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Sep 08, 2020, 05:34 PM
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EightOhMike's Avatar
Reminds me very much of the Chrysalis... I built one and flew it for a few years before a prop came apart powering up at altitude and shook the nose to pieces. Loved that plane, and would love to get back into the hobby with this, FAA notwithstanding.
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Sep 08, 2020, 06:20 PM
Entropy is happening!
Jim.Thompson's Avatar

Soft brake setting.


Quote:
Originally Posted by EightOhMike
................. a prop came apart powering up at altitude and shook the nose to pieces. ..................
Which reminds me of something I learned only recently; snapping the throttle from full to stop can cause shock that will stress a folding prop hub unduly. It seems that some ESC's have a "soft brake" setting option to avoid or minimise this problem.
Mine don't, so I will need to learn to reduce throttle slowly to avoid this potential problem.

Apologies is this is too much off topic.
Sep 08, 2020, 06:27 PM
Entropy is happening!
Jim.Thompson's Avatar

Diagonal framing of control surfaces.


I like this feature. One of the challenges with built up wings, especially light ones, is the difficulty in achieving torsionally stable control surfaces.
I was looking at a similar model only yesterday that did not feature this framing method; three out of four wing control surfaces were slightly twisted.
Also, the wing tip framing is both a work of art (as has been noted above), and is a serious and no doubt effective way to stabilise this part of the wing that would be otherwise vulnerable to warping.
Sep 10, 2020, 05:45 AM
turn, turn, turn.
Too good to pass up.. I'll give it a try.
Sep 11, 2020, 01:13 PM
Time for me to Fly...
Mr. Wiz's Avatar
Seems to me in looking at the photos and building instructions that it has a pretty flat wing by comparison to the top F5J planes out there these days. Also, if my math is right it's a 945 sq.in. wing with a weight in the range of 44-48 oz. Thats a wing loading of 6.7oz/sq.ft to 7.3oz/sq.ft. Does that sound like a good wing loading? I'm asking these questions because I'm comparing this plane to the 3.5m Yellow Jacket. Of course, I'd build the Yellow Jacket with the flap mod that they offer. I know the latter has no ailerons but I'm not sure I'd miss them on a plane like this.
Last edited by Mr. Wiz; Sep 11, 2020 at 01:35 PM.
Sep 11, 2020, 03:10 PM
Sonoran Laser Art
Quote:
Originally Posted by Mr. Wiz
Seems to me in looking at the photos and building instructions that it has a pretty flat wing by comparison to the top F5J planes out there these days. Also, if my math is right it's a 945 sq.in. wing with a weight in the range of 44-48 oz. Thats a wing loading of 6.7oz/sq.ft to 7.3oz/sq.ft. Does that sound like a good wing loading? I'm asking these questions because I'm comparing this plane to the 3.5m Yellow Jacket. Of course, I'd build the Yellow Jacket with the flap mod that they offer. I know the latter has no ailerons but I'm not sure I'd miss them on a plane like this.
The YJ3.5 has 1221 sq in and avg weight is around 43 oz. This gets you close to 5 oz sq ft which is in the range of competitive F5J ships. The flaps will add a little more weight which is why I personally prefer the spoiler and it works well. One of my flying buddies is a very competitive F5J pilot and he has a 3M YJ line launch. He made a statement one day that he doesn't like RES ships, but the YJ turns like it has ailerons. I doubt you would miss them because it handles very well. It inspires a lot of confidence working low thermals because it's very forgiving-hard to stall. The Pulsars, Ava's, Eagles are always trying to catch it and if you have a little skill you can beat some big moldies too.

Just fun flying and comparing a 3M to the 3.5 it's kind of hard to notice much different, however in contest I have finished higher in the ranks with 3.5 from the start, consistently.
Sep 12, 2020, 05:08 AM
Entropy is happening!
Jim.Thompson's Avatar
Quote:
Originally Posted by Mr. Wiz
.......................... it has a pretty flat wing by comparison to the top F5J planes .............................
I thought so too.
It would be nice to find out the angle of the wing(s) dihedral and polyhedral break(s).
If that information is forthcoming, I will draw a single line representation in CAD to gain a subjective impression etc.
It does seem to me that very little dihedral/polyhedral is required to provide a small degree of spiral stability.
However, I have had little experience with planes of the size and type.
Sep 12, 2020, 06:54 AM
Time for me to Fly...
Mr. Wiz's Avatar
Quote:
Originally Posted by Jim.Thompson
I thought so too.
It would be nice to find out the angle of the wing(s) dihedral and polyhedral break(s).
If that information is forthcoming, I will draw a single line representation in CAD to gain a subjective impression etc.
It does seem to me that very little dihedral/polyhedral is required to provide a small degree of spiral stability.
However, I have had little experience with planes of the size and type.
Im not an aerodynamic engineer of any kind. All I can go by is what I feel when I fly the planes. From my experience, a little more dihedral makes the plane thermal turn better, particularly tight turns when the thermals are low and on the small side. And isnt that a big part of F5J flying, launching low and picking up those low level thermals?
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Sep 12, 2020, 09:54 PM
Registered User

Power train?


Howdy fellas! Just ordered one. $357 USD to Western PA. Quick question....what motor/prop, esc, and battery setup would be a good match you reckon? Thanks all!
Sep 13, 2020, 04:47 AM
Registered User

Dihedral answer.


Hi Guys,

First I would like to thank Jason Cole for the Stellar F5J review on RC group.

I have been reading on the thread some wondering about the dihedral.
To answer quicly you have 6 all together on the wing which is distributed on the first panel with 0 angle to ensure an ease of construction, 3 for the second and 3 for the tip, which is more than enough for what we're asking.

Please guys remember this is a woody, some would like to argue It should have more of this here or more of that there, keep in mind that you don't have the same constraint drawing a all wood glider than a all moulded, you have to keep things simple, ensuring a precise and an easy building method accessible for most of the people with a glider that can perform well on F5J.

Thanks to all.

Matthieu AUBER
https://www.ecirtech.fr/
Sep 13, 2020, 04:53 AM
Registered User
Quote:
Originally Posted by sateep
Howdy fellas! Just ordered one. $357 USD to Western PA. Quick question....what motor/prop, esc, and battery setup would be a good match you reckon? Thanks all!
Hi,

The glider has been designed around the XPower F2919/10 F5J light, you can get it I think at Aloft Hobbies.

Here is the link on my webpage , scroll down to equipement required.
https://translate.google.com/transla...ecirtech.fr%2F

Bye.

Matthieu
Sep 13, 2020, 05:37 AM
turn, turn, turn.
I'll be putting that motor in mine.
Last edited by Kenny Sharp; Sep 13, 2020 at 07:29 AM.
Sep 15, 2020, 08:49 AM
Registered User
wonder how it compares to the Inside F5J, it seems to be a bit more apples to apples
Sep 15, 2020, 03:48 PM
Entropy is happening!
Jim.Thompson's Avatar
Quote:
Originally Posted by jfint
wonder how it compares to the Inside F5J, ........................
A flying buddy of mine has an Inside. He is experiencing twisting of the control surfaces. There are no diagonal framing members in the Inside ailerons and flaps, which this model has. I would expect this type of framing would result in greater torsional stiffness; always a challenge in a built up wing.
There appears to be a lot more development gone into the Stellar. The wing tips construction, for one example.
I have only seen this thread on the Stellar, but at this early stage, I tend to favour it over the Inside.
Sep 19, 2020, 10:39 AM
Registered User
I also have the Inside F5J and the wings go into flutter really easily - the torsional stiffness of the wing is very poor. I definitely do not recommend it for this reason.


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