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ronny

O-235 vs O-320

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Weight is an issue with all planes, aspecially the canards carrying this heavy lump in the back.

 

An O-320 weighs about 30LB's (13.6kg) more than a O-235

 

Would it be possible to lighten a O-320 to the weight of a O-235. I.e. put it on a 15 kg diet.

 

Aren''t there parts, brackets and other stuff such ass covers that can be produced from light materal such as carbon fiber of titanium.

 

Thanks

Ronny

:D :D :D :D

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Weight is an issue with all planes, aspecially the canards carrying this heavy lump in the back.

 

An O-320 weighs about 30LB's (13.6kg) more than a O-235

 

Would it be possible to lighten a O-320 to the weight of a O-235. I.e. put it on a 15 kg diet.

 

Aren''t there parts, brackets and other stuff such ass covers that can be produced from light materal such as carbon fiber of titanium.

 

Thanks

Ronny

:D :D :D :D

not much that you could change on the engine itself. the parts that are removable only weigh about 5 lbs. total so even if you cut the weight of these in half you will only save 2.5 lbs. you could leave off the starter, alternator and vacuum pump. the best thing is to use the light weight starter, alternator and and no vacuum pump or magnetos and use electronics. you are worrying about the weight in the wrong place. the extra HP of the 320 more then makes up for the extra weight. This has been proven by the many planes that have converted to the 320s and they fly great. so much better it would be foolish to build a long ez any other way. resale value can be up to double. On a varieze it makes a rocket. the other thing that most do not know is that the center of gravity on a 320 is closer to the accessory case then it is in the 235. even though it is heavier the CG moves forward with the 320 installed.

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I installed a 320 on my Long and enjoy the extra power. I typically see 175 mph on less than 7 gph and the rate of climb impresses the local pilots. If someone were to ask me if I was concerned about carrying an extra 30 pounds and 40 horsepower my answer would be obvious. I'll pass on the french fries and dessert.

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I've had one of each.

 

0-235 is Ok.

 

0-320... WAY BETTER!

 

Most of the 0-235's are almost as heavy as the 320's, so the extra HP makes a big difference with little wheight penalty.

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here in Italy there is a company called yo-yo elicopters that has carbon fiber valve cover for the 320.

try search on the net if you really can't live without that fancy stuff

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Very interesting to see that these carbon fiber cylinderhead covers have been produced.

 

Most likely I will install a O 320 on the Long EZ. But even then I also wanna save every poung/kg I can to make it even better.

 

Thanks for the link to the Italian company.

 

Regards

Ronny

:D :D :D :D

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The Longeze I built had an 0235 in it. It flew really nice solo. If I ever build another one it will have an 0320 in it. STeve

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What are the items to be considered when transplanting a O 320 into the EZ?

 

The engine mounting of course (by the way what s the difference between conical and dynafocal mounts ? which ones are used on the EZ?

 

But what are the other items of concern ? Cooling ? Oil cooling ?

 

Appreciate your comments

Thx

Ronny

:D :D :D :D

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Use larger extrusions for the engine mount.

 

the difference between conical and dynafocal is the way the engine mounts.

 

you will need to have the engine in hand before you order your mount as they are not interchangable.

 

You'll find the conical on older models.

 

no significant difference in accessories between 235 and 320.

 

Waiter

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conical mounts are just a tad lighter than the dynafocal. The rubber bushings for the dynafocal are a lot more $$$$ than the conical. Generally the conicals are older motors. My Long had Conicals and the Cozy IV I am presently building has conicals they are also easier to make yourself than the dynafocals. The dynafocals are supposed to have less vibration. This is all I know about the differences of the two mounts. STeve building on

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Vibrations is an issue isn t it.

 

Are there special engine mountings being used to dampen the engine vibrations?

 

I know from Waiters post that dynamic balancing of the prop is a major factor in reducing vibrations.

But based on my experience of engine vibratons in the industry, it is also important to use engine mountings that absorb vibrations.

 

These Dynafocal mounts, forgive me my stupid question, is "Dynafocal" just a type of mountings or is it one specific brand?

 

Ronny

:D :D :D :D

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The word "Dynafocal" comes from the phrase Dynamically Focused.

 

The angle of the motor mounts points toward the center of mass of the engine, and theroetically the focal point of any vibration.

 

Personally, I like the Conical better, the mount rubbers are cheaper, and unless you have labratory instrumentation connected, I seriously doubt you could detect any difference between the two styles.

 

The Conical mount is lighter and you'll have a little more room to work with around the firewall.

 

Waiter

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Very interesting to see that these carbon fiber cylinderhead covers have been produced.

 

Most likely I will install a O 320 on the Long EZ. But even then I also wanna save every poung/kg I can to make it even better.

 

Thanks for the link to the Italian company.

 

Regards

Ronny

:D :D :D :D

Hi Ronny I work with them, and they shaved of nearly 10kg of teh standard O-320

 

wolf.

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