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Design => Stunt design => Topic started by: Michael Novobrantsev on February 05, 2020, 08:51:37 AM
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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
(http://os1.i.ua/3/7/15657780_350e49d3.jpg)
(http://os1.i.ua/3/7/15657779_81a72b09.jpg)
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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 ! .
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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
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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/
Thank you guys .
This is useful information
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I know Merco is is good stunt engine , but his weight like Fox 60
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^^
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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^^
Hello Air Ministry !
I do not undestand you fully, english is not my native language n~
You offer to me making nose more shortly ?
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130 Ex 110 Trans
this is about timing of engine . LL~
I measured compression ratio on merco 49 III dual plug , it sign compression ratio is 8 !!?
I think it is so few ? But engine run so good 13/6 prop
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Michael,
Welcome to the forum.
Your own design?
CB
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Sorry,
one of our silly English Jokes ! .
Heavy Engine = needs no nose weight = lighter aeroplane ! . ( obviously 1 + 1 = 11 theory )
The 130 - 110 is the timing -> piston opens closes exhaust & transfer ports .
(https://lh3.googleusercontent.com/proxy/zN-r9ubQXFfv7nuHLppb7L-yV6Z1TW5IytR7AOdoVjczloWnJ3gpSU6dvcQqa3zlDXJ8dBNzn7n5hzpRJkZd45gsQusEklhsSEsYcJ4kbaP0dX2cMGp4I_eTJBqHOFh12zz-QxbtZZPw_dQPpA)
Differant gasket under sleeve . the thickness . Varies Timing .
(https://www.burtonpower.com/media/catalog/product/cache/1/image/dbee39002c3ed3c5438224ee0989910f/T/D/TD1_Timing_Disc.jpg)
A pointer from lug , find top & bottom of stroke . Measure across from piston right down , ea side of b.d.c. , say 65 + 65 = 130 .
the MERCO cylinder is OFFSET ( Desaxe ) to crankshaft , so figue each side not identical .
Very Easy to ' drop ' the timing on a Merco . Lower Sleeve = thinner gasket .
BUT IF ITS GOOD , DONT STUFF WITH IT . Just keep it oiled .
==================================================
:P
Yes. Very intresting aeroplane . Nice look .
To see drawings would be good .
http://sceptreflight.com/Model%20Engine%20Tests/Merco%2049%20&%2061%20Mk1.html
see last / bottom . " back to index " also .
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Sorry,
one of our silly English Jokes ! .
Heavy Engine = needs no nose weight = lighter aeroplane ! . ( obviously 1 + 1 = 11 theory )The 130 - 110 is the timing -> piston opens closes exhaust & transfer ports .
Differant gasket under sleeve . the thickness . Varies Timing .
A pointer from lug , find top & bottom of stroke . Measure across from piston right down , ea side of b.d.c. , say 65 + 65 = 130 .
the MERCO cylinder is OFFSET ( Desaxe ) to crankshaft , so figue each side not identical .
Very Easy to ' drop ' the timing on a Merco . Lower Sleeve = thinner gasket .
BUT IF ITS GOOD , DONT STUFF WITH IT . Just keep it oiled .
Thank yuo for you anglemeter
I will use in in my other engines too.
Your own design?
this is "BICEPS" , it have simply forms for easy productions .
https://www.airplanesandrockets.com/airplanes/biceps-article-plans-apr-1969-AAM.htm
I made change on some moments : I want cylinder in side position and disassembled construction for transportation .
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I keep making my Bipe .
Now it weight 950 gr 33.5 oz ( summary wing area 810 sq.in)
weight will be more from:
-engine+prop+spinner+tank
-wheels axle=wheels
- farbe +cording film
- upper flaps
- lateral struts between wings
(http://os1.i.ua/3/7/15680714_8d5c770a.jpg)
(http://os1.i.ua/3/7/15680717_22f53ac0.jpg)
wings sceletons are still not grinding ,
Leftovers of foam glue not yet cleaned .
I use PU foam glue because i work and obtain balsa and foam parts not very accurate yet :-(
and foam glue fills the gaps.
This connection obtained strong and elastic.
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Michael,
Looks like you are making good progress! Thank you for sharing your project with us.
You might find it fun to compare your biplane design to one from the 1955 Flying Models magazine. This design was named after the hunting dog, because it was supposed to "be a mean one," and keep the pilot "on his toes."
https://aerofred.com/details.php?image_id=80412#plan
Maybe it being so short coupled had something to do with that.
I recently finished a plans-built BiSlob, and find it to be twitchy, which is probably not really what I enjoy flying.
Dave
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Dont know if thats a NYLON elevator horn ! ?
You have to be very carefull with controls . Bullet Proof .
Steel 1 inch arm ( 25 to 28 m.m. ) and 1/8 in wire ( 3.2 m.m ) so no twisting or slack .
Most people use 4 inch ( 100 m.m. ) bellcranks with maybe 22 arm . Carbon Fibre ( Arrow Shaft ) pushrod .
Controls are one of the most important parts of the aeroplane .
that Asside , its looking good . What are the cabane struts made from .Not Steel wire ? .
H^^
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Horn made from Ф3.2 mm strong durAl bar , it bar use to Argon welding for ALMg alloy
Nylon part is connecting horn arm with carbon pushrod .
Horn arm have thread and nylon connector too , i can turn connector to high or low for change to ratio .
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Has anyone else noticed? The wire to the elevator pushrod seems very small. Is the pushrod straight? Any bends in it? Be careful there is no flexing in the pushrod.
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Now pushrod is stright , diameter 2mm Bicycle spoke
( it may be 3.2mm Al)
that do you think ?
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3/32 inch , is 2.4 mm .
In Kiwiland in 76 , the wire was ' S .W.G. ' which is English Sizes . 10 G = 1/8 In ; 8 G. = 1/10 in .
2.7 mm was a good size , more ' bearing area ' than 2.4 , and for other things . But .35 models & .15 Combat wings at the ton . 160 + kph .
PUSHROD ends at 3 mm diameter will save some weight over 3.2 mm ( 1/8 ) Wire . But either is o.k. ,
Best to have the ' L ' bend at the end say 25 mm to pushrod . say 38 mm ' binding ' to rod . So Wire 2 1/2 inch say 65 mm overall .
i whack the pushrod end over , then cut the bent end tto 3 mm high , to stick in hole , or slot for fine setting , then epoxy & bind
with strong thread . Pushrod on the OUTSIDE of the tube .
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Couple a pictures , out of a Staler 76 in a 9 now 0 80 ounce 800 sq in plane . 1/8 inch - 3.2 m m Wire .
(https://stunthanger.com/smf/index.php?action=dlattach;topic=45265.0;attach=293809;image)
(https://stunthanger.com/smf/index.php?action=dlattach;topic=45265.0;attach=293812;image)
Often the pushrod at the bellcrank , the C.F. rod needs to start ' past the arm ' , mainly to clear the leadout wire .
Therefore the wire at that end, may be way longer . like 4 inch , plus . Over 100 m.m. , to get good adhearance on / to pushrod .
If you build em tough .
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Some in a STREGA - 90 Oz . 1/8 wire .
(https://stunthanger.com/smf/index.php?action=dlattach;topic=51075.0;attach=289517;image)
60 inch Mustang Bellcrank .
(https://stunthanger.com/smf/index.php?action=dlattach;topic=43652.0;attach=254923;image)
https://stunthanger.com/smf/stunt-design/60-span-51-size-p-51-mustang/
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Hello Friends !
During 3 month i was hard working in bicycle service , I back to build my biceps project
now .
I cover wings flaps and stab by monocote .
(http://os1.i.ua/3/7/15768176_45ce306.jpg)
(http://os1.i.ua/3/7/15768177_613bd840.jpg)
was painting fuselage .
wife and daughter made to me two variants of pilots
(http://os1.i.ua/3/7/15768180_cc6af1fd.jpg)
(http://os1.i.ua/3/7/15768179_78c39327.jpg)
construction of fuselage make possible simple changing of pilots body by "SCREW IN THE ASS "
engine , tank and other parts ready to installation .
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8)
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Love the colors. H^^
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(http://os1.i.ua/3/7/15773266_5587d2e4.jpg)
(http://os1.i.ua/3/7/15773267_30e0e9a2.jpg)
i think , needed circle on the lower wing or no ?
may be no ...
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I believe nobody can pay attention to it during flight 8)
H^^
Peter
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Love it!!!!
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Personally, I'd go with the Fox on a 12 X 6 at 10 K. I ran one that way and it flew beautifully. It was a mono plane......can't think of the Bleeping name. Darn old timers!
Good luck, Jerry
PS: Love the cover job!
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Hello!
made 5 flying on this week ,
engine FOX 60 Eagle (abc p/l)
Bipe very sharp - maneuvr .
speed is good-comfortable
prop 13.5/6or7
I tried to fly with different position of cable on inner wing end and made choice of comfortable position .
(http://os1.i.ua/3/7/15779240_d84fde83.jpg)
(http://os1.i.ua/3/7/15779242_1281a80f.jpg)
(http://os1.i.ua/3/7/15779241_bd28e5c5.jpg)
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Wooden venturi?? That's a new one to me. Well done with the build.
Rod.
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I made wooden ventury several times on different engines .
It s simple.
Easy to grind by conventional drill or screwdriver , no need lathe.
just soak this part in fluid epoxy ( before installing) S?P .
It may been resistant to methanol and nitro.
we are the people also not iron and no eternal H^^
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Have you gotten the Biceps in the air yet ?
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Yes I started to fly month ago , but Bipe is CrAzy %^@
(http://os1.i.ua/3/7/15811232_29b9503e.jpg)
(http://os1.i.ua/3/7/15811234_ad9acdeb.jpg)
(http://os1.i.ua/3/7/15811233_4cde6b78.jpg)
Yesterday i was reduced rudder and flap costs , distance between cords too,
the iron cone and muffler is heavy , but still very sharp - I will lengthen the nose S?P
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Nose was made longer 60 millemeters .
Result - more stability.
i taking good bipe .
This is second trying of all figures .
I will taining for better flying %^@
https://www.youtube.com/watch?v=M_g-vdKu65o
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Very Good .
Glad to see your not just playing with it . It flys very good .
Every body should have a Bi Plane . After all, real aeroplanes all have two wings . H^^
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Looks like it flies very well. Nice job all around!.....Gene
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Nice steady engine run also. It was really stable even through all the twists & turns. AP^
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Looks like it is doing good even though it may be a little fast. Might try a lower itch prop as you don't say which prop you have. On my 38 Special I have an LA 40 using an Top Flight 11-4 prop on 60 foot .018 lines. D>K
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fuel 80/20 methanol/castor
line 53 feet , because quickly
propeller (http://os1.i.ua/3/7/15827741_11aab73e.jpg)
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Your biplane has nice proportions, and looks good in the air. With your large engine, you should do better with longer lines. 53 feet lines would be normal for a .35-size plane..
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I will happy flying on more long lines , but nearest site for everyday training so small. On beginning build bipe i was wanted more powerfull and heavy plane for this small circle , because i made bipe thinking that just bipe compact size and powerfull engine for sharp maneuvers on 53ft lines . every sunday i going to big area and fly on 63 ft lines .
I like it !
Time and space added in sphere. I dream on small circle training learn me flying more sharp and clear.
Today i try to used 12.5x6 prop - 4-2-4 transitions occur more easy, traction almost did not decrease .
I think 13.5 slightly heavy to my engine,
Tomorrow i try 13x6 prop.
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https://vk.com/control_line?z=video-126621217_456239512%2Fb49ed8f3224833a240%2Fpl_wall_-126621217
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Thanks for links .
One good people , wich live in Dushanbe (Tagikistan) , made site for c/l stunt on the russian language , it including many plans .
https://clstunt.ru/
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Looks like it is doing good even though it may be a little fast. Might try a lower itch prop as you don't say which prop you have. On my 38 Special I have an LA 40 using an Top Flight 11-4 prop on 60 foot .018 lines. D>K
Now i made choice of prop it is 330/165 or (13/6inch) the fly became slowler .
https://www.youtube.com/watch?v=0qXTXyikeqE&list=PLRSH27KII6-rj-uW1PoHnMC9kyLP10aJT&index=6&ab_channel=novobrantsev
Today is cold weather winter begins .temperature -1 to +2 C.
Hands and engines freezing , i do not know how i can flying later ... Z@@ZZZ