Dm-pilot

hi guys,
all with the Christmas holidays! I am writing to you from Russia, so forgive my English.
Currently rework my plane - Super Stearman fron Graet Planes http://www.espritmodel.com/index.asp...D&ProdID=11903
now is the engine OS Max FS 200, but this is to much, so I decided to buy more large-scale engine - due to the sound, and power less.





the choice is between Saito FA-200 R3 (30cc) with Keleo muffler http://www.keleo-creations.com/index...roducts_id=210
http://www.espritmodel.com/index.asp...D&ProdID=13884

or Seidel 7-35 (35cc)
http://www.umstech.in/view_product_d...odel%20Engines

tell me, have a more massive engine and a low sound?
cost is very high for me, but I'm willing to sacrifice for the sake of similarity of scale and aesthetics of a biplane.
Heard that the Indian manufacturing motor does not really, have any problems with the delivery and timing, and the Seidel ruined and bankrot...

In general - help they can. I would be very grateful to you, we in Russia these motors there is only 7-70, but for me it's a lot of weight.

Thank you all, Dimitri.
-
If you have a video of the engine - you'll be very grateful.
And yet - tell me, can you have among the owners of this engine seidel 7-35- tell me how good it is in operation, there is some unpleasant drawbacks, and that this motor could be wrong?
what the real attraction (killograms) and a better use of the screw?

tezhe all questions of interest and respect engine saito Fa-200 R3 (radial)

maybe I'm not quite clear writing, just do not know how to say it differently.
In any case - you'll ochent grateful.
Dmitry.

abufletcher

There aren't too many Seidel/UMS 7-35 engines around, so you might have a hard time finding someone with personal experience. I did see that there is a new version of the 7-35, which now looks more like the 7-70.

Dm-pilot

Yes, yes, so ...
I saw this engine 7-35 in the old version - when the pushers are in parallel - both here on this video ...
[youtube] http://www.youtube.com/watch?v=ozPiY...layer_embedded[/youtube]
I'm interested in is the new version, which is similar to 7-70.
Some people wrote that when ordered at the UMS this engine, but receives an old version of the ...

in any case - I'll just any innformatsii.

abufletcher

Personally, I prefer the look of the old version with the parallel rocker rods, but that's just because it makes it look more like a WWI engine. The new version looks more like the 1930 radials.

The prices have increased about 150 Euros since I order my 770 in October!

abufletcher

I've heard it's best to run the Saito 3-cylinders with on-board glow because it's very common for one cylinder to "drop out" and that means you'd then only be flying on two cylinders at 2/3 power.

Dm-pilot

Thank  you!
i know that the Saito Fa-200 need a on-board glow - jn every my 4-stroke engine i use this.
What you thik - on Seidel needs on-board glow too?

and else - any single-cylinder engine to power corresponds Saito Fa-200 R3?
What do you think?

about SEIDEL 7-35:
Yesterday I wrote to Indian producers, but they are silent on the timing of delivery of 7-35.
A new modification for me is more appropriate because I do not have aircraft of World War II.

How reliable is the work of 7-35, how do you think?
what could be the disadvantages?
any ignition --I use?
Is there a scale mufflers on 7-35?

Yes, somewhere on this forum have read what people choose a new modification of the engine, but they receive from the manufacturer old. How can I avoid this?

BobH

My Feedback: (2)

The Saito 180 is about the same power as the Saito 200r.

What ever UMS is selling is what you will receive regardless of what was available in the past.

As far as I know the 7-35 should be as reliable as any other Seidel.

Dm-pilot

Thanks for ansver!
How single-cylinder engine to power corresponds Seidel 7-35?
What do you think?

What, in your opinion, may be the main shortcomings of the Seidel engine?

BobH

My Feedback: (2)

I think that the Saito 180 FS or the OS 200 FS (more powerful) are both similar to the Seidel 7-35.

I don't think there is a down side to the Seidel other than it's expensive. I bought a Seidel 7-70 recently to use in 1/4 Scale WWI planes. I haven't had a chance to run it yet.

Sundownee

My Feedback: (30)

Hi guys, actually it was great to find this post, I am actually looking at the 7-35 myself, going to put it into a KMP AT-6 Texan 88 inch wing span, 1.56 scale the cowl is 9 inch in diameter at longest and 8 1/2 at the narrowest point. which this engine would look great in for scale.
but my question is, the plane calls for a 30 to 42 cc engine, this engine being at 35 cc and only weighting 2.9 lbs, do u think is a good match for power, as I do not want speed just pulling power with a 20 X 5 prop?

Paul

carlbecker

My Feedback: (3)

The GP Stearman does not need a lot of power. I flew mine with a older heavy Saito 120. It would be a shame to cover the Seidel with a cowl though. IMHO all radials should have onboard glow. I run McDaniels on my Saito 450 and Saito 325.

Sundownee

My Feedback: (30)

Guys any ideas as if this setup will work, I beleive that a 18 X 8 prop would be better yes?

I spoke to ums, they told me that the new 7-35 will ready to ship by the middle of the month, I have to make a decision quick tho, as they are going to use a new distributor and you will not be able to buy direct anymore.
If I go with the bigger ST7-70, it weights 5.9 lbs awith 4 hp, that might be too much for this plane , also the engine overall dia is 9.25 whic will not fit the org cowl.

thanks for your input
Paul

abufletcher

As someone who just recently purchased a Seidel 770 (from UMS) I'd say that the only rational way to approach this is to ask yourself if you REALLY want a Seidel and will worry about what model if fits into at some later date. So do you really want this 7-35 so much that you don't mind if it might not be right for this particular model?

And I believe if you take this approach, then it probably ultimately makes more sense to get one of the 770s.

HornetFitter

My Feedback: (2)

That's funny Abu... It's exactly what I did... I got the first Seidel/UMS 7-70 from Hobby King last spring and have been looking for a suitable airframe ever since...Going to get a Keleo collector ring for a better exhaust system...
The only downside I can possibly see is the lack of spare parts, unless UMS will provide them.

abufletcher

Did you see that UMS seemed to now be offering the Seidel style collector ring for 110 Euros? That seems like a very good deal. I lucked out with someone here on RCU selling a NIB Keleo ring, otherwise I think I'd be looking hard at the UMS ring. That having been said, I do think it should be possible to run the 770 without a ring in a WWI cowled model.

I've already got several candidates for the first model with the honor or carrying my 770. The "safe bet" would be a 1/4 scale Pup. A sexier option would be a 1/4 scale EIII, and the "wow wee" choice would be a full-out 1/4 scale replica of the Sopwith Tripe. I have the plans for all three.

The way I see it, you don't buy a thousand+ dollar engine to stick in ONE model.

carlbecker

My Feedback: (3)

I see from the site KMP suggests a 26 to 32cc engine and 87" ws. I would use a prop with more pitch. If the weight is more than 25 lbs I would try a 10 pitch first. I don't think there would be enough forward speed to fly well otherwise. I don't know the operating rpm of this motor but the 770 does not spin up alot so I would want more pitch so fly at least 50 mph or so. I don't have a need for speed but I like a plane to groove well and not be mushy.