Theres about three LA 46s there now .Ones ive seen handle 55 inch / 50 Oz planes no sweat .
However , extropolateing , a M A artical had Werwage try a HP front on a FSR OS 45 , stated he thought the smaller shaft limited the output . Tho was a 8 Oz motor so saved near 3 .
BUT the RPR rear induction suffers no such qualms . Profile youd likely need a inboard tank . Mine had the liner dropped 36 thou or the 0.7 mm , std stunt mod. 0.8 on the gold cup .
THEY SAY . but you need to check the deck high Vs. piston Posn. at max tdc before S P I appears . Look across from tansfer & or shine a flashlight up it , to see limit .
Measure & faff about . But youll find .7 mm , , or 36 1/2 thou. is about it , then + that on the head gasket . The RPR is something like O 40 C 60 on a less restricted intake passage .
Mine ran 1/4 bore venturie . Nylon . I think a 3.5 mm MVVS 15 spray bar . The later thickened end needle one .( like a S Tigre almost )
a 11 x 5 Master Prop , or in hurricanes a 11 x 4 Tornado , or my custom wonder prop . 57 Span 57 / 60 Oz ( muffled ).
The plane liked 65 Ft on .016 solids . A memorable flight at dusk off a beach , its third . Just enough breeze to keep it moving through the pattern on a low power setting .
( New motor , stale dregs of no nitro fuel , touchy needle , conservative setting . )
However its regularly coped with 20 knot steady & gusty air . And Ive now FOUR ready to assemble. Total . Shaving the case aint a good idea . To short an Ex screw thread .
Was donated the pieces to do one front intake , but Ive not tried that . RPR gives good load response so it keeps a steady airspeed . Almost telepathic in its efforts .
SO , we think the HP maybe will pull a bigger plane . Some cooked rings in hot weather , so a tongue muffler might not be a good idea for longivity .
For Noblerish size / weight devises the LA 46 will give noble service . Samuri Blood ? . Theyve no bypass port . If the 40 has , blocking it might get it as dependable .
Seems like FP 40s , opinions vary , on the 40s . One in the 60 + Oz mewgull on I think a 12 x 4 was pretty good tho . Maybe a bit less pitch & more rpm on the OS's
for heavier planes . Now how does that sound familiar .
The ABC OS's are maybe ? less likely to get upset running a fair dose of nitro , too . So really maybe theres nothing in it .
Differant coloured Horses . Dunno if that effects things or not
Tho your ABC HPs wont burn up , running Nitro , Either . Try a 12 x 4 prop , maybe trim to 11 1/2 or 11 . so a ' E W ' find the load its happy at . Dont think 6 in pitch is it , with them .