FLY F3A

Here is some preliminary rounds for top 10 pilots.

Pre 1 (Sep 9) Pre 2 (Sep 10)

#1 T Onda 1429.0 1000.0 YS H Hatta 1450.0 1000.0
#2 K Suzuki 1414.0 989.5 OS K Suzuki 1436.0 990.34
#3 H Hatta 1398.0 978.31 Hacker Y Akiba 1411.0 973.10
#4 Y Akiba 1350.0 944.72 Hacker N Kusama 1402.0 966.90
#5 N Kusama 1339.0 937.02 YS T Onda 1378.0 950.34
#6 H Haneda 1320.0 923.72 YS H Haneda 1317.0 908.28
#7 K Inaba 1318.0 922.32 YS K Inaba 1312.0 904.83
#8 H Yamaguchi 1315.0 920.22 YS M Harada 1268.0 874.48
#8 T Fukuda 1315.0 920.22 YS Y Suzuki 1263.0 871.03
#10 M Harada 1288.0 901.33 YS T Fukuda 1262.0 870.34


More to come.

TT

flywilly

My Feedback: (121)

Some photos would be nice, too!!

apereira

Is there a web page?

Thanks

ericng

[link]http://www.5irc.com/content.asp?id=1947252&db=TECH[/link]

shannah

My Feedback: (5)

What's up with Akiba's belt drive? Why is he running a belt drive on a hacker C50? The prop doesn't look like anything special and there is only one prop so it isn't a contra drive. I don't get it.

jim woodward

Maybe he wanted a smaller diameter prop, higher rpm, and to pass sound???
Jim W.

FLY F3A

Japanese Web site http://www.vit.or.jp/~tomo/gami/10jc/10jc.html From Mr, Ikegami's reports every day.

cmoulder

Hmm... wouldn't it be the other way around? Larger diameter, higher pitch at lower RPM?

EHFAI

Looks like he may have replaced the gearbox with a belt drive. Would be as quiet as an outie.

jim woodward

The prop on his plane does not look like a 21 or 22" prop. You are safer to spin a smaller diameter prop at higher rpm, than a longer prop with higher tip speed, in regards to passing sound.
Jim

PatternPilot

My Feedback: (58)

Here is the english version

http://babelfish.yahoo.com/translate...rUrl=Translate

FLY F3A

Preliminary 3rd, round was done. Here is finalists.

#1, T Onda 1413.0 2000.00 YS
#2, K Suzuki 1351.0 1979.85 OS
#3, H Hatta 1380.0 1978.31 Hacker
#4, Y Akiba 1379.0 1949.34 Hacker
#5, N Kusama 1356.0 1914.49 YS
#6, K Inaba 1336.0 1855.94 YS
#7, H Haneda 1261.0 1832.00 YS
#8, H Yamaguchi 1294.0 1824.49 YS
#9, T Fukuda 1243.0 1790.54 YS
#10, Y Suzuki 1313.0 1788.57 YS

Weather forecast says rain tomorrow, may be cancel the final rounds?

TT

FLY F3A

I found a picture for Mr,Akiba's motor unit, sorry for delay. The motor has 2 reduction belts and lighter than gear box unit.

TT

shannah

My Feedback: (5)

Thanks Tak

it is hard to beleive that this assembly is lighter than a gearbox. I'll bet it is quieter for sure.

kobago

See more details.

kobago

icicles

That is some nice clever engineering there. And to keep it light as well.

Awesome

Chris

wagen017

Kobago, do you know the function of the metal rings on the back? Is it for additional cooling?

I really love this belt solution!

Volkert

kobago

Volkert
Mr. Akiba said the following thing to me.
These rings are a fillet for cooling.
These fillets are necessary for the hot time of summer.
This is lighter than HACKER Q80-11S F3A.
kobago

FLY F3A

Thanks Kobago for informations. I would make correction about the motor for weight . It is lighter than an outrunners it's not gear box.
There was hevy rain in morning so they did only 2 final rounds for complited the championship. Here is final results.

#1, T Onda. YS. Azure Bipe.
#2,K Suzuki.OS. Mid Rex Bipe.
#3,H Hatta.Hacker.Pegasus.

That's all. Thanks.

Mastertech

My Feedback: (31)

It's not a belt drive for the prop.

It's none of the above. It's subterfuge only.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

It's really a YS sound and smoke generator.

..
.
.
.
Really nice piece of design and machining.

Derek.Koopowitz

Photo from the Japanese Nats... I think we should employ this here... one has to be within the 2m sticks in order to fly F3A.

guille2006

The belt system clearly reduces rpm. with so he can spin larger props.

Ricardo M.

#1, T Onda. YS. Azure Bipe.
#2,K Suzuki.OS. Mid Rex Bipe.
#3,H Hatta.Hacker.Pegasus.

The 3rd and 4th pilots in the Japaneese F3A Championship with Electric ? Mmmmmmmmmmmmm....................... The apocalipsys is near us.[sm=what_smile.gif]

cmoulder

What is interesting and intriguing is that it appears to utilize a much smaller diameter prop!

Must have HUGE pitch!!

dreadnaut

My Feedback: (5)

Thats what I was thinking. Also there is some power loss (lower efficiency) when you run through a transmission. Belts a quieter that gears, but if I remember correctly (it has been too many years since I took that class in college) belts have greater transmission losses, especially in a two stage reduction like that. If the weight saving is significant, that may make up for it.