Seidel 7-70 radial: Help me decide!
#51
RE: Seidel 7-70 radial: Help me decide!
ORIGINAL: abufletcher
And can you imagine what a stunning model it would make with a 9.5'' diameter radial engine!
And can you imagine what a stunning model it would make with a 9.5'' diameter radial engine!
Yes I can
Photos and movie are made back in 2005 with my first digital camera so the sound is not that good.. Model is fitted with the old type 770 Seidel. She made only 2 flights so far and the model has now a new owner who fitted the new UMS Seidel. Due to circumstances you missed the model at the Dutch Dawn Patrol.
[youtube]http://www.youtube.com/watch?v=OGbhMF8ZENc[/youtube]
[youtube]http://www.youtube.com/watch?v=thIeI_Llz4k[/youtube]
#52
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RE: Seidel 7-70 radial: Help me decide!
Those Dutch guys have all the fun! [] But that engine does look a tad big on that model. What scale is it? But it's REALLY nice to see a Seidel actually being used in a flying model.
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RE: Seidel 7-70 radial: Help me decide!
Surely by now you have seen this from OS...maybe a little pricey....
http://www3.towerhobbies.com/cgi-bin...?&I=LXZVB2&P=0
And then there is the Moki and the FW Pup....from Vogelsang Aeroscale....
http://www.vogelsang-aeroscale.com/jwpup.html
After nearly 40 years in aviation the only sound that make me run out and look is the sound of a radial..and maybe a Merlin or Allison.....
http://www3.towerhobbies.com/cgi-bin...?&I=LXZVB2&P=0
And then there is the Moki and the FW Pup....from Vogelsang Aeroscale....
http://www.vogelsang-aeroscale.com/jwpup.html
After nearly 40 years in aviation the only sound that make me run out and look is the sound of a radial..and maybe a Merlin or Allison.....
#55
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RE: Seidel 7-70 radial: Help me decide!
ORIGINAL: V2PLUS10
Surely by now you have seen this from OS...maybe a little pricey....
Surely by now you have seen this from OS...maybe a little pricey....
That looks like a great kit and the high degree of "pre-fabrication" (e.g. pre-finished struts and riggings wires) would probably appeal to many...though not necessarily to me. But then if you're going to build a kit, why not really have it be a kit rather than just a box of wood?
On thing that's interesting is that they say it would fly with either the Moki 150 or a ZG 62 with reduction gear. But I'm confused about the "size" of the Seidel 7-70. I would assume that either the 7-70 or the 9-90 could fly this model. But the Seidel website lists the 770 as 70ccm and the 990 as 90ccm. And I've thought of both as being more or less comparable to the Zenoah 62.
BTW, also notice that the cost of the ZG62 + reduction gear is MORE than the Seidel.
#57
RE: Seidel 7-70 radial: Help me decide!
There were different versions and one was the Anzani powered version without a cowl and with an exhaust collector ring like my friend used on his Seidel.
The Anzani powered G3 is in the RAF Hendon museum.
The Anzani powered G3 is in the RAF Hendon museum.
#58
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RE: Seidel 7-70 radial: Help me decide!
ORIGINAL: Airwarrior
Great looking plane, but Mr. Pilot doesn't look too healthy! Tell that chap to straighten up!
Great looking plane, but Mr. Pilot doesn't look too healthy! Tell that chap to straighten up!
#59
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RE: Seidel 7-70 radial: Help me decide!
I agree that the cost of the OS and Moki's are high when you compare them to the cost of the Indian made Seidel. The old Technopower engines and the Seidel really do have the "look" of the old radial.
What has always stopped me(aside from cost!), is the prop speed/rpm. Most the WWI rotary engines had an operating rpm of around 1200. This is what looks and sounds realistic. Somewhere I've seen a video of a large model Pup with the reduction gear, and the prop rpm is fantastic....but the sound is high pitched two-stroke...by comparison, the sound of a model radial is wonderful, but at flight rpm the romance goes away, as the sound of that high reving prop overshadows the sound of the exhaust.
On one version of the the R-4360, max takeoff rpm was 2700, the prop was run through a 0.375:1 reduction, which gives a prop rpm of about 1012. Climb and cruise rpms would have been much lower.
I would love to have something with a radial engine just the same...though a Pup may be lacking the wow factor, that would still be my choice.
Realism is elusive.
Randy
What has always stopped me(aside from cost!), is the prop speed/rpm. Most the WWI rotary engines had an operating rpm of around 1200. This is what looks and sounds realistic. Somewhere I've seen a video of a large model Pup with the reduction gear, and the prop rpm is fantastic....but the sound is high pitched two-stroke...by comparison, the sound of a model radial is wonderful, but at flight rpm the romance goes away, as the sound of that high reving prop overshadows the sound of the exhaust.
On one version of the the R-4360, max takeoff rpm was 2700, the prop was run through a 0.375:1 reduction, which gives a prop rpm of about 1012. Climb and cruise rpms would have been much lower.
I would love to have something with a radial engine just the same...though a Pup may be lacking the wow factor, that would still be my choice.
Realism is elusive.
Randy
#60
Thread Starter
RE: Seidel 7-70 radial: Help me decide!
ORIGINAL: V2PLUS10
The old Technopower engines and the Seidel really do have the ''look'' of the old radial.
The old Technopower engines and the Seidel really do have the ''look'' of the old radial.
What has always stopped me(aside from cost!), is the prop speed/rpm. Most the WWI rotary engines had an operating rpm of around 1200. This is what looks and sounds realistic.
1. The mock realism of having a functioning "round" engine (though still not a rotary and still not exactly scale).
2. The ability to swing a scale diameter prop without the expensive (and sometimes fussy) reduction gear.
Realism is elusive.
#61
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RE: Seidel 7-70 radial: Help me decide!
The 22" prop you mention is quite close to scale diameter for most quarter scale rotary engined aircraft. The drive reduction units you often mention turn props in the 30 inch range and some larger, closer to 1/3 scale and most ofen used in that size aircraft. The Mick Reeves unit and a G62 combined are still less than the Indian Seidel.
Doc
Doc
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RE: Seidel 7-70 radial: Help me decide!
But he has almost got me talked into it!! 995 euro is about 1300 USD hmmmm......we spent that much on a section of fence this spring....!!
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RE: Seidel 7-70 radial: Help me decide!
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RE: Seidel 7-70 radial: Help me decide!
Randy,
As long as you realize it is a questionable copy of a Seidel. The guys remarks about receiving them dirty makes me wonder. A thousand dollar + paperweight is expensive artwork!
As long as you realize it is a questionable copy of a Seidel. The guys remarks about receiving them dirty makes me wonder. A thousand dollar + paperweight is expensive artwork!
#66
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RE: Seidel 7-70 radial: Help me decide!
ORIGINAL: Reg Hinnant
Awwww come on Don, now your beginning to talk your self out of it........[sm=tongue_smile.gif]
Awwww come on Don, now your beginning to talk your self out of it........[sm=tongue_smile.gif]
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RE: Seidel 7-70 radial: Help me decide!
Well, you have talked me into believing that you really need one to be satisfied......
We would all enjoy watching you get immersed in the installing, care & feeding of the little beast.
I can’t think of a better caretaker to document that progress to a successful conclusion
We would all enjoy watching you get immersed in the installing, care & feeding of the little beast.
I can’t think of a better caretaker to document that progress to a successful conclusion
#68
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RE: Seidel 7-70 radial: Help me decide!
Seems one of the issues with the small radials is getting an even distribution of the fuel mixture to each of the cylinders. You can have one or more hot cylinders with the others at normal temp. The OS pictures show a built in diffuser. The smaller Moki's can benefit from an add-on diffuser, but I don't remember if it's factory or after-market.
Reg, you had an original Seidel....did you ever fly it?
Randy
Reg, you had an original Seidel....did you ever fly it?
Randy
#69
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RE: Seidel 7-70 radial: Help me decide!
ORIGINAL: Reg Hinnant
As long as you realize it is a questionable copy of a Seidel. The guys remarks about receiving them dirty makes me wonder. A thousand dollar + paperweight is expensive artwork!
As long as you realize it is a questionable copy of a Seidel. The guys remarks about receiving them dirty makes me wonder. A thousand dollar + paperweight is expensive artwork!
Seidel states that it test runs every engine...and it fact the "manual" that Teus uploaded actually says they "test fly" every engine (though this could be an English translation error) and states that if the buyer intends just to use the engine for display they can request that the engine isn't test run. BTW, my RCV engine arrived covered in oil...and that's probably a good thing.
#70
RE: Seidel 7-70 radial: Help me decide!
I just got to see a Gnome 50 HP run at Oshkosh, Friday, and I was kind of surprised at the sound. It was loud, but not too loud; you could hear the whirl of the cylinders as much as the exhaust. The exhaust stroke happens at the same point in rotation, so it kind of sounds like a single cylinder with a lot of mechanical noise going on with the odd misfire. It sounded like a single 4 stroke with no muffler at 1/3 throttle with a bunch of mechanical clacks and a house box fan blowing. It does not have the pack of Harleys sound like a radial. It also had the same sound quality of the cars at the same time, too; the sound is of Model T not modern smooth Ferrari. The smell was classic for a modeler; it smelled exactly like a Cox .049 running Cox fuel.
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RE: Seidel 7-70 radial: Help me decide!
Seeing, hearing, smelling and maybe getting a little oily from a rotary engine is on my to do list......I am consumed with envy....
Randy
Randy
#72
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RE: Seidel 7-70 radial: Help me decide!
ORIGINAL: TFF
It does not have the pack of Harleys sound like a radial.
It does not have the pack of Harleys sound like a radial.
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RE: Seidel 7-70 radial: Help me decide!
Your right on the money TFF.
You guys really should purchase Hansen's DVD on Areodrome 92 & 94 and his ones on the filming of Young Indiana Jones. They were there at Frank Ryders museum specificly to get the aircraft sounds correct.
The old rotarys were smooth and had a hissing sound along with the exhaust. They do not sound like a radial.
Done Coe with his Pup and a Laser V twin that had the exhausts ending with a narrowed tip (ah la old Harley fish tail exhaust tips) came close with a hissing sound along with the exhaust sound. See his build thread.
Randy, I did not put my Seidel in a model. I had decided that it was not that suitable in a WW1 model & was waiting for Jerry Nelson of Nelson Hobby Specialties to finish his kit of the Meyers OTW. I think it would be more appropiate in a "between the wars" A/C or something that had a true radial engine.
Sorry Don........
You guys really should purchase Hansen's DVD on Areodrome 92 & 94 and his ones on the filming of Young Indiana Jones. They were there at Frank Ryders museum specificly to get the aircraft sounds correct.
The old rotarys were smooth and had a hissing sound along with the exhaust. They do not sound like a radial.
Done Coe with his Pup and a Laser V twin that had the exhausts ending with a narrowed tip (ah la old Harley fish tail exhaust tips) came close with a hissing sound along with the exhaust sound. See his build thread.
Randy, I did not put my Seidel in a model. I had decided that it was not that suitable in a WW1 model & was waiting for Jerry Nelson of Nelson Hobby Specialties to finish his kit of the Meyers OTW. I think it would be more appropiate in a "between the wars" A/C or something that had a true radial engine.
Sorry Don........
#74
Thread Starter
RE: Seidel 7-70 radial: Help me decide!
ORIGINAL: Reg Hinnant
Randy, I did not put my Seidel in a model. I had decided that it was not that suitable in a WW1 model & was waiting for Jerry Nelson of Nelson Hobby Specialties to finish his kit of the Meyers OTW. I think it would be more appropiate in a ''between the wars'' A/C or something that had a true radial engine.
Sorry Don........
Randy, I did not put my Seidel in a model. I had decided that it was not that suitable in a WW1 model & was waiting for Jerry Nelson of Nelson Hobby Specialties to finish his kit of the Meyers OTW. I think it would be more appropiate in a ''between the wars'' A/C or something that had a true radial engine.
Sorry Don........
#75
Thread Starter
RE: Seidel 7-70 radial: Help me decide!
Let's have another look. As I said, I think the 7-cylinder actually looks a bit more "mock-scale" than the 9-cylinder. Maybe 18 rocker rods is a bit much. And I think the all "silver" cylinders of the newer Indian engines might actually be better suited to WWI models.
But really, the main reason is still to be able to use fly with a scale diameter prop. The Seidel 770 is designed for a 22" prop while a G26 turns a 16" prop.
But really, the main reason is still to be able to use fly with a scale diameter prop. The Seidel 770 is designed for a 22" prop while a G26 turns a 16" prop.