Evo 36 photos

As you can see the engine came well packaged. I am very pleased with the overall product especially for the price. As you can see the remote needle valve assy along with the venturi weighs a considerable amount. I think weight can be saved with a Nylon venturi along with a Tigre type needle valve assy. The proof will be in how the engine performs with a load, "airplane"

Considering you get three venturis, two mufflers, and a so called "super plug" the price is very reasonable considering after market costs for these products. I am anxious to see how it perform


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Why change the NVA??? Give it a chance! If you'll notice the engineers took the time to redesign the config. of the fuel nipples on the NVA compared to the R/C version. I'm guessing most likely to align the nipples with the venturi spraybar for consistent feed in all attitudes.
Also what is the true weight WITH tongue muff. AND NVA assy?

>>Also what is the true weight WITH tongue muff. AND NVA assy?<<

As shown in the photos the motor with out tongue is 9.2oz. The Tongue is .6oz for a total of 9.8oz.

You will also notice the motor with out the remote needle valve assy is 8.5 oz. The venturi alone is more than a half oz. All I am saying is the engine has the potential to save about an oz with a Delrin Venturi and standard needle valve ass.

Note also the glowplug mounts at a angle top to the rear. Instructions say use a there special glowplug.
Ed

Mike, got mine yesterdeay. What venturi will you be using? The instructions say use the middle size one. Is that the one already mounted on the engine? What plane will you be trying it on? I may use the Sig Primary Force. Call me!

Joe
Never Give up! Never Surrender!

Does anyone know if this thing will match any other engines mounts? I'd like to be able to drop it into an existing airplane for test flights.

It fits the same mounts as Thunder Tiger and Magnum 36. Shaft length is also the same (or very close) so it went into the Primary Force with no problems except for the rear needle valve. Tank plumbing is difficult with the RNV and the assembly had to be loosened to get the muffler mount bolts installed. It does weigh 1 oz more than the Thunder Tiger 36 so I have switched to a wood prop for the first flights. I have a 10X6 RSM installed, but am taking an 11X4 to the field with me. I hope the weather is OK here tomorrow so I can try it.
Steve

What about the muffler bolt pattern? Does an OS .40/.46LA muffler fit, by chance? The 2.1 oz weight isn't all that bad. And which Magnum .36 mounts does it match up to....round head XL or square head XLS? Steve

Steve Helmick
Renton, Washington
USA

I only have the square head Magnum, so that bolt pattern it matches. The muffler bolt spacing is also the same as the Magnum and Thunder Tiger. I'm a little worried about the limited needle valve travel, but I'll be a lot smarter tomorrow morning.
Steve

Hey Garf and others,
the EVO 36 will bolt in directly behind the OS 32 SX the muffler will fit also, so if like me you have some models with OS 32's in/on them you can bolt these right behind them.
I am gonna try to find a nva assy that will fit also. The holder? that keeps the venturi in is mighty large, so I'll have to do some sleeving down for another nv assy...
I have about 45 min on each of my Evo 36's now and hope to fly one this week end..

> I am gonna try to find a nva assy that will fit also. The
>holder? that keeps the venturi in is mighty large, so I'll
>have to do some sleeving down for another nv assy...

I'd call the venturi keeper a "draw bolt", I think...if it's like the ones used on some other engines...TT's, ST G.51's, etc. FWIW, the "standard" for most spraybars is .156" dia, but RO-Jett's are .187", I hear. Maybe that info will help, or not. Should also be possible to make a flanged bushing for each end of the spraybar of your choice, to also lock the venturi in place. Steve

Steve Helmick
Renton, Washington
USA

>Mike, got mine yesterdeay. What venturi will you be using?
>The instructions say use the middle size one. Is that the one
>already mounted on the engine? What plane will you be trying
>it on? I may use the Sig Primary Force. Call me!
>
>Joe
>Never Give up! Never Surrender!
Mine came with the large venturi installed.

>Note also the glowplug mounts at a angle top to the rear.
>Instructions say use a there special glowplug.
>Ed
The plug looks like a standard 4 cycle. It should do well.

Got mine yesteday as well. No time yet to do a detailed look but seems to be a lot of quality for the money.
I do wish that the lawyers/do gooders had not insisted on the remote needle. Unfortunately, it is not look like it is going to be real easy to convert to front needle with a simply machined venturi.
Will maybe get some stand runs later today or tomorrow.
Jim

>I do wish that the lawyers/do gooders had not insisted on the
>remote needle. Unfortunately, it is not look like it is going
>to be real easy to convert to front needle with a simply
>machined venturi.

What's wrong with the remote needle? I have always found them to work interchangeably with conventional needle/spraybars.

Brett

>
>>I do wish that the lawyers/do gooders had not insisted on
>the
>>remote needle. Unfortunately, it is not look like it is
>going
>>to be real easy to convert to front needle with a simply
>>machined venturi.
>
> What's wrong with the remote needle? I have always found
>them to work interchangeably with conventional
>needle/spraybars.
>
> Brett

Ditto! (- especially when the are specifically designed to do just that...)

What's needed is a professional evaluation of this engine along with the new OS .35AX. Another potential gem, although pricey...

>What's wrong with the remote needle? I have always found them to work interchangeably with conventional needle/spraybars.

Brett
1.Takes up space that sometimes does not exist in tight tank installations.
2.Some have reported erratic needles. Would not know as I always immediately convert to conventional needle.
3.Violates the KISS principle.
4. Looks funny/strange/unconventional
Jim

I found a quick and dirty way to convert to a front NVA. Remove the fuel jet and install an OS R/C NVA in its place. The outlet may have to be trimmed and shaped, but it works.

I got one flight in this morning with my EVO. I set it in a wet 2 on the ground and it leaned out a bit in the air. No question that this thing has plenty of power. I used a 10X6 RSM prop and 10/22 PowerMaster fuel and my Primary Force was turning 4.1 sec laps. The good news is that even running this fast, the engine was very consistent on both insides and outsides, never missed a beat, and did not sag in consecutive maneuvers. The engine had only one tank trough it prior to flight, so not much break-in is necessary. I deliberately short-tanked it for test flight and it ran about 5 minutes on 2.5 oz. For next flying session, I plan to switch to the tongue muffler to reduce weight and move CG aft a bit.

So far, so good. I have several ideas for replacing the aft needle valve, but if it continues to work OK, I'll just leave it as-is.

Steve

Read the instructions, filled the tank with 10/17, put my thumb over the venturi, flipped it 7 times, placed the glo driver on the plug and gave the Singer 11 x 4 two flips and it ran at 9300. I didn't changed the venturi that came with this engine. I used the tounge muffler. Second run was the same. I really like it!
Joe

Never Give up! Never Surrender!

> I used a 10X6
>RSM prop

!!!!

>turning 4.1 sec laps. The good news is that even running this
>fast, the engine was very consistent on both insides and
>outsides, never missed a beat, and did not sag in consecutive
>maneuvers.

Try a 10-4.

Brett

My Evo 36 that I converted from an rc motor likes a apc 11-4

> Try a 10-4.
>
> Brett

Brett,
Thanks. There is one in the flight box now. I also have a 10.5X4.5 to try. From other inputs, the engine will run a 4-2-4 break, so it may be fine if set a bit richer on the ground.

I know how you feel about engine modifications, but the rear needle valve installation is pretty heavy and a bit cumbersome. That is why several new owners have been looking at alternatives. I have been looking at possible installation in a Vector 40, but fuel line routing looks difficult. With an airplane built from scratch for the rear needle valve, it may work out fine, but most of us are trying to get the new toy into an existing airplane.

Steve

I can't seem to get a clean 4 cycle on mine. Can anyone else get a clean 4 cycle, or is that not in the cards.

I have had no problem with mine. I am using two lines from a Sullivan tank, one to he fuel nipple the other from the tank to the mufler.Are you using muffler pressure?
Joe

Never Give up! Never Surrender!

Here's are short video of a bench run of an Evo .36
http://www.youtube.com/watch?v=Bs_7jKct0_Y

Fred

Fred,
Maybe your moniker should change to "have batteries, will video!"

2 thumbs up!

The first few runs used muffler pressure. It sounds a lot like the one in the video.