I think that the LA 46 would be your best bet.  That much wing would be a struggle for the B-40.
  If you want the 4-2-4 type run, you might try putting in a couple of head gaskets and running an oil rich fuel mixture.  nother choice would be a Lew Woolard modified Fox 40 (silver Foxx).  They can be had cheaper than the $200+  (I think)

  Bigiron

Hi all,
Need some help choosing a motor for a Brodak United Kit I'm about to start. 54" wingspan 630 sq.in.  I would like to give the b40 a try to get a more traditional stunt run, but not sure that its powerful enough.  Really I'm looking for a nice 2-4 break, but i know that a la46 will power it nice, cheap and reliably. Im inclined to use an la 46 because the two I have are easy starting and solid as a rock. I also enjoy the remote nv. Is it true that these engines have the same bolt pattern and approximate length? That would be a pleasant surprise - get a b40 and if its not enough, just swap in a la. Any suggestions? Id also be open to other suggestions. I really don't want to spend too much either. My flying doesn't quite justify a $250 custom stunt engine. Thanks!

Enya 40SS
Enya 40 XZS
Enya 45SS
OS 40 LA
OS 46 LA
ST 51
Magnum 52
Enya 50SS
Saito 40

These are just a few more

 Marvin is right about the Silver foxx .40.
 Also the Enya 40 xzs would work well, I have a couple
 and they are powerful , smooth and usually a one
 flip start.

low engine rpm - strong vertical drive, constant speed, strong 4 stroke classic sound. ( Classic sound my .61 in a deep 4stroke sounds very impressive from outside the circle - I think this presents better than say a 36 or 40 on a pipe - Classic ships with pipes fly just as well, but I dont think present as nicely acoustically from a classic perpective ( IMHO )

Im looking for :mainly slow lap speeds with constant drive and power on tap. -

Flying in any conditions other than perfect or slight breeze with a classic design is alot harder to maintain consistant shape production. Strong wind especially. I want to be able to maintain a low lap speed and no speed difference - something the classic ships require.

With a modern design flying in wind is alot easier so less is dependant on the engine setup to help acheive this.


Again to answer the original question : I think LA 46 Will suit you down to the ground.

low engine rpm - strong vertical drive, constant speed, strong 4 stroke classic sound. ( Classic sound my .61 in a deep 4stroke sounds very impressive from outside the circle - I think this presents better than say a 36 or 40 on a pipe - Classic ships with pipes fly just as well, but I dont think present as nicely acoustically from a classic perpective ( IMHO )
Im looking for :mainly slow lap speeds with constant drive and power on tap. -
Flying in any conditions other than perfect or slight breeze with a classic design is alot harder to maintain consistant shape production. Strong wind especially. I want to be able to maintain a low lap speed and no speed difference - something the classic ships require.

So what are the slowest reliable lap speeds you have been able to get with your setup.  About the best I have been able to do is 5.3.  On ocassion when it is dead calm I will open up the needle to a solid four run of about 5.6 laps, that is a blast to fly patterns that slow.  Would love to have a set-up that can handle that all the time.  I did read once about an expert flyer at the Nats with a setup running 5.9 laps.  I could get use to that..

Hi Chris,

Since you have a couple OS .46LA, you are use to them, and can get them to run right, I would go with them.

If it isn't a "porker", the Brodak .40 would probably fly it fine.  Bob Lampione used a Fox. 35 in the original!  (but these days, "more is better")

I'm kinda surprised no one mentioned an Aero Tiger .36......

Big Bear

Thanks for all the replies - I have some thinking to do.

If Randy has one PA40 ul  re would work real well