I have a few short kits that I will be building soon

I have the following: ATLAS, BANSHEE, CURARE and DIRTY BIRDY and have been looking at the following engines.

Looking at the OS 55AX, 65AX, 75AX and a JETT 60l or 90L, Looking for the best matchbe built just for not to compete

Ron

Hi,

Does it have to be a new engine ?
Otherwise you could just aswell buy an old type/style (used or NIB on the ussual sites) Webra or O.S. or Y.S wich ussually fit these older styles better.
I`m personally not such a big fan of the huge engines in these planes like the 75 or 90 with a good 60 and a pipe these planes have all the power they need and even a bit extra
so i don`t really see why one would put a big engine on the nose, but then again that`s just my opinion for what it`s worth


Erik

I generally agree with Erik but if you need to choose from those engines I'd put a 55 AX into the DB and Atlas if built light. The Curare and Banshee, if built with foam cores and retracts could stand a slightly larger engine like the 65AX. 75's and 90's are overkill IMO but you could go with a Jett 90 or 100 on something like an EU-1A or other large model.

David.

Hi,

The Atlas and Curare were both designed for the Austrian-made Webra Speed 61 which was made from 1973 right up to last year when Webra went out of business.

However, it appears that an engine closely reated to the Webra Speed 61 is still available: [link=http://www.mecoa.com/]Model Engine Company of America (MECOA)[/link] make the formerly Austrian-made [link=http://www.mecoa.com/hp/index.htm]Hirtenberger Patronen (HP)[/link] engines, among them the [link=http://www.mecoa.com/hp/61/2203.htm]HP61 Gold Cup[/link] and [link=http://www.mecoa.com/hp/rcss.htm]HP61 Silver Star[/link].

The HP61 Gold Cup is available in either ringed or ABC versions from MECOA's online shop; the Silver Star is available ringed only. Both come with a silencer (muffler to you transatlantic fellows). The Gold Cup, besides the blue colour and gold-anodised head, has a machined and anodised head and a slide-type carburettor.

According to the 1974 Peter Chinn test of the Webra Speed 61 in the British magazine Radio Control Models and Electronics (attached), the Webra Speed 61 was designed by one Peter Billes, who was previously involved in the development of the original (pre-Silver Star, pre-Gold Cup) HP61, said to be the world's first Schnuerle-ported RC glow engine.

Appearance and specifications of the Webra Speed 61 and the HP61 Gold Cup and Silver Star are quite close so they are a natural fit for a Curare or Atlas. If I were shopping for a new engine for a Curare or Atlas (the two designs on my building list fr my return to pattern) I'd definitely be ordering one of the two HP engines, probably the Gold Cup. As it is, I have two Webra Speed 61's, a recent one I ordered from the local distributor here, coincidentally just before Webra went out of business, and a 1977 one I found new-in-box on the well known auction site.

I haven't tried MECOA's products yet, so I can't comment on the product quality or customer service. But I have just ordered a silencer for my 1977 Webra Speed 61 from them and the USPS tracking website says it's on its way. Their HP parts page says "No parts fit Webra" but I read somewhere here on RCU that the strap-on silencer MECOA offer for the old style HP61's will also fit the old-style Webra Speed 61 (the later versions of both engines take bolt-on silencers). I hope that was correct, and that the silencer will be satisfactory.

Best regards,

George

As gkaraolides wrote Peter Billes designed the Webra after the HP. I always figured this gave him an opportunity to fix any issues he had with the HP. They are both outstanding engines some of my favorites.

If you do need a strap on muffler BCM does offer them. The work great on all the engines I have tried them on. Later both HP and Webra offered bolt on version that used the same bolt pattern as the OS #744 muffler.

turbo

I have both 2 HP`s and 4 webra 61 speeds but the webra`s definitely have a bit more power then the HP`s allthough the HP`s run just as smooth and reliable as the webra they lack a bit in top end power .
The HP`s i have are the old ones though not the ones from mecoa so maybe the newer ones have a bit more power i don`t know that .

Erik

Hi turbo,

So I suppose what you are saying is that:

- The [link=http://www.bissonmufflers.com/en/muffler.html?mufflers::listing_id=113965]BCM #161 60/80 Strap On muffler[/link] fits the early versions of both the HP61 and the Webra Speed 61.

- The [link=http://www.bissonmufflers.com/en/muffler.html?mufflers::listing_id=114047]BCM #4062 bolt on muffler for the OS .61-.65 SF/FX/AX Sport[/link] (which I think would make that the BCM equivalent of the OS #744) will fit the later bolt-on versions of both engines.

It would be very good if this is true. Can you confirm this from your own experience?

Best regards,

George

Hi Erik,

Which HP61 do you have? The early HP61, the Gold Cup or the Silver Star?

Best regards,

George

George,

The OS 61 FSR used the #744 it was a bolt-to. This is the one that works with my later model HP 61 Gold Cup and Webra 61 Speed ( #1024). The OS 61 SF used the #744B muffler. It is the bolt-thru pattern on the SF. They are a different pattern some of the first OS 61 SF's had the muffler with both sets of holes so it would fit both the 61 FSR or 61 SF. I don't have any experience with the FX / AX and don't know.

I have used the BCM #161 and #162 mufflers. I like the #162 low DB the best. The extra volume seems to more than make up for the quieter sound. It is a great situation if you need to be quiet. I have been very happy with any of the BCM sport muffler applications I have tried.

turbo

Hi George

I have the early HP61 both of them with a perry carburator

Erik

Hi Erik,

You have a pair of very nice and historically significant engines!

MECOA make the later HP61 Silver Star and Gold Cup.

My guess is these are likely to have about the same power as a Webra Speed 61. Also, the Gold Cup is available in an ABC version which is likely to release a little more power still, especially at the top end. To the best of my knowledge, the Webra Speed 61 hadn't been available in an ABC version for quite some time when production ended in 2010 with ringed versions only.

Perhaps someone who has used the MECOA HP61 can give us the benefit of some direct experience.

Best regards,

George

Hi turbo,

Thanks for the TIP on the BCM #161 AND #162 strap-on silencers. I am sure they will be great for my earlier Webra Speed 61. If I get any noise complaints I will try the #162 low dB, but both fields local to me also host jet fliers so somehow I don't think my pattern planes will be the loudest there...

It's clear that a bolt-on silencer is needed for the later Webra Speed 61 and HP 61. If the BCM #4062 is a bolt-through then it definitely won't work. Thanks for the heads-up.

Best regards,

George