Suggest a Sport .35 engine?

Can someone can suggest a new sport .35 engine. And maybe a source.
Good engine for a fair price.

Thanks
Paul

For Sport use, on planes that would have been designed for something like a Fox 35 or similar baffle .35 there are a couple of choices.

Fox stunts are available quite regularly on the online auctions and swap meets. Same with the OS max 35 and 35 S engines.

more modern Schnuerle ported engines are also available but not in current production--like the OS 35 FP and 20 and 25 FP. Bothe of these smaller engines is a good match for something like a ringmaster, flightstreak, skyray or similar small profile--plenty of power and very smooth like a watch. (and available for 30-50 bucks)

THe 35 FP is alot more power and weight than the Fox 35.

In current production, the OS LA 25 is a newer version. Also the thunder tiger and Magnum 25 are near knock-offs of the OS engines.

All of these smaller engines will provide as much or more effective power than the Fox but will need to be run in a constant 2 cycle mode with a smaller prop. THey are also designed to be used with a muffler with out the power penalty you might pay for similar sound levels from the earlier engines.

There are more but the above will be readily available and easy to work with.

Hope this helps some.

The Brodak 40 is a great light engine with easy set up and nice power for the 500-550 sq classic planes ect.

You chose a target that has MOVED. Only the Fox stunt 35 stayed the same. Everything else that once met that definition disappeared, and the OS of today is a different creature than the OS of yesteryear. The pricing changed seriously also. Check around the net for Fox pricing; I think someone in the garage distribution of CL stuff discounts new ones pretty well, but not sure. I have enough new and used Foxes I would have a tough time using them all up in the time I believe is left to me.

Look at Curt's answer for some details (I'll add a few comments):

> For Sport use, on planes that would have been designed for something like a Fox 35 or
> similar baffle .35 there are a couple of choices. Fox stunts are available quite
> regularly on the online auctions and swap meets. Same with the OS max 35 and 35 S
> engines.

Fairly often the eBay Foxes are almost new and only get bid up to a nice low "used" price.

> More modern Schnuerle ported engines are also available but not in current production--
> like the OS 35 FP

I don't include that one in MY definition of "Sport 35", since it has the power of a baffle 45.

> and 20 and 25 FP. Both of these smaller engines is a good match for something like a
> Ringmaster, Flight Streak, Skyray or similar small profile--plenty of power and very
> smooth like a watch. (and available for 30-50 bucks)

Pricing on a used FP 20/25 varies all over the ballpark; very few NIB ones come through at particularly economical auction totals. And of the used ones, some are "used up".

> THe 35 FP is a lot more power and weight than the Fox 35.

> In current production, the OS LA 25 is a newer version. Also the Thunder Tiger and
> Magnum 25 are near knock-offs of the OS engines.

The original Magnums were clones of the FP's (in the GP Model), and of the SF's in the XL's. Today's Magnums are clones of the FX's.

> All of these smaller engines will provide as much or more effective power than the Fox
> but will need to be run in a constant 2 cycle mode with a smaller prop. THey are also
> designed to be used with a muffler with out the power penalty you might pay for similar
> sound levels from the earlier engines.

.

Kiwi

LAST EDITED ON May-15-04 AT 02:24 PM (CDT)
 
Ron B.
F4Fguy

Paul:

All the above sugestions are fine.I'd add some of the clones of O.S.such as Magnum,and Tower's 35s and 40s.and don't overlook the reworkers like Tom Lay,Randy Smith,Lew Woolard,Tom Muggleton,and others I can't remember at the moment.the cost may be marginally higher,but you'll have a Fox(or anything else they've done)which will outlast and outperform the stock Fox,by a heap.

Also,for strictly sport flying,don't be afraid to try any of the R.C.engines in your size range.Some are on the heavy side,but they are easy handling,and generally have good power.Given their market they have to have reliability in the hands of people who regard the engine as a throwaway tool.All you have to do is lock the throttle wide open and go fly.In our summer Young Aviators Academy,we used MDS18s one year when we cuouldn't get Norvell 15s(Which also are good).Except for having too much power for the 15 sized P-51,they were very nice engines.

You Might take a look at the new Norvel 40.If its as good as the smaller one it could suit your needs very well.

I don't have anything for you Paul but I've got a blackhead McCoy 35, (series 21) for the "Prop Buster". I'll send it to you when I get a chance, If we're gonna argue price forget about it.

Paul:
It is my understanding that the Double Star 40 was designed as a direct replacement for the Fox .35. The Brodak .40 has also been touted as a good substitute for the Fox .35. And, of course, the Fox .35 is still readily available new and used. As between the two, however, and based on opinions expressed by other in this forum, the Brodak .40 seems to get the nod by virtue of price, workmanship, and performance.
I recommend the Thunder Tiger .25 GP as prepared by our host, Leonard, as a very good substitute for the Fox .35. I have used mine on a Ukey 35 and a Skyray 35, both of which have also been flown on a tricked-out Fox .35. The TT .25 GP handles both with at least the same authority as the Fox .35. In addition, my TT .25 is very user friendly: it starts easily by hand, and it responds well to and holds needle valve settings. I have good luck with a variety of 9x4 wooden props and with a 10x4 Zinger cut down to 9.5 inches. I cannot, however, venture an opinion on how it compares with the Magnum or O.S. LAs of the same size, although I guess they are pretty much the same.

One thing that you have to be cautious of when buying an asian rim (OS,Thundertigre, Magnum) engine is compression. If you buy a used a.r. engine from anyone(or ebay) be aware that they can sometimes have excellent compression cold, and none when warm. If your used engine is like this, then it is worn out and needs a new piston and cylinder.

Rule of the thumb: If you are looking at a used asian rim engine to buy, and the piston's color is black, don't buy it.

I have flown only sport since getting back into control line about a year ago. My first "new" engine was an L&J Fox 35 from RSM. It is everything the original Fox was not: simple break-in, smooth, and powerful. Great instructions from Larry Foster and if you ever need help, he is easy to contact. It is a little more expensive than an LA 25, but is truly ready to use when break-in is complete. So far, mine has been on a Ringmaster, a Ukey 35, and an ARF Nobler. Near perfect powerplant for each.
Steve
The older I get, the better I used to fly!