Design > Stunt design
i build my first biplane
Michael Novobrantsev:
Hello !
Now i build my first biplane like biceps wingspan 47"
Chord without flaps is 8"
Engine in side position.
Now i am in choice betwenn engines :
MERCO 49 or ~> FOX 60 EAGLE I ?
weight of both engines is 350 -370 gramm
I know Merco is is good stunt engine , but his weight like Fox 60
I don t know about stunt experience of Fox Eagle I 60 .
Anybody have ideas ?
Thanks
Air Ministry .:
looks nice .
No experiance with the Fox Eagle , but a Merco 49 . With This intake . the Trumpet ish one . But the long lug case , single plug , & a 49 not a 61 . Tho Ive two 61s now , & no 49s . :-\ :-X :P
Incidently , theres two C'Case Intake bore diameters . Bored one of the 61s to the 1/2 bore Of the Trumpet intake .
The 49 was initially a bit tight , but loosened of & on the Fox Fuel , 27 % oil , 15 & 20 % Nitro , with stock head clearance , ran superbly . Even when you put a muffler on it . :-X o.k. I was out in the sticks .
The big heavy ugly Super Tigre Quite Muffler, it ran well . No power loss . tho snapped the puny 6 B.A. bolt aft , doing squares . :P Stock Head Clearance . Australia . Might be ' Nitro ' Comp Ratio for Here ? .
Windsor Wood 12 x 6 , thinned . on the 72 Oz 72 Span Mew Gull . tho'd be more with 4 Oz. muffler !
SO , think a GOOD Merco ( This was as new ) would be dependable & trouble free .
Had the tourque to hold a steady speed , even when it was blowing . Something Id think youd need . As theres a bit of frontal area having several wings & suchlike .
NEEDS GOOD COOLING FLOW , a decent intake area and free flowing cowl discharge . Mine was 7.5 mm intake bore. Will dig out the timing figures . they Vary .
Was a round hole to passage in crank , whereas the 61s I have are rectulinear . One 61 has a 1/4 prop thread/ shaft . & its shorter nosed than the usual 5/16 thread shaft .
I suppose a Merco Muffler would even fit . S?P Was much gruntier & steadier , rich , with the Nitro . So 10% might be the idea . Ran a steady ' top of ' the four stroke , puled uphill well .with the weight .
Good in the Squares , would stay ' fueled ' . Probly a 6 Oz / 150 c.c. fuel tank .
p.s. Hope youve got a good strong ' no slop ' control system . 1/8 wire ( 3.2 m.m. dia. ) horn wire etc . Plus the 4 inch bellcrank . for leverage . Even a 4 1/2 " bellcrank ! .
Dave Hull:
Michael,
That looks like a fun project! You might check this thread for some ideas on the Fox Eagle vs. the Merco:
https://stunthanger.com/smf/engine-set-up-tips/fox-eagle-engine/
The Divot
Michael Novobrantsev:
--- Quote --- You might check this thread for some ideas on the Fox Eagle vs. the Merco:
https://stunthanger.com/smf/engine-set-up-tips/fox-eagle-engine/
--- End quote ---
Thank you guys .
This is useful information
Air Ministry .:
--- Quote ---I know Merco is is good stunt engine , but his weight like Fox 60
--- End quote ---
Saves Noseweight, so the planes lighter . :-X
Think mines 130 Ex 110 Trans . Superb run. Will check ' the book ' ( when I find it :-[)
Keep the pictures flowing . H^^
Navigation
[0] Message Index
[#] Next page
Go to full version