Maxam

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Orion, I have seen vast differences between different props with supposedly identical specifications. The difference between a SEP 28x14 and a Xoar 28x14 was 500 rpm. Thats a bunch at the lower RPM's we are working with. -Tom

Heli-NuBee

I have the XOAR 22x10 three blade WWII style prop. I believe that is the same the Tom is running. I hope that it will work well.

Roger

Maxam

My Feedback: (62)

Roger that is the same prop and it unloads a bunch in the air and the plane takes off smartly. -Tom

slskn

My Feedback: (4)

resubmitted you tube videos on the Evo 999 Ziroli Corsair-Steve



http://www.youtube.com/watch?v=q-E9t...eature=related
http://www.youtube.com/watch?v=tAx0G...eature=related
http://www.youtube.com/watch?v=BOOUp...eature=related

Maxam

My Feedback: (62)

That take off was a bit overpowered!!!! Good prop choice for ultimate power. Ran a bit high rpm in the air. I wonder if Xoar makes a 24x12 3 blade? Very nice plane and demonstration of these engines power!!! -Tom

Linkan2

Hello everyone
Who has UMS / EVO 7-35 when will we see them in the air.
If you have a video to view it
Lars

Maxam

My Feedback: (62)

Lars, They have been backordered and have just arrived so the 7-35 and 9-99 are now available! There was a guy working on a big WACO from Hobby Lobby putting in a 7-77. I wonder if it has flown yet. I just got back from my field and flew the 160 gas a bunch. Lars I need to figure out a nice 7-35 project to do. I am thinking about replacing the electric motor in my Hangar 9 Spitfire with a Saito 100 inline. Electric just does not sound cool. -Tom

nilsreinert123

Hei! long time

On this page you can find pictures and a short video of my Pitts with a 7-35 : http://forum.strand-mfk.org/phpBB3/v...t=5&start=3825

I have had 15 flights on it now ,working on cooling fins on the cowling now ,since i have had overheating problems with the cowlin on.

The 7-35 runs much better than the ASP 400 , you dont have to think about glow heating at low throttle. which is an advantage i think

Orion09

My Feedback: (1)

Hi guys.On the Horizon site they advertise the Evo 777 with an improved carb with a split opening.Is there a new carb for the 777?Nice Corsair Steve.I bet the camera man keeps you on your toes.

Maxam

My Feedback: (62)

Nils, has been awhile. I remember your difficulties with the 400 in the 1930's Gilmore. Yes these 7-35's are very easy to run. -Tom

Linkan2

Hi Maxam
Saito 100 TI is a good choice.
  I have a TI in a DH chipmunk has worked very well
Yes it sounds better than the electricity
Lars

SOUTHERNX

Hi Maxam,I have purchased the Stinson Reliant SR9 built by Ecomrc,it has a wingspan of 100 inches and is built very light.Its flying weight is listed as 17lb10 oz(8kg) Unfortunately the Saito325 and the Siedel/ums/evo70cc will not fit in the cowl,but the Evo 35cc will fit perfectly.While the takeoff runs would be long and scale like(as in the old days of flying a 12 foot Telemaster powered by a 10cc OS 2 stroke) ,do you think the 35cc EVO at 2.2hp could fly this model(Stinson) without being too underpowered? Cheers ,Mark.

Maxam

My Feedback: (62)

Mark that plane sounds too large/heavy for this engine. Anybody else want to chime in??? -Tom

nilsreinert123

I also think the 7-35 will be to small to fly a 8 kg plane , it has just enough power to fly my 175cm wingspan pitts ,at around 6 kg (i am not sure about the weight)

Edit: i checked the spec's of my Pitts : 180cm ws. and 7.1 kg

With 100" wingspan i would have used a 325r5 or Evo 7-77 ,and i would not care to much about cut outs in the cowl

Heli-NuBee

I had something a little odd happen today with my Evolution 7-77 radial engine. I am installing the engine into a BH 91" Corsair and while working on the project I notices that some of the valve push rods seemed quite loose, in fact so loose that one of them fell out of the engine along with its cam follower. This made sure that I had to check the valve clearance settings. I found a number of the valves were way too loose. Yes, I checked the valves four times at every two revolutions. Checking and setting the valves took a couple of hours but it was not as difficult as I though it would be. I also checked the glow plugs while they were out of the engine to make sure they all lit up.

Roger

rcten

Nubee, did you lubricate the valves and rockers while adjusting, the valves maybe sticking which could allow the push rods to fall out?
just a thought. The valve system on the UMS is totally exposed and requires external lubrication.

SOUTHERNX

Hi Maxam,Hi nilsreinert123,thanks for your replies,the EVO35 Radial would struggle with a large bulky aeroplane like the Stinson 100 inch,but it sure would sound and look great !Looks like I will fit the Saito FG36or FA220, this will only require cutting a section from the bottom of that great looking 18 rocker cover cowl.The Saito200R3 will fit but swings a smaller prop at higher rpm and I don't own one of these engines.Cheers,Mark.

Dad_Roman

Hard to say. Tom has a ton of experience here in the last couple of years with all sizes of radials and thier performance in flight, so its hard to go against advise like that.

TBM says that 35cc class will fly it. A large scale prop on a radial (bigger than a 2 stroker) should work nicely.

Or get the original specs and see what the Power/Weight ratio is supposed to be.

But like most here. I am still in the building stage with no real world experience.

Think I would discuss it at great length with Tom......but thats just me

Maxam

My Feedback: (62)

Thank you for your confidence in me Dadroman. I did PM Mark. Folks permit me to invade the glow radials with my evo gas 160 radial. You can find it on youtube; Evolution 160cc 7 cylinder Gas Radial in RC OMP Yak. -Tom

Heli-NuBee

Hey Tom,

I could not locate your video on youtube (Evolution 160cc 7 cylinder Gas Radial in RC OMP Yak) - please post a link - I would love to see it.

Thanks,

Roger

Maxam

My Feedback: (62)

Roger, I have no idea how to do this. Sorry. -Tom

Maxam

My Feedback: (62)

Roger I did a search on youtube and found it right away! Try;evolution 160cc 7 cylinder gas radial. Make sure you use 7 not seven. -Tom

Heli-NuBee

OK, I found the video,

Thank for sharing Tom,

Roger

TANGLE

Hi All
This is my first time here,quick introduction ,been modelling a long time,I started with single channel,valves(tubes) and escapements! Enough of that it makes me feel old!! I've just ordered a evo777, my first radial, its out of stock and will be a couple of weeks , I'll just have to be patient.
I intend putting it in my Jungmeister which flies great with a Fuji 50.Its 75" span weighs 18 lbs.What can I expect perfomance wise compared to the Fuji bearing in mind the 777 is a good deal heavier?
I have found a couple of full size Jungmeisters which are flying without a cowl so I'll do the same which will help with CG(the cowl is quite heavy))
.And anyway why spend what to me is a small fortune on a lovely looking engine and then hide it inside a cowl?.
All the best Tim
http://flickrhivemind.net/Tags/fpbri,hirth/Interesting

Maxam

My Feedback: (62)

Tim, 18 pounds, use a 24x10 prop and expect solid spirited performance even at 1/2 throttle it will fly well. -Tom