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Hirth f23 problems

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Hirth F-23 on gyrobee

Previous 1 2 template Next. Hirth F23 50 hp 26th August Does anyone have experience of using one of these? I'm interested in operating temperatures because I've heard that there can be a problem with CHTs. The engine will be premix rather than oil injection - I've never operated a two stroke and wonder what recommendations will be made about oils.

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Tags: None. Steve Uzochukwu. Comment Post Cancel. Adrian Jones. He is now importing Hirth engines and has lots of experience of two strokes in general. I would go with Steve's advice about oil. You should go for a good quality, low deposit, semi-synthetic. Fully synthetic is unnecessary and will absorb more moisture if the engine is layed up, which will affect bearing surfaces.

Hirth F23 50 hp Thanks chaps. It's the carb version Steve. Hirth F23 50 hp Steve - probably worth looking round the internet for sources. AM price.

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Will continue my researches. Hirth F23 50 hp Try rockoil.Remember Me? Advanced Search. Results 1 to 7 of 7. Thread: Hirth F Thread Tools Show Printable Version.

Hirth F33 Greetings, I am researching UL's, planning to purchase one, have considered three or four so far. My problem is, the BYf probably my favorite so farhas a waiting period of a year or more, plus the cost is more than i like. It has the 4 stroke which i would really prefer.

Second is the Belite, however if you choose the 4 stroke, it jumps the price up to around 32k, up from around 17 with a 2 stroke. A Challenger is another choice, however there we go with the 2 stroke. My question, does anyone have first hand experience with a F33?

I read that TBO is around a hours, compared to on a Rotaxplus i've read that all 2 strokes are prone to stop running, especially during idle. So far the F33 would be my 1st choice in a 2 stroke, should i go that way 2 strokejust would like any and all information on these engines, the good and bad of them.

Thanks in advance, Jim. Jim, if you go in with the expectation that the Hirth engine will last h, you sure to be disappointed. Unless they offer some kind of unlimited warranty for that time, it's just a number. Hey Jim. Are you talking about a true ultralight or lightsport?

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If you meant ultralight, Challenger's are far too fast and heavy. There are very few pound or less true ultralights. The lightest Challenger will weigh well past pounds. Don't count out 2 strokes.

It never let me down. It was overhauled by an authorized Rotax facility with over hours at 15 years old. The mechanic said it looked like a hour engine inside. The crankshaft was in perfect shape so it was reused. He only did a top end and replaced the seals. At hours it still had good compression and ran as good as new.

hirth f23 problems

The new owner wanted to have it rebuilt for his peace of mind, not because of any problems. In my opinion, a Rotaxor blue head is as reliable as anything out there if it's maintained properly.

They don't just stop running any more any other engine stops running.Light Sport Aircraft Store P. Click here for Google Map driving directions to Airfield. Ultralight News. Aerial photography - Digital aerial photography - over 40 years experience!

Our monthly newsletter packed full of information about ultralight aviation! If you have high speed internet and Windows Media Player installed you can watch our weekly Light Sport and Ultralight aircraft webcast! Each issue is 25 to 35 minutes in length and is live on the web for 7 days. Click here for more information! A number of ultralight aircraft manufacturers have started to build part legal ultralight again. With all the attention that the light sport category has gotten little if any changes have taken place with respect to increasing weights for ultralights.

So other ways have had to be found to build a legal part ultralight. Recreational Power the U. Hirth Aircraft engine distributor has been working with the factory, and has put their twin cylinder opposed F engine, which has been on the market for over 20 years on a weight reduction program. Hirth has redesigned the engine with a lighter crankshaft, and reduction drive, switched to a pull starter with a decompression system, which has reduced the weight for a 50 HP engine to 71 lbs.

Note the older version of the engine is still available, the newer engine has a UL designation. This is 5 lbs heavier than a single cylinder Rotax which put out only 28 HP. The engine comes standard with dual carbs, dual ignition, and a 20 amp charging system. It has a 1 year total warranty and a 3 year pro rated warranty. Top end TBO is hours with engine rebuild at 1, hours.

Hirth F23 twin cylinder oppose ultralight aircraft engine from Recreational Power.

hirth f23 problems

The World's first Lightsport and Ultralight Aircraft weekly web video webcast! You may link to these pages or print them out for your own personal use. Email Use this box to search our sites or the web!

Web LightSportAircraft. Light Sport Aircraft Pilot. Click here for this months specials! The decompression system works automatically on start up via a compression bi-pass system. Raven Trikes will be one of the first manufacturers to use the engine on the part legal trikes. Distributor-Hirth Aircraft Engines E. Light Sport Aircraft Main Index. Make yourself visible to others when your flyingPosted By: redback June 24, Fuel injected? Hirth Engine? I had never even heard of a Hirth.

It was smoother, had more power, cruised at lower rpms and weighed less than the I was so impressed I decided then and there to get involved with marketing Hirth. Here was a tremendous engine available to us and nobody knew about it.

The Hirth engine has a history dating back tofirst making gears and then crankshafts.

Considering The Hirth Engine

Some of the Luftwaffe had Hirth four-cycle aircraft engines. It was then that Hirth was bought out by Gobler the company is now called Gobler-Hirthmotoren. Gobler, the new owner, made the decision to combine what Hirth learned from its aircraft days with what it had learned in the two-cycle industry for the express purpose of building two-cycle aircraft engines.

Dandar admits that the Hirth engine has had a slow start breaking into the rotorcraft market. The engine was available only in a free air-cooled version.

It was primarily designed to be used in tractor prop aircraft where the propeller cools it. Without the benefit of fan cooling, it was just a matter of time before it overheated and burned the engine up when it was used in a pusher configuration. Hirth developed fan cooling for the F 4 years ago. Dandar says the Hirth engine produced today is not the Hirth engine of a decade ago.

The Hirth has gone through many, many changes. They are not mass-produced. This is why a Hirth engine runs so much smoother than most two-cycles on the market.

All these components are expensive But well worth the cost for better reliability and longevity. Nikasil cylinders, according to Dandar, eliminate the need for water-cooling, thus increasing reliability and reducing weight. The special piston porting and combustion chamber on the Hirth are designed for a linear torque curve with more torque in the mid-range than is normally found in two cycle — resulting in a lower cruise rpm. Most two-cycles are designed to be used with some sort of centrifugal clutch.First, the background vibes on the current crop of engines.

They are good engines. Each has positives and negatives. It is what I refer to as a stump-puller. It has incredible low end torque and is ideal for ultralights with a lot of drag and a need for acceleration and power. It yanks our Belite Sealite floatplane out of the water, even in hot and high and calm conditions.

It makes runway length an optional requirement. It is reliable; it is available with electric start, fuel and oil injection, and it is a great value for the money. And it uses a lot of gas think a mininum of 3. They are heavy, and ultralight customers fight the tradeoff between weight, legal FAR part operations, and the classic boxer look which these engines share the Hirth F They are a great choice if you are comfortable with the weight and can stand a little longer takeoff roll.

Any early Disney theme park fans in reader-land??? The MZ is economical; relatively smooth running; and a jolt in the butt when you hit the throttle.

hirth f23 problems

Leave them alone. Let them be. The wish list would be this:. No startups, sorry. Like a 4 cylinder GA engine. Or 2 hours with a 30 minute reserve, to be a little more conservative. I found that engine. I was at the Aero-Expo in Friedrichshafen Germany, wandering around the exhibits of the various companies. I walked by a booth and was stopped by a row of engines which looked like they were the right size to be ultralight aircraft engines. One in particular caught my eye: it had dual ignition, a water jacket over the cylinder water cooled!

The indicated weight was less than 50 pounds! And it had an internally counterbalance shaft, for smooth running! After a few months of reflection, I ordered one of the engines as a big test.

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Would the weight indications be accurate? Would the horsepower be real? It had been packed into a shipping box, whilst mounted on a steel frame. The engine installation was straight forward; a few weeks later, we had it installed on our ProCub Lite demonstrator airplane. One day while I was hanging around at the shop, I decided to test the strength of our Polini motor mount by resting nearly pounds of engine and human blubber on the mount.

I formally documented the results in the following picture:.

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And I should note a few things about the process of getting the engine mounted on our airplane. Machined aluminum standoffs were included, along with rubber bushings.

We just bolted those to our engine mount. You can see them in one of the photos. And change your bushings out every year, when you annual your airplane. The electrical harness came with the engine.Remember Me? Advanced Search. Results 1 to 7 of 7. Thread: Hirth F Thread Tools Show Printable Version. Hirth F33 Greetings, I am researching UL's, planning to purchase one, have considered three or four so far.

My problem is, the BYf probably my favorite so farhas a waiting period of a year or more, plus the cost is more than i like. It has the 4 stroke which i would really prefer. Second is the Belite, however if you choose the 4 stroke, it jumps the price up to around 32k, up from around 17 with a 2 stroke. A Challenger is another choice, however there we go with the 2 stroke. My question, does anyone have first hand experience with a F33?

I read that TBO is around a hours, compared to on a Rotaxplus i've read that all 2 strokes are prone to stop running, especially during idle. So far the F33 would be my 1st choice in a 2 stroke, should i go that way 2 strokejust would like any and all information on these engines, the good and bad of them.

Thanks in advance, Jim. Jim, if you go in with the expectation that the Hirth engine will last h, you sure to be disappointed. Unless they offer some kind of unlimited warranty for that time, it's just a number. Hey Jim. Are you talking about a true ultralight or lightsport?

If you meant ultralight, Challenger's are far too fast and heavy. There are very few pound or less true ultralights. The lightest Challenger will weigh well past pounds. Don't count out 2 strokes. It never let me down. It was overhauled by an authorized Rotax facility with over hours at 15 years old. The mechanic said it looked like a hour engine inside.

The crankshaft was in perfect shape so it was reused. He only did a top end and replaced the seals. At hours it still had good compression and ran as good as new.

The new owner wanted to have it rebuilt for his peace of mind, not because of any problems. In my opinion, a Rotaxor blue head is as reliable as anything out there if it's maintained properly. They don't just stop running any more any other engine stops running. I'd personally stay with Rotax.

They're well proven to be very reliable. I haven't had any personal experience with Hirth but what I've heard and read was not good, long term. Don't let the advertised TBO fool you. Something to think about, if you're going lightsport, think about going with one of the old classics. Those old Continental's are super-reliable and you can train in your own airplane which will save you a bunch.Forums New posts Search forums.

What's new New posts New profile posts Latest activity. Members Current visitors New profile posts Search profile posts. Log in Register. Search titles only. Search Advanced search…. New posts. Search forums. Log in. For a better experience, please enable JavaScript in your browser before proceeding. Hirth F on gyrobee.

Thread starter gm Start date Feb 16, Has anyone put a Hirth F on a gyrobee? Seems like a nice engine for the weight.

I can't tell if the gearbox redrive can be mounted upside down so its similar to the rotax setup. Any comments? Thanks Don B. MikeBoyette Gold Member. Don, Friends don't let friends fly Hirths.

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Hirths are not very reliable stay with Rotax. Poo Poo! Me likes Hirth! Me thinks me is gonna power my Dominator with Hirth! I was wondering about the F It has a belt re-drive and no fan to keep cool for a pusher application.

This makes me worry. I think you'd be happier with the or it's replacement the But hey, that's just my 2 cents. I've never owned a hirth, so I don't know. But I know Scott, and he loves his.

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John, Thanks an answer with an actual fact! I had not really given much thought to the cooling. The seems like a contender along with the MZ I forget the actual numbers, but it works great. However, Brent recommends, and it's a common recommendation, that any reduction unit you get for any engine should be geared. The MZ, like Hirth, offer a belt drive for less money. Stay away from this and pay a little extra to get the gear drive.

Unfortunately, the belt snapped while in flight forcing Ron to land.

hirth f23 problems