firing) or much weaker lukewarm "puffs" (indicating that the cylinder is not firing). You can always fit a collector ring at a later time if you want to, when you are sure that you do not have problems with dropping cylinders.
Thanks, I wasn't planning on using the collector ring at first for the very reason you mention.

Tom

Last edited by tdevince; 09-15-2017 at 08:14 PM.
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Old 11-04-2017, 01:41 AM
  #3777
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Hey guys,
I am selling my beloved Aero A-102, complete with Seidel ST 770 radial engine. Send me a PM if you're interested.

Here's a video:


And here's the full flying Video. Don't judge me for my landing! I have done waaaay betta!



Cheers, Martin

Last edited by Spuetz; 11-05-2017 at 04:46 AM. Reason: added video, fixed mistakes
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Old 11-06-2017, 01:33 AM
  #3778
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Nice flying sounds good
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Old 11-06-2017, 09:08 AM
  #3779
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Default UMS Radials

A buddy of mine just attended an RC trade show in Germany. UMS has parted ways with Horizon, has redesigned the "Evolution" radials (NO longer called Evolution) and is offering all the engines as GAS now. Not sure if they will continue with the glow versions of the 7-35, 77, and 9-99. He was also told UMS will be coming out with a 250cc 5 cylinder to compete directly with the Moki 250 AND Koln clones!!
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Old 11-09-2017, 10:13 AM
  #3780
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Quote:
Originally Posted by Old Fart View Post
Nice flying sounds good
You're very kind. I'm sooo embarrassed with my landing... BTW - I fly in Australia as well - not the gas powered ones, though... have a place in Sydney...
Cheers, Martin
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Old 11-09-2017, 11:06 AM
  #3781
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tower has the Sirius 300 radial on clearance today. $2600

Jenny
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Old 11-16-2017, 07:06 AM
  #3782
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Quote:
Originally Posted by Jennifer Curtis View Post
tower has the Sirius 300 radial on clearance today. $2600

Jenny
I assume you mean the FR7-420 Sirius7, as the old Sirius 300 has long been discontinued.
It must have been a very brief price dip, as I have written a small program that checks for the price of that engine (and the FF-320) on Tower Hobbies every 6 hours to alert me via email of any price drop, and it noticed nothing unusual around november 9th. Price stayed at $3499.99 all the time.

Or it could be that there is a bug in my program, even though it clearly kept on logging $3499.99 the whole time
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Old 11-16-2017, 07:27 AM
  #3783
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Quote:
Originally Posted by Radial power View Post
I assume you mean the FR7-420 Sirius7, as the old Sirius 300 has long been discontinued.
It must have been a very brief price dip, as I have written a small program that checks for the price of that engine (and the FF-320) on Tower Hobbies every 6 hours to alert me via email of any price drop, and it noticed nothing unusual around november 9th. Price stayed at $3499.99 all the time.

Or it could be that there is a bug in my program, even though it clearly kept on logging $3499.99 the whole time
Tower does show they still have the FR5-300 in stock for $2499
https://www.towerhobbies.com/cgi-bin...&I=LXBY70&P=SM

I haven't seen a price drop on the FR7-420 yet either.
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Old 11-16-2017, 07:33 AM
  #3784
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No, it was definitely the Sirius 300 radial.
It was still on sale yesterday, but today it
is gone from the clearance list. Apparently
it got sold.

Jenny
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Old 11-16-2017, 07:45 AM
  #3785
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It's still there, at least as far as the "In Stock" tag on the page the link references. When it comes to a five-cylinder glow radial, I usually go with the Saito ...
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Old 11-16-2017, 11:14 AM
  #3786
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Quote:
Originally Posted by tdevince View Post
Tower does show they still have the FR5-300 in stock for $2499
https://www.towerhobbies.com/cgi-bin...&I=LXBY70&P=SM

I haven't seen a price drop on the FR7-420 yet either.
What the...

I have checked the "OS 4 stroke glow engines 1.2 cu. in. and up" page many many times, and the only radial there was the FR7-420. I haven't seen the FR5-300 in that page in the last 10 years
OS doesn't list it in its page either: O.S. Engines Home Page . Actually it's among the discontinued engines: O.S. Engines Parts Listings for Discontinued Engines

Well, I already have one of those, so I'm all set. I need the bigger one
Still waiting for a FR7-420 price drop (there was one drop last spring if I remember correctly, and it was that price drop that prompted me to write the little program I mentioned earlier).
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Old 11-16-2017, 11:21 AM
  #3787
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So it looks like the price of the Sirius 300
dropped from 2600 to 2500 now.

Jenny
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Old 11-16-2017, 11:34 AM
  #3788
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Unfortunately I don't have a home for the FR5-300 so I don't need it. But I do have a potential home for the FR7-420. Just waiting
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Old 12-08-2017, 09:23 AM
  #3789
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Well the FR5-300 Sirius radial is back on clearance again,
this time for $2320.

https://www.towerhobbies.com/cgi-bin...&I=LXBY70&P=SM

Jenny
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Old 12-08-2017, 11:37 AM
  #3790
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That's a LOT of money for a 300 sized engine. You could buy a Saito FG60 for half the price.
Or if you prefer a UMS 777 radial..
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Old 12-08-2017, 07:56 PM
  #3791
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I had the FR5-300 Sirius radial engine for a while. Gave me nothing but trouble. Most of the time only ran on 3 cylinders. I sold it and never looked back.
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Old 12-08-2017, 08:51 PM
  #3792
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I think the Saito has some advantages over the OS in the five-cylinder radial - that diffuser ensures a good charge to each cylinder. OS definitely has the better carb, though.
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