Maxam

My Feedback: (62)

Steve, Oh no not after each flight!! That would be awful. That would take away from the joy of the one flip start every time for the next flight. Yes the method you mentioned is correct. One time I flew 8 times my 9-90 in a perfect dead calm evening. That was fun. -Tom

slskn

My Feedback: (4)

oh ok that`s what I thought, thanks again and happy flying-Steve

Cristian2fast4you

Hi all,

Finally, past Saturday my Evo 7-77 has made his first flight! Great engine. I love it!


And the sound....
http://youtu.be/n4iXbgbv6Lw

slskn

My Feedback: (4)

well got 2 more flights on the Stearman Sunday and the 7-77 is running perfect and got 2 flights on the Corsair with the 9-99 and same thing, running perfect, all is well and "life is good" Happy flying to all-Steve.

Maxam

My Feedback: (62)

Such good news! Great to hear it Steve. These engines are a lot of fun. They saved me from loosing interest in the hobby. Keep 'em coming Pete! -Tom

Pull Up Now!

My Feedback: (3)

For anyone who is interested in the exhaust rain project, here is a link that explains the difference between silver soldering and silver brazing. The two terms are often used incorrectly interchangeably. http://www.homemodelenginemachinist....-solder-22938/

slskn

My Feedback: (4)

here are 2 short touch and go video`s of the Stearman that my other camera man got, sorry so short.
1. front seat "rookie pilot" http://youtu.be/gGYaECoumzY
2. rear seat experienced pilot ( actually the builder)Ha, Ha, Major Courtney Payne, for real, http://youtu.be/FH4mGyR9-o4

Linkan2

Hello all
today so va the time to try stearman with 7-35 after repair.
But I been disappointed with the updated carburetor & 18x8 prop-
no nitro and no pressure to tank.
Motor gave 6200 rpm on the ground, but sounded tired in the air
What to do?
Lars

Maxam

My Feedback: (62)

Lars, Make sure the idle screw is not too far screwed in. If it is it will not allow enough fuel in at higher throttle positions. -Tom

Linkan2

Yes Tom, I'll do the careful control, it's probably too much into screwed.
But does anyone have experience with other prop than 18x8 to 7-35 -
for better power?
I'll try with 10% nitro & overpressure til the tank.
Now with the new carburetor has a wider diameter = lower air speed
Lars

Maxam

My Feedback: (62)

Lars, Always try different brands of props. I like the 17x10 XOAR -Tom

EQ1

Lars, what you describe as "sounding tired" is a lack of thrust at higher speeds. Your 8" pitch at 6200 rpm yields a pitch speed of around 47mph, which is really low. Just try a higher prop pitch, maybe with lower diameter. Your revs are also too high for my liking concerning these engines. These engines produce more torque than rpm. Hope this helps.

Linkan2

before had up over 7000rpm, going out and try tomorrow.
Have adjusted the idle needle, I mounted tube on the hose for blow, barely no air flow.
I adjusted from 1/8 ​​turn = better airflow
so I write in Saturday
Lars

Linkan2

Hello again
I was and test flew today.
It works better now, but not like before.
Can add, it is uneven compression is, the piston rings are leaking.
I'm waiting for a 17x10 to try
Can say that but stearman weighs 7.3 kg
Lars

TimD.

My Feedback: (207)

Here is a pic of my corsair , finally finished the change out from the G-62. weighted 31lbs with the g-62 now it is down to 28lbs with the 777. She is a kit built TF that I did about 8yrs ago. I have the engine turning 4800-4900rpm on the ground with the prop adjusted to about 20x15 3 blade.

Maxam

My Feedback: (62)

Tim, Your airframe will certainly enjoy the decreased vibration. 4 pounds less! wow!

pappy 883

My Feedback: (2)

Man that TF F4U looks great with a real radial........time to think about a swap !!!

slskn

My Feedback: (4)

hello guys,
not really wanting to open up this topic again but, wanting to mix my own fuel, got access to all the methanol I want and wanting to use the KLOTS oil with the 80% synthetic and 20% castor blend and I have a possible chance of getting some nitro, I need to get the formula of the percentage right, now at 128 oz. in a gallon how much of this is minus the oil and nitro? in other words do I subtract for example at 5% nitro would be 7 oz. so would I subtract 7 oz. from the 128 oz. and so on with the oil? so it all equals 128oz.? to make it one gal.? just asking for some in put so I have the right mixture. I know I could cut the Wildcat fuel that I am currently using on my other models but trying to since I have the access to all the methanol I want make some home brew thanks fella`s just asking-Steve

Dad_Roman

To keep it simple......Yes

Percentage relates to any given amount soooo........

Of the 100% of the given amount (be it one quart, one gallon or one hundred gallons) the breakdown is as such...

5% of it is nitro...

10% of it is oil...

...therefore 85% of the given amount is base fuel IE:methanol.


So your example of 128 ozs.

7 ozs nitro
13 ozs oil
108 ozs methanol

...and bingo, 128ozs of 5% with a 10% oil content.....hmmmm....sounds like radial fuel

cymaz

I use a regular fuel with known oil and nitro contents. 16% nitro and 18% oil, cut 50/50 with methanol. This gives me 8% nitro and 9% oil, simples...oh and my 7-77 loves it

It is simple to mix and very little maths too!
Xoar 20x10

Dad_Roman

Very true!!! You also get the advantages of any of those nice additives they may have put in.

slskn

My Feedback: (4)

thanks for the info guys, I am having no luck yet with the availability of the nitro, still looking, is it possible to run these engines on just methanol and oil blend reliably? if so I will forgo the nitro, maybe give it a try? so if you just go with the oil content, it still would be 10% only of the 120 oz? another words 10 oz. of oil plus 118 oz of methanol? right?

Orion09

My Feedback: (1)

I was running 0 nitro and the engine ran just fine. But I found its simpler just to cut a jug of 15% with methanol. Heres a screen shot of the math. You can plug in your own numbers. Belated thanks to Ross. It works great.

Dad_Roman

Drag racers do Nitro....

0% nitro wont hurt but I cant comment on it....never done that.

Your math is way off. 10% of 120 is 12.......12 off of 120 is 108......so 10 % oil will be 12 ozs of oil in 108 ozs of methanol.

The numbers you put up would be 8.4%

slskn

My Feedback: (4)

Ok thanks for the info just wanted to make sure, if I go with no nitro I wanted the mixture to be right, I miss spoke the figure should have been 10% of 128 oz. Not 120, sorry, oh BTW found some nitro on amazon.com, sold by Torco.