Being from the old school of McCoys Vecos K&B and Fox engines I am seeing that the newer engines are more powerful with less displacement.
I saw a .25 in a modern engine would be better than a McCoy 35.
I would like to know if this is true I have a big box full of the old engines and if the smaller displacement engines are as powerful hoping to get some new ones

Modern Schnerule porting makes the newer engines much more powerful but there is no reason to discard older decent running engines. I enjoy my old baffle port engines because they are different.

RC engine technology has advanced greatly... especially in the last 30yrs. Although each engine you mentioned were definately all contenders for most powerful of thier day.. they probably don't hold a candle to alot of todays engines. Some might come close.. but I do believe in the overall scheme of things.. and all things considered.. IE power, durability, reliability, ease of operation.... the new generation engines will far exceed an old classic.

Not saying the old engines are any sort of slouch.. not at all.. and if in good condition with an experienced hand.. just might still give years of service.. Most of todays engines though are far lighter, have more power, and are generally more efficient.. There are obviously a few outstanding brands today.. OS being the go-to for many people.. There's Saito, Magnum, Thundertiger, ASP, etc.. many many decent brands to choose from.

Also, when you say "smaller" displacement engines... there is more and more power in smaller and smaller packages every year. A good running OS.46AX has as much, or more power then a K&B, or Veco .61 did 30yrs ago, and its smaller and lighter..

So.. if you're into nostalgia, and like classic engines(I definately do in some cases).. then go through your box and weed out your favorites.. If you are all about power and getting the job done with a current fresh engine.. then there will probably be collectors, or otherwise that would be interested in what you've got... Just shop shop shop.. study up .. and have fun learing.. its a great hobby. I wish you well.

I have a Webra "Speed .61" that back in the day was the go to engine for power and reliability. It is of the modern Schnerule ported design. Today many if not all the 55 engines will meet or exceed the old Webra for power.

Ken

You said Schnerule, heh, heh, heh, heh

The thing I noticed was that the .45 to .50 size planes are as large as the .60 size planes from the past. Our .40 size planes from the past were smaller then. That was when the .40 and .60 size non-Schneurle engines were around. Nowadays the .60 size planes are huge in comparison to the old .60 size planes from the past.

The Schneurle ported engines are quite a bit more powerful than the old baffled piston engines from the past. The airplanes grew in size to compensate for it too.

But if you are careful in your airplane choices the old baffled piston engines can be quite useful and still run and fly really good anyway.

The older engines are better at lugging large props, while the modern ABC engines are better at higher revs and therefore need a lower prop load. This means higher power in terms of Hp for the modern engines, but depending on the plane and style of flying the older engines will do very well to.

Starting in the 2000's some of the engine manufacturers were tuning the Schnuerle engines so that the engines would turn larger props and handle more restrictive (more quiet) mufflers in a effort to reduce overall engine noise.

I think in the late 1980's and early 1990's the Schnuerle engines reached their peak as to performance. The earlier engines would turn higher RPMs whereas the later engines were setup to turn larger props. The engines haven't really changed any for performance since then. Of course the driving factor was pattern flying of that time, where competitors wanted to use retracts and tuned pipes to get the most power and speed to perform the aerobatic maneuvers. That changed when the Las Vegas style Tournament of Champions events started happening and the planes quickly got much larger as well. Landing and takeoff points changed too, so people started using tail dragger planes instead of retracts on tricycle gear setups.

In addition to the well-documented power increase of modern Schnürle ported engines, compared to their baffle-piston counterparts of years gone by; it seems the power required today is much greater than it was then...

Then, people used to fly planes on the wing, with the engine providing power for forward motivation.
Today, most newer fliers consider a model that cannot pull itself vertically up; under-powered...

Nearly all of today's trainers can climb vertically on the .46 in their nose; but in reality, they don't need more than a .25 for safe flight and for realistic, full-scale like flight, a .15-.20 will also suffice.

Dar said Schnürle Heh, heh, heh, heh

Originally Posted by jeffie8696

You said Schnerule, heh, heh, heh, heh

Originally Posted by jeffie8696

Dar said Schnürle Heh, heh, heh, heh

You havin' a flashback of the times when Beavis and Butthead still were considered funny?

Brgds, Bert

Originally Posted by DarZeelon

In addition to the well-documented power increase of modern Schnürle ported engines, compared to their baffle-piston counterparts of years gone by; it seems the power required today is much greater than it was then...

Then, people used to fly planes on the wing, with the engine providing power for forward motivation.
Today, most newer fliers consider a model that cannot pull itself vertically up; under-powered...

Nearly all of today's trainers can climb vertically on the .46 in their nose; but in reality, they don't need more than a .25 for safe flight and for realistic, full-scale like flight, a .15-.20 will also suffice.

This I agree with !
We all have to fly in the prop now !
The old cadets come to mind flying so slow they would stand still in a good head wind
Let go of the sticks and it would self right with out a gyro or whatever is in our new trainers
Man I sound old now

Originally Posted by DarZeelon

In addition to the well-documented power increase of modern Schnürle ported engines, compared to their baffle-piston counterparts of years gone by; it seems the power required today is much greater than it was then...

Then, people used to fly planes on the wing, with the engine providing power for forward motivation.
Today, most newer fliers consider a model that cannot pull itself vertically up; under-powered...

Nearly all of today's trainers can climb vertically on the .46 in their nose; but in reality, they don't need more than a .25 for safe flight and for realistic, full-scale like flight, a .15-.20 will also suffice.

This I agree with !
We all have to fly in the prop now !
The old cadets come to mind flying so slow they would stand still in a good head wind
Let go of the sticks and it would self right with out a gyro or whatever is in our new trainers
Man I sound old now