Great Planes Siren Hotliner ARF Review - Page 46

nate 1001 · Oct 13, 2009, 08:58 AM

4:1 with an 18 inch prop and it would have to be steep also, like a 13 or higher

fwolf15 · Oct 13, 2009, 09:07 AM

Quote:

Originally Posted by nate 1001

4:1 with an 18 inch prop and it would have to be steep also, like a 13 or higher

Afaik maximum propsize is 15 inch, I've heard from a other guy that his 16" will not fit.

rgds
Wolfgang

nate 1001 · Oct 13, 2009, 09:22 AM

Then I guess that won't work

Andy W · Oct 13, 2009, 09:36 AM

Graupner has a spinner with a 1/2" aluminum backplate that I have used in several situations to allow me to get a larger prop on a hotliner or sailplane.
..a

fwolf15 · Oct 14, 2009, 04:16 AM

Quote:

Originally Posted by nate 1001

How about a 2826 with the gearbox on it and a 6 cell lipo. That should be able to swing a pretty big prop and get over 1000 watts for quite a bit of climb

one more detail is missing: which kind of 2826? /06 or 08 or 10 ?

here some results frome drivecalc for the different motors in combination with an 15 x 13 Aeronaut and a 4:1 standard gear on a 6S battery:

2826/06 :
53 A
6200 RPM
3704 gramm thrust
104 km/h speed
1070 Watt input

2826/08
28 A
5200 RPM
2600 gramm thrust
87 km/h speed
590 Watt input

2826/10
19 A
4600 RPM
2000 gramm thrust
77 km/h speed
400 Watt input

rgds
WOlfgang

nate 1001 · Oct 14, 2009, 03:37 PM

So it still would work. 3700 grams = ~ 8 pounds of thrust at 80 mph. Sound pretty good

fwolf15 · Oct 18, 2009, 09:07 AM

Quote:

Originally Posted by Serafin

I post this so no one would make my mistake and crash their Plane.
Do not mix your battery before you fly. I put a used battery in my Cularis. After take-off battery die and I was to low to recover. Was in a turn and wing stalled. Not enough room to build up speed and nosed dive into ground. I had a camera on the plane so you are getting front row seat on this crash.

Two weeks later I added fiberglass to nose area of plane so I can crash again. I landed plane and slide into crub nose first. I realize i bended motor shaft a week later after I posted this video on You Tube. Once again, front row seat.

ENJOY

wrong thread???

gopherhunter · Nov 07, 2009, 04:46 PM

Hi Fellow Siren flyers, I just got a new Siren, and have been reading a lot of your threads about this plane. Since my model is still unassembled, I want to glean as much info as possible about necessary mods and setups. The biggest question I have right now is what to do with the outer wing joiner and the joint itself. My planes AUW will be 3.25 lb. The specs say it should weigh between 3 and 3.5 lbs. As I get used to the Siren’s handling, I’m sure I will push it pretty hard eventually, I want it to be strong enough, and I don’t want any surprises.

I’ve read that if you make the joiner stronger, then the wing itself will break. I think I’d rather have a broken joiner. If I glue the joiner into the wing and the joiner breaks, it will be very difficult to remove the remains. My thinking is that if the joiner fits nice and snug in the wing, it doesn’t need glue. Should I fiberglass the joint itself by removing some covering and gluing a strip there?
I realize this is an entry-level hotliner. I would like to hear some opinions on any and all mods I should definitely do. My TX is a JRX9303, so any input on AIL/EL mixing, SPOILER/EL mixing, differential, dual rates, flight/landing modes that you can share would be great. I’ll be installing an AR6250 Rx, and it looks like the best placement for the antennas is out the rear vent hole behind the wing.
Help me keep her flying.

John

flightmare · Nov 07, 2009, 05:41 PM

Regardless if the wing brakes or the joiner brakes,your going to crash..
Yes,definately glue the joints as well as the joiners.Use epoxy on them,and you wont have a problem..My wing came apart on a hard landing..I just drilled a 5/16 hole and inserted a fiberglass rod,reepoxied the wing back together,and was back in business.

gopherhunter · Nov 07, 2009, 07:34 PM

"Regardless if the wing brakes or the joiner brakes,your going to crash.."
I had that picture in mind as I wrote my last post, but there is the possibility of only a fracture prior to a complete failure at the weakest point, and I wondered where that would be with a beefed-up joiner. Flightmare, thanks for the input. You broke a wing on a hard landing, which is my style... any breakage while flying? You said "you won't have a problem". That's definitely encouraging, as I envisioned an inherent flaw in the Siren's wing joint engineering.
Thanks again.

flightmare · Nov 07, 2009, 10:33 PM

Ya Gopher,
If I remember right the "Stock" wing joiner consists of several pieces you need to laminate together to make the joiner..I used white glue,and clamped them together.Gave it a day to dry..Then I used 30 min epoxy to join the wing thirds.Take your time..
I did one side,and let it cure overnight,then did the other..The thing with epoxy is while it is "Going off",or curing,don't disturb it.
I apply blue painters tape to hold the joint tight while the epoxy sets..
The nice thing about the Siren is you dont have a grip of money tied up in the airframe if it goes in...
As far as the 9303 goes,Thats a good choice for sailplanes..Alot of fuctions for mixing and things like that..
Tons of good info out there too for the 9303..
Andy W did a review of the Siren ,and has some good tips on what to expect with the build...
http://www.rcgroups.com/forums/showt...t=siren+review

Andy W · Nov 08, 2009, 08:02 AM

This *is* the review thread!

We've just got 688 responses to it so far..

As to the wing joiners, build them as the instructions tell you. If you don't glue them in place, it will fail. I used 30min epoxy to assemble the joiners, and (of course) to join the wing panels.
..a

gopherhunter · Nov 08, 2009, 11:47 AM

Andy thanks.
The excitement is building.
Any and all input is greatly appreciated.
ZOOM

John

Nov 07, 2009, 04:46 PM	#684
gopherhunter Registered User Join Date: Mar 2009 Posts: 18	share your knowledge Hi Fellow Siren flyers, I just got a new Siren, and have been reading a lot of your threads about this plane. Since my model is still unassembled, I want to glean as much info as possible about necessary mods and setups. The biggest question I have right now is what to do with the outer wing joiner and the joint itself. My planes AUW will be 3.25 lb. The specs say it should weigh between 3 and 3.5 lbs. As I get used to the Siren’s handling, I’m sure I will push it pretty hard eventually, I want it to be strong enough, and I don’t want any surprises. I’ve read that if you make the joiner stronger, then the wing itself will break. I think I’d rather have a broken joiner. If I glue the joiner into the wing and the joiner breaks, it will be very difficult to remove the remains. My thinking is that if the joiner fits nice and snug in the wing, it doesn’t need glue. Should I fiberglass the joint itself by removing some covering and gluing a strip there? I realize this is an entry-level hotliner. I would like to hear some opinions on any and all mods I should definitely do. My TX is a JRX9303, so any input on AIL/EL mixing, SPOILER/EL mixing, differential, dual rates, flight/landing modes that you can share would be great. I’ll be installing an AR6250 Rx, and it looks like the best placement for the antennas is out the rear vent hole behind the wing. Help me keep her flying. John

Nov 07, 2009, 05:41 PM	#685
flightmare The frigin Catalina wine mixer Join Date: Oct 2006 Location: Sunny So Cal.. Posts: 520	Regardless if the wing brakes or the joiner brakes,your going to crash.. Yes,definately glue the joints as well as the joiners.Use epoxy on them,and you wont have a problem..My wing came apart on a hard landing..I just drilled a 5/16 hole and inserted a fiberglass rod,reepoxied the wing back together,and was back in business. Last edited by flightmare; Nov 07, 2009 at 05:53 PM.

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Oct 13, 2009, 08:58 AM	#676
nate 1001 Registered User Join Date: Jul 2003 Location: PA Posts: 76	4:1 with an 18 inch prop and it would have to be steep also, like a 13 or higher

Oct 13, 2009, 09:22 AM	#678
nate 1001 Registered User Join Date: Jul 2003 Location: PA Posts: 76	Then I guess that won't work

Oct 13, 2009, 09:36 AM	#679
Andy W That sickening crunch.. Join Date: Jun 1999 Location: Marietta, GA Posts: 39,796	Graupner has a spinner with a 1/2" aluminum backplate that I have used in several situations to allow me to get a larger prop on a hotliner or sailplane. ..a

Oct 14, 2009, 03:37 PM	#681
nate 1001 Registered User Join Date: Jul 2003 Location: PA Posts: 76	So it still would work. 3700 grams = ~ 8 pounds of thrust at 80 mph. Sound pretty good

Nov 07, 2009, 07:34 PM	#686
gopherhunter Registered User Join Date: Mar 2009 Posts: 18	"Regardless if the wing brakes or the joiner brakes,your going to crash.." I had that picture in mind as I wrote my last post, but there is the possibility of only a fracture prior to a complete failure at the weakest point, and I wondered where that would be with a beefed-up joiner. Flightmare, thanks for the input. You broke a wing on a hard landing, which is my style... any breakage while flying? You said "you won't have a problem". That's definitely encouraging, as I envisioned an inherent flaw in the Siren's wing joint engineering. Thanks again.

Nov 07, 2009, 10:33 PM	#687
flightmare The frigin Catalina wine mixer Join Date: Oct 2006 Location: Sunny So Cal.. Posts: 520	Ya Gopher, If I remember right the "Stock" wing joiner consists of several pieces you need to laminate together to make the joiner..I used white glue,and clamped them together.Gave it a day to dry..Then I used 30 min epoxy to join the wing thirds.Take your time.. I did one side,and let it cure overnight,then did the other..The thing with epoxy is while it is "Going off",or curing,don't disturb it. I apply blue painters tape to hold the joint tight while the epoxy sets.. The nice thing about the Siren is you dont have a grip of money tied up in the airframe if it goes in... As far as the 9303 goes,Thats a good choice for sailplanes..Alot of fuctions for mixing and things like that.. Tons of good info out there too for the 9303.. Andy W did a review of the Siren ,and has some good tips on what to expect with the build... http://www.rcgroups.com/forums/showt...t=siren+review

Nov 08, 2009, 08:02 AM	#688
Andy W That sickening crunch.. Join Date: Jun 1999 Location: Marietta, GA Posts: 39,796	This is the review thread! We've just got 688 responses to it so far.. As to the wing joiners, build them as the instructions tell you. If you don't glue them in place, it will fail. I used 30min epoxy to assemble the joiners, and (of course) to join the wing panels. ..a

Nov 08, 2009, 11:47 AM	#689
gopherhunter Registered User Join Date: Mar 2009 Posts: 18	Andy thanks. The excitement is building. Any and all input is greatly appreciated. ZOOM John