wood and fabric wing - beginners project- Mitchelle B-10

[mrbarry]

Goal : to fly , to feel the sensation of lifting off the surface , the bump up of thermals, to soar with the birds in to the higher atmosphere
turning ,banking ,soaring ,swooping ..Zooming !!!

to see the earth from above
last wing i built was a 12 foot span from balsa wood and paper ,i enjoyed the build.. is it too far a jump to a 33 foot from spruce and fabric ??
on the cheap
..
reference : http://spirit.eaa.org/apps/magazines/eaa_articles/1980_07_15.pdf


to fly .. a persistent imperative ..
part 103 compliant ...

on examination of available product , availability of plan . ease of build, performance of airframe to the desired envelope
sourced and procured a set of plans

http://home.earthlink.net/~mitchellwing/b10.html

available

sourced materials

http://aircraftproducts.wicksaircraft.com/viewitems/aircraft-kits/all-categories-aircraft-kits-mitchell-b-10?
the 2 pound density foam for leading edge [d-cell] not shown from wicks should i source at at walmart or lowes ? or get it from wicks after i give them a load of manure

joined this group
joined EAA
joined the local EAA chapter [how nice it was to find an EAA chapter local , a good omen }{

what else should i do
i am gonna need a great deal of advice
i trust all of you , and my local chapter , will provide .
like on the hang cage/crash cage . the 6061t6 tube has some fittings on joins [connections] ,, can not see them at wicks

but that is way down the road [maybe 500 hours work or a 1000] , 1000 hours i get motivated i can do that by spring

since a standard man year is 2200 hrs..

[martymayes]

what else should i do
i am gonna need a great deal of advice

i do need some encouragement


here is pic center section wing



If you want a great motivator, find someone with a flying B-10 and go watch it fly. Do you participate in the Yahoo Group for Don Mitchell's flying wings? Not a lot of activity there but I'm sure you could get any questions answered. I have been a fan of the B-10 ever since it was built, had B-10 and U-2 plans for many years.

Your workmanship looks great. If you do get the urge to bolt on a rocket engine, be sure to check out the Youtube video if the B-10 flying with a jet engine. It's cool.

[mrbarry]

that is not my workmanship , just a random example from the web of a B-10 center section ..

i see quite a number of part built wings w/o fabric.

i am in the yahoo B-10 group

https://groups.yahoo.com/neo/groups/mitchellwing/conversations/messages


these b-10 seem to fly good , early reference quote +- 6 G . late reference +/- 4 G . VNE up to 100 mph , 80 seems more common reference .
service ceiling at 12 K ,
here is the most current post up . ducted fan ..


http://www.youtube.com/watch?v=3_iSNO3QC10

[mrbarry]

Reference :AC 103-7 Appx 1 determining the maximum level flight airspeed of ultralights
http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/list/AC%20103-7/$FILE/Appx1-4.pdf

this document is considered +satisfactory evidence+ iaw FAA
this is easy , fill in the blanks and read the chart .
step 1 : compute the total drag factor
1 ] pilot drag factor : not enclosed supine 4.5
2] wing drag factor 136 sq ft x0.01 ............1.36
3]controle surface 4 sqft[est] .................. 0.056
4] wire drag .zero
5]exposed struts 4 x 0.4 ...........................1.6
6]landing gear drag factor 3x0.5................1.5
7]engine drag factor partially exposed..........1.5
8] subtotal .................................................. ................9.016
10] allow for induced & interference .............1.8
11] computed total drag factors .................................................1 0.8

step 2 :determine the maximum air speed use the chart.
reference page 3
examination of the chart reveals :@ drag factor 11
55 knts w/ 35 hp power [ aixro xf 40 wankel]
50.5 knts w 28 hp power [ hirth F33]
47.5 knts w 24 hp [sc470 konig 4 cyl radial ]
45 knts w 20 hp [sc430 konig 3 cyl radial]
.......................
airframe specifications http://home.earthlink.net/~mitchellwing/specs.html
indicate engine requirement 15-40 hp
chart suggests max speed with 15 hp to be 40 knts
some relevant airframe airspeeds:
Vs 27 mph
Vr 32 mph
Vx 36 mph
Vy 40 mph
Va 50 mph
Vno 58 mph
Vne
Vmaxld 40 mph
Vmins 35 mph

which engine t o choose
xf40 =7k$
f33=3800 $
konig 4 cyl saw one on ebay @1500 sometime last summer
available special order

or something else "
need engine weight 50 lbs +/-
fuel burn of 1.5 gph @ most efficient
please review my number crunching and thinking
AND
suggest a power plant
image : Konig SC 470 mounted on a B-10
4257
and a run up

http://www.youtube.com/watch?feature=player_embedded&v=FEx2b2LByUA

ohmy omy

just yesterday a 4 cyc konig was listed on ebay
what to do ?what to do
a 1983,, zero time .
what i did: sent message asking about the carb .

called the local eaa chpt tech/flight advisor. for advice [pending ]

researched : research revealed Deiter Konig [engine builder of some repute in some circles]

http://en.wikipedia.org/wiki/Dieter_K%C3%B6nig

Dieter König (19 May 1931 - 15 August 1991) not only raced hydroplanes, but was also responsible for manufacturing the engines that powered them. During the 1960s, 1970s and 1980s his "König" engines dominated the sport.
The engines were manufactured in his hometown of Berlin (http://en.wikipedia.org/wiki/Berlin), Germany.

4 banger . radial .. RAD MAN
bore 66mm
stroke 42 mm
disp : 579 cc
redline 4200 rpm
engine weight complete 19 kg
direct drive
hummm advice please .. an 83 case original konig , i guess. Zero time .. [ya sure]

[mrbarry]

bid and won .. one each 4 pot radial

http://eaaforums.org/attachment.php?attachmentid=4267&stc=1

[mrbarry]

bid and won .. one each 4 pot radial

[mrbarry]

WHERE IS THE ANALYSIS and criticisms OF MY :

:AC 103-7 Appx 1

calculation:


and judgement . if the calculations can be applied by FAA as +satisfactory evidence+ to an existing airframe can not ,, then: those same calculations be applied to a proposed power plant and airframe to project +likely+ performance ..

...

i wonder ..

[Dana]

The AC103-7 calculations are conservative, meaning that the actual stall and top speeds will likely be somewhat higher then the calculations predict.

[martymayes]

What kind of support exists for the Konig radial engine?

[mrbarry]

ty dana .

i conclude that , assuming i can put the engine into condition, 24-28 hp will fly the B-10 airframe nicely , don't you think. ?

marty: support exists , there is a active [to some respect] yahoo group on these konigs.
from there i see that when the magneto sys goes kaput they put on a new husquvara sys. some modification require , i think .

wiki says :http://en.wikipedia.org/wiki/K%C3%B6nig_SD_570#Variants

"The engine was originally designed and produced by Dieter König (http://en.wikipedia.org/wiki/Dieter_K%C3%B6nig) of Berlin (http://en.wikipedia.org/wiki/Berlin), Germany (http://en.wikipedia.org/wiki/Germany). The design was sold to Zanzottera Technologies (http://en.wikipedia.org/w/index.php?title=Zanzottera_Technologies&action=edit&redlink=1) of Italy (http://en.wikipedia.org/wiki/Italy) and then sold again, along with the rest of Zanzottera's two-stroke ultralight aircraft engine line to Compact Radial Engines (http://en.wikipedia.org/w/index.php?title=Compact_Radial_Engines&action=edit&redlink=1) of Surrey, British Columbia (http://en.wikipedia.org/wiki/Surrey,_British_Columbia), Canada (http://en.wikipedia.org/wiki/Canada).[1] (http://en.wikipedia.org/wiki/K%C3%B6nig_SD_570#cite_note-Cliche-1)[2] (http://en.wikipedia.org/wiki/K%C3%B6nig_SD_570#cite_note-CRE-2)"
compact radial now owns the license on this powerplant and indicates it is available new built as special order .
http://www.compactradialengines.com/mz570.html

it made me ill buying the 4 cyc konig on ebay. guy built a box for it in Calif out by camp pendelton , UPS failed to show up with the ship label and it was frustrated freight for a while. Blocking engine in the box was inadequate. more proper would have been to bolt the mounting frame [orig included] to the crate with a good backer, however the thing came adrift in transit and nearly ate a hole in the box.
power plant came off a quickie where it hung for 3-10 years .
some documentation available both on the compact radial site and the yahoo group.
Mahle aircooled 66 mm cylinders , pistons and rings too , maybe 66 mm is a common and available size.
came with a little Gurtner carb that has never seen fuel.
i am considering my next course of action on this little power plant ,
what i would like to see is it hung up on a test frame next week with a dummy prop..
i think i will pull the plugs and intake/exhaust manifold and squirt a little mysterymarvel oil in .
figure out the magneto wiring , then put 12volts to the starting circuit , see if the starter spins the crank and test magneto function .
or whatever the EAA Tech guy at the chapter advises

[mrbarry]

i am not displeased with this engine. . the germans tell me the Berlin Builds are superior to the italian and canadian ones. .
this one is an 83, i am unsure if that means an berlin or no.

i do not think they ever got this thing to run. splices in the magneto circuit are suspect/broken. there was a big glob of clear ?rtv? on delving into it i revealed cracked insulation and arc marks. . buggerd up magneto pick off is in interference with the rotor.
goofy french slide carb 's bowl shows no sign of fuel .
i wonder if a little skinners union carb might not work better . or a bing , i know about SU carbs though

the original Konigs rate at 28 hp , the compact radials at 24 hp.

ac 103-7 +seems+ to indicate a probable airspeed of 45 knts at 20 hp. extrapolation of the power curve chart on the 4 cyc one might guess 20 hp at 28-32 hundred rpm , maybe.
these konigs are supposed to be quite quiet . and at 3 K rpm might well have a nice engine note.
the Hirth F33 on the other hand is off the shelf proven in service dual ignition . little screamer , i am quite out off by the engine song of these high winding single cylinders.

1983 engine , 1980's air frame ..
not aan EAA member around would not like to see this 4 cylinder 2 stroke Konig on a B-10 well built

i think i will really enjoy the wing build , i have fond memories of building wings , just a 12 foot balsa, i expect spruce to be nicer to work with.

positive enforcement feed back is a ++ plus up

[mrbarry]

ooh ooh ;;

check thisout
http://www.ebay.com/itm/Ultralight-aircraft-complete-with-Mitchell-B10-wing-/131341020670?pt=LH_DefaultDomain_0&hash=item1e9488edfe&autorefresh=true

looks like an original kit assembled

i would want to fly it down ..
sure i have some stick time , but not in type ,
learn to fly and land on delivery ..
i need not speculate what my eaa adviser would say

[mrbarry]

IMAge

http://eaaforums.org/attachment.php?attachmentid=4290&stc=1