Dave Grife: Coldwater, Mi. USA
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| The latest project of mine,
something of a work in progress. "IKE" 1/4 scale project: 64" span 700 sq.
inches airframe weight 46 oz. finished estimates: 112 oz. wingloading-
23oz./sq.ft |
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| Here's a picture of the
Maxcim motor w/ planetary gearbox. The Maxcim MaxN32-13Y on 20 cells turns a
APC electric 18-10 at the same rpm as a Hacker B50 XL on 20 cells.... and the
Maxcim is much smoother on the throttle. Sorry that the picture is fuzzy....
I'm also using the new "Super Universal Mounting" System motor mounts available
from New Creations. This is by far the best commercially available mount that
I've ever used. The S.U.M. mount is very light weight and much more rigid than
anything that I could make. The cool thing about it is that you can mount
virtually any motor on it with the various frontplates and the length is
adjustable for various motor/gearbox/shaftlengths. This is ideal for me,
because I love trying different power system setups in planes. |
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| Here's three good looking
birds... |
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| Bottoms up! The "IKE" was the
holder of the absolute inverted speed record in the 1930"s.!! |
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| A back shot... |
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Dave ! A labor of love ... I
like... (maybe a dentist could have a closer look at all those holes) -- Helge
Yeah, I've drilled a few holes in my day. A much better shot of the
Maxcim and Super Universal Mounting System. -- Dave |
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| I'll be putting the wheel
pants on next week. The Howard's "IKE" was all gloss white with black
lettering. Mr Mulligan was another one of Ben Howard's later designs again all
white with black lettering. The "IKE" raced in the National Air Races begining
in 1932 thru to 1938, winning many of the events throughout it's racing career.
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| The model will weigh about 7
pounds. I'm planning on running at 900 watts to the motor using 20 cells. Scale
full speed was 240 mph. 60 mph (1/4 full scale speed)--- easily obtained |
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Final weight is 8 lbs. a bit
more than I planned. Wingloading is still about 25oz/sq.ft --range though It is
set up for the 4/5ths sub C cells for the test flight. Going to cp-2400's will
add about 10 oz.
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| Again, I'm using the Maxcim
motor w/ planetary gear box. This turns an APC-E 18-10 at 5200 rpm. This is on
twenty cells (non-zapped) @ 40 amps. This still gives me more than 100 watts/
pound and I have the option to add more prop or cells if I desire. |
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| "IKE" FLYS GREAT !!!!!!!!!!!
8-10 mph crosswind today, But the "Ike" flew very nicely. Loops, rolls and 4
point rolls are all that I did today. She wanted to weather vane slightly but
still a great pleasure. First flight with 4/5ths sub C's landed at 4 min.
Second flight with cp-2400's landed at 6 min. I still had some electrons left
after each flight. Ground handling was a bit tricky, those gear are long! .
I'll have to get some Lithium Polymers. Chris Balser took the flight
photos |
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| The photo shows the Super
Universal Motor Mount (SUM)(available thru New Creations & Espirit Models.
Information @ www.cambriatool.com/sums).
I spent 15 minutes and replaced the Maxcim motor with a Hacker B50. I used the
1/4" spacers for the Super Universal Motor Mount (SUM), which can be seen in
the photo below. I really like having the flexability and freedom to try
different motor/gearboxes on a moments notice. The Hacker B50 11XL is about
4oz. heavier than the Maxcim, but it may be a bit more powerful. I'll use the
same batteries and prop and report on the performance sometime tommorrow. Dave
Grife has attached this image: |
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| "Ike" on a Hacker
Today !!!!!! The Hacker B50 11XL w/ 5.2 powered the "Ike" today. I used the
same prop 18-10 APC-E. The same two battery packs of 20 cells. 4/5ths sub-C's
& CP-2400's. Maxcim motor drew about 40 Amps and 5100 rpm Hacker motor drew
about 44 Amps and 5500rpm The Hacker motor system flew like it was running on
about 4 to 6 more cells. Flight duration turned out to be nearly identical. The
Hacker motor was also significantly cooler upon flight completion. My
excitement, yesterday with the maiden "Ike" flight, was eclipsed by my
excitement with the performance today. This is the most powerful scale electric
that I have ever seen. I suspect that the Maxcim motor would have prefered that
I not ended up 1.5 pounds over my initial gross weight target of 7 lbs. I'm
confident that if I altered the gear ratio and cell count w/ the Maxcim I could
get similiar results. But luckily, my 1/6th scale Howard Hughes H-1 racer is a
7lb airplane waiting for a motor upgrade. New home for the Maxcim. The "Ike" is
now Hacker powered. |
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