Funtana S hangar 9 - RC Groups
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Jun 20, 2003, 08:21 PM
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flyboss's Avatar

Funtana S hangar 9


Got it today, I would like to set it up with Aveox motor system. looking for opinions.
thank you
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Jun 21, 2003, 02:49 AM
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where did you buy the model from?
Jun 21, 2003, 10:44 AM
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flyboss's Avatar
from my local hobby shop
Jun 21, 2003, 01:54 PM
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hopsterguy's Avatar
And still Horizon shows as out of stock.
Jun 21, 2003, 10:57 PM
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Bill Mixon's Avatar
Typically, dealers (your LHS) get new items in before they are released by the distributors for direct sale.
I counted at least 3 of the Funtana arf's in a shop today.

Flyboss, do you already have an Aveox motor that you were wanting to use?

Bill
Jun 22, 2003, 12:00 AM
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flyboss's Avatar
no I do not have any motor set up for it.
Jun 22, 2003, 11:15 PM
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Katana


I saw one of these at out field today with a Saito 72. It flew very nice but he didnt really ring it out 3D wise. I was concidering a Axi 4120/14 conversion for this plane. I know the Hacker $$$$$ motor would be best choice but what do you think of the new big Axi? no gearbox to mess with...and will swing a 14" prop.

Ron
Jun 22, 2003, 11:44 PM
Eye Drather Beef Lying
ElectRick's Avatar

Funtana power


I bought a H9 Funtana kit Friday at SEFF, and got a new Mega RCn 41/30/10 outrunner for it on the advice of one of the vendors there. I sure hope it's enough motor for it. Gonna use 16 cells and prop for 40 amps.

Rick
Jun 23, 2003, 10:41 AM
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Gerald's Avatar
I won a Funtana in one of the raffles at SEFF. Ended up buying a Hacker B50 9XL 5.2:1 for it. I'm not sure yet what battery I'll use on it.
Jun 23, 2003, 11:17 AM
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"constant-thickness airfoil" on Funtana?


I'm wondering if someone would give me the specks on the Funtana's wing. Is the tip section really as thick as the root section? Ie. If the root was say 14% then the tip would need to be about 21-22% with a 18"root cord and a 12" tip cord. This is what is shown in the pictures from Hanger 9. They call it constant thickness? If anyone could let me know, It would be great. If you could tell me the cord of the root and tip, and how thick each really is I can figure the rest out for myself.I have been talking with Alasdair Sutherland( a brit aerodynamics writter for RCMW) about this via E-mail and he says this would make a horable design for slow flight. Hanger 9 says this design is great for slow flight. Thanks Wo
Jun 23, 2003, 11:26 AM
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Bill Mixon's Avatar
Yes, the wing is constant thickness.
I don't have any exact specs on it. I understand that it's around 2" thick.
Why does Alasdair think this wing is bad for slow flight or 3D?

I think the purpose is to have a wing that the root section stalls long before the tip.

Bill
Jun 23, 2003, 11:52 AM
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ElectRick's Avatar
I'll measure and post the wing's specs tonight after I wipe the drool off the kit.

Gerald, I remember speaking to you just after you walked back to your tent after picking it up from the raffle table. Someone was saying he would've bought the raffle batteries off you if you'd picked them or something like that. Congrats on the raffle win. I didn't win a dang thing all weekend, but even at $169 in Mac's hobby shop, the Funtana looks like a great deal for what it is. The instructions are pretty well done too (as if anyone really needs them for an ARF). I am going to look into making a hatch somewhere ahead of the canopy if it's structurally feasible. I hate having to disassemble to swap packs. And I've got to find a motor mount for this Mega outrunner. I hope I don't wind up wishing I'd gone the Hacker route...

Rick
Last edited by ElectRick; Jun 23, 2003 at 12:01 PM.
Jun 23, 2003, 02:40 PM
Registered User
"However, I must warn about using thick wing tips. Good old Osborne
Reynolds discovered that the flow around an object will be geometrically
similar if his number is kept the same. Change the Reynolds Number (Re)
and the flow characteristics MAY change. Or they may not! The change can
be quite abrupt. A small change in Re can bring a large change in the
airflow.

It is like workers in a factory. They will keep working away, happily or
not, until someone pushes them just slightly too far or some little thing
upsets them and they all down tools in protest and walk off the job. Our
Lift factory has two wings, one each side of a central administration
block, and the workers don't get to communicate much from one side to the
other. So although subjected to the same conditions one lot might down
tools and walk off while the others continue working though grumbling and
thoroughly disgruntled.

If you taper a wing the Re reduces towards the tip, and so the airflow
might change where the chord is smaller. In particular the airflow might
break away and the section might stall. And because airflow is fickle and
no two wings are identical, one wing might stall before the other. At
critical Re (often encountered at model sizes) this can happen to any wing,
but tapering the wing makes it more likely, and increasing the percentage
thickness makes it more likely still.

I always advocate using a thinner and/or less cambered section at the tip
of a tapered wing to avoid possible tipstall problems on landing or other
low speed manoeuvres. But this advice could be over-ruled for specific
purposes.
If as you say this configuration has been used successfully then maybe it
is deliberate, so that snap manoeuvres are easier. But you will have to be
very careful on landing. You would need to fly it onto the ground.

I hope this helps, and if you do use thickened tips, land carefully." This is a quote from alisdair. I have continude the conversation but we are both going to find more info before I post the rest. Wo
Jun 23, 2003, 02:46 PM
Registered User
As you can see it's not that he thinks it won't work. It's more of a why would you bother thing. He is addiment that this design will be a real pain in the but slow, Hanger 9 advertises it as having excelent slow speed handling. This is why the request for the actual dimentions of the wings, and tip root sections. Wo
Jun 23, 2003, 05:35 PM
Registered User

Picture of Funtana at TOC


Well Alasdair sent me this picture of the Funtana at the TOC. Don't seem to have the thick tips. Humm!


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