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Old Oct 08, 2012, 01:24 AM
kin
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Originally Posted by henke View Post
1/9 is a standard turbine size which already exists. It would never fly on a 90mm EDF setup, not even a 90mm Schüebeler. All deltas need alot of juice and I bet a 1/9 Viggen will weigh in at about 8kg of flying weight. That would require atleast 8kg of thrust, or even better 12kg or so to keep the 1:1 ratio even at flying speed.

Of course fun with a Viggen in any size, but just don't think it will be able to fly on an avarage 90mm EDF setup.
See the photo about this full composite fuselage
The size like than size 2.0m models we are only 6.5-7kg flying weight . we use very light material to do the models , i thinlk the JA -37 can control in 5 kg roughlt .So if a good quality 90mm fan easy to get 4kg thrust . it can fly well !
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Old Oct 08, 2012, 02:18 AM
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Hi,
The absolute best size for JA 37 is 1:10. It is a huge aircraft with a lot of drag...
1:10 scale would be aproximately,
Lenght: 164.3cm
Wingspan: 106cm
Height: 59cm
This is perfect for 90/100mm fan, maybe 120mm but also for the small turbines. I have one already in this size. I'll take some pictures of it. It is beyond repair...
I will try to get you a plastic model of the JA 37.
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Old Oct 08, 2012, 02:22 AM
kin
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Joined Sep 2007
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Quote:
Originally Posted by marell01 View Post
Hi,
The absolute best size for JA 37 is 1:10. It is a huge aircraft with a lot of drag...
1:10 scale would be aproximately,
Lenght: 164.3cm
Wingspan: 106cm
Height: 59cm
This is perfect for 90/100mm fan, maybe 120mm but also for the small turbines. I have one already in this size. I'll take some pictures of it. It is beyond repair...
I will try to get you a plastic model of the JA 37.
ok i fix this size now , but the AJ -37 models in hand , so i will let it for refrence and looking for JA version , please try to help me about the models or detail drawing much better !Try to ask the real plan factory if you can !!

Kin
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Old Oct 08, 2012, 02:28 AM
310mph Kolibri T25 Swist
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Quote:
Originally Posted by kin View Post
See the photo about this full composite fuselage
The size like than size 2.0m models we are only 6.5-7kg flying weight . we use very light material to do the models , i thinlk the JA -37 can control in 5 kg roughlt .So if a good quality 90mm fan easy to get 4kg thrust . it can fly well !
5kg AUW would mean a kit weight of about 2kg. Well, possible I guess. The Feibao EDF Eurofighter is Viggen 1/10 sized and weighs in at 2100g empty.

I still vote for smaller (about 1/12 or 1/11) as this would make it more proverful on a 90mm EDF. It really needs a bit more thrust then weight to fly good.
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Last edited by henke; Oct 08, 2012 at 02:43 AM.
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Old Oct 08, 2012, 02:29 AM
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Originally Posted by kin View Post
ok i fix this size now , but the AJ -37 models in hand , so i will let it for refrence and looking for JA version , please try to help me about the models or detail drawing much better !Try to ask the real plan factory if you can !!

Kin
Give me a week!!!
I´ve found this today.
http://www.aviationmegastore.com/saa...d=0&art=107101
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Old Oct 08, 2012, 02:35 AM
310mph Kolibri T25 Swist
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Originally Posted by ticketec View Post
1/8 is the normal/standard size for the smaller turbine models. I.e F-16's, F-15, F-86 etc. but I do agree with you that deltas do require quite a fair bit of power to get flying the same as a non-delta type wing layout.

What are the JA-37 sizes in 1/9?

Thanks

dave
Viggen is F18 sized but differ alot as it's a delta and needs alot of power to fly.

"The worlds only supersonic biplane"
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Old Oct 08, 2012, 02:45 AM
310mph Kolibri T25 Swist
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Quote:
Originally Posted by marell01 View Post
Hi,
The absolute best size for JA 37 is 1:10. It is a huge aircraft with a lot of drag...
1:10 scale would be aproximately,
Lenght: 164.3cm
Wingspan: 106cm
Height: 59cm
This is perfect for 90/100mm fan, maybe 120mm but also for the small turbines. I have one already in this size. I'll take some pictures of it. It is beyond repair...
I will try to get you a plastic model of the JA 37.
Your 1/12 seem to do great on an avarage 90mm setup. What was the AUW?

JA 37 3 (2 min 41 sec)
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Old Oct 08, 2012, 03:18 AM
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Originally Posted by marell01 View Post
Give me a week!!!
I´ve found this today.
http://www.aviationmegastore.com/saa...d=0&art=107101
You'll be waiting a while for that one. I believe it's not due to be released until early next year.

But if it's any consolation, their previous release was very well accepted but the plastic modelling community.

Thanks

Dave
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Old Oct 08, 2012, 03:32 AM
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Originally Posted by henke View Post
Your 1/12 seem to do great on an avarage 90mm setup. What was the AUW?

http://www.youtube.com/watch?v=hYc3MFuEwsk
About 2.8 kg. It was marginal in power... 1:12 is too small to fit the retracts. It is just not enough space.
Sincerely Marcus
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Old Oct 08, 2012, 04:17 AM
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Here's a picture of some a/c in the Viggen family.
First JA, then a green AJ, and last the Recce SF version.
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The different fin is clearly seen here between the grey JA and the green AJ. JA is also longer!
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This is what the nose of the SF looks like. It has a lot of cameras inside.
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Finally the difference in ailerons where JA version has 2 more pneumatic servos more on each side, and more weapon pylons.
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One last picture to show ya all this amazing aircraft. JA37 version!
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Sincerely Marcus
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Last edited by marell01; Oct 08, 2012 at 05:10 AM.
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Old Oct 08, 2012, 05:34 AM
310mph Kolibri T25 Swist
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Originally Posted by marell01 View Post
1:12 is too small to fit the retracts. It is just not enough space.
Sincerely Marcus
Viggen has a very special landing gear which probably needs to be engineeerd to fit the model regardless of size. How ever larger is more easy as you say.
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Old Oct 08, 2012, 06:22 AM
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Originally Posted by henke View Post
1/9 is a standard turbine size which already exists. It would never fly on a 90mm EDF setup, not even a 90mm Schüebeler. All deltas need alot of juice and I bet a 1/9 Viggen will weigh in at about 8kg of flying weight. That would require atleast 8kg of thrust, or even better 12kg or so to keep the 1:1 ratio even at flying speed.

Of course fun with a Viggen in any size, but just don't think it will be able to fly on an avarage 90mm EDF setup.
What Kin is doing is keeping the planes light...I would be skeptical if I didn't JUST maiden a 65" all composite\ built up wing Airliner that weighed 6lbs empty....7.3lbs AUW.

If Kin can keep it around 5KG then there are some reliable 90mm power systems that will fly it that will cost in the 100usd range (motor, esc, fan)

If not then I think TAM has some vids floating around of his A-4 being flown at a pretty good clip (150mph) with a 90mm and some really good eflux numbers but the power is in the 4kw range...

Haoye has their 114 and 127 that weight 20oz and put around 14lbs of thrust with certain motors....it can be made light no doubt
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Old Oct 08, 2012, 07:28 AM
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Quote:
Originally Posted by kin View Post
See the photo about this full composite fuselage
The size like than size 2.0m models we are only 6.5-7kg flying weight . we use very light material to do the models , i thinlk the JA -37 can control in 5 kg roughlt .So if a good quality 90mm fan easy to get 4kg thrust . it can fly well !
Kin,

Is that the A330 you used to make??

Thanks

dave
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Old Oct 08, 2012, 08:12 AM
310mph Kolibri T25 Swist
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Originally Posted by erh7771 View Post
What Kin is doing is keeping the planes light...I would be skeptical if I didn't JUST maiden a 65" all composite\ built up wing Airliner that weighed 6lbs empty....7.3lbs AUW.

If Kin can keep it around 5KG then there are some reliable 90mm power systems that will fly it that will cost in the 100usd range (motor, esc, fan)

If not then I think TAM has some vids floating around of his A-4 being flown at a pretty good clip (150mph) with a 90mm and some really good eflux numbers but the power is in the 4kw range...

Haoye has their 114 and 127 that weight 20oz and put around 14lbs of thrust with certain motors....it can be made light no doubt
I would love a light airframe of caurse, but there are some diffrence in light and magic

For me the actual size doen't matter but for selling alot of airplanes I think smaller is better.

But again, I'm not the one decideing, just chimeing in with my thoughts.


(I know about the Haoye 127, an amp hog. 10S 6000mAh required to howl a 11lb plane the way I think the Viggen should move. http://tinyurl.com/8h8gcyn)
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Old Oct 08, 2012, 09:01 AM
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Originally Posted by henke View Post
...
(I know about the Haoye 127, an amp hog. 10S 6000mAh required to howl a 11lb plane the way I think the Viggen should move. http://tinyurl.com/8h8gcyn)

I get similar numbers to Dynamax on the 127mm...14.5lbs of thrust at 4400 watts..90amps on 12s...

Matched to the right motor the fan is just fine....

I used the scorpion 560kv 4035 motor

If the fans exhaust is choked down too much blades stall big time
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