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Old Sep 30, 2011, 07:41 AM
Never fly an A model anything!
jayb1rdz's Avatar
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They appear rounder than the square edged full scale but a least they are fenced. I am not sure if that will help at our speeds but it still looks ok to me. I am treating it as a sport jet since the Habu is still months away and a lot more expensive.

I am not keen on the livery but I can change that. J
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Old Sep 30, 2011, 08:03 AM
310mph Kolibri T25 Swist
henke's Avatar
Sverige, Kronobergs Län, Ljungby
Joined Jan 2001
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Quote:
Originally Posted by vettster View Post
Gaz-b.. I think you were asking about the exit diameter. Its exactly 75mm

I weighed the fues with the canopy on, and it came to 982g

Trev
and the wings? :-P
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Old Sep 30, 2011, 08:26 AM
Life begins at transition
Australia, VIC, Sale
Joined May 2007
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It's strange that the fuse is roughly the same size as the Habu, and lighter.
No-one's complaining in the Habu thread about weight?

Hopefully mine will come next week. SM89 on 8s to begin with, retracts are a must where I fly. Everything will hopefully come from the spare parts bin.
When the Habu finally reaches Oz, I'll get that too to compare them.

I wonder how hard it's going to be to re-profile the intakes?
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Old Sep 30, 2011, 10:07 AM
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MagnusEl's Avatar
Sweden, Gävleborg County
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Quote:
Originally Posted by henke View Post
and the wings? :-P


From one of the other Viperjet threads:

Quote:
Originally Posted by shamu View Post
Just received mine.

1640g ~ 3,6lbs
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Old Sep 30, 2011, 04:38 PM
310mph Kolibri T25 Swist
henke's Avatar
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Quote:
Originally Posted by MagnusEl View Post
From one of the other Viperjet threads:
thanks
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Old Sep 30, 2011, 04:39 PM
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Norwich,UK
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Quote:
Originally Posted by vettster View Post
Gaz-b.. I think you were asking about the exit diameter. Its exactly 75mm

I weighed the fues with the canopy on, and it came to 982g

Trev
Hi Trev have you weighed the other airframe components wings etc
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Old Sep 30, 2011, 04:53 PM
"Take Off" eh!
vettster's Avatar
Canada, ON, Beeton
Joined Aug 2008
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Fuse.....................982
2 wings.................428
2 Hor Stabs...........118
Rudder+EDF Hatch..39
wing tips...............57
two spars..............32
=1664g
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Old Sep 30, 2011, 05:05 PM
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with the components i intend using that's an auw of about 3.6 kg ran the lander again today with the makeshift eflux and pito 3.7 kg thrust and 206 mph exhaust speed 3.1 kw.zippy cells droped to 3.4v per cell under load so more improvements to be made there.did your fues weight include plastic fan unit included ?
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Old Sep 30, 2011, 05:23 PM
"Take Off" eh!
vettster's Avatar
Canada, ON, Beeton
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Yup! 8 pounds. Did you include the hardware and servos. Lets just say 9lbs for argument sake. On a bungee that would be 45lbs of pull Hense the reason Im going with gear this time
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Old Sep 30, 2011, 05:26 PM
"Take Off" eh!
vettster's Avatar
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Joined Aug 2008
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I hesitated and lost out on a good deal for a Shuebeler Fan and 700 motor
Look like Im going with the HET fan and a 700 motor now. Probley going for a HP setup with a short flight time as I always do.

Any recommendations to a Very Powerful motor from HET. Im now going back to the 10s set up on 4500 nanos.
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Old Sep 30, 2011, 05:29 PM
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yup the 2.6-3 KG on HK listing a tad misleading.
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Old Sep 30, 2011, 05:49 PM
Never fly an A model anything!
jayb1rdz's Avatar
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The viper should have a lower wing loading than the Habu then as well so a few extra grams could be put down to size. Anyway, as I said earlier, I am not treating this as an ultra scale. Just a affordable sport jet.

Down here in Oz, it's hard to get anything more affordable. It will end up cheaper than the foam Habu.
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Old Sep 30, 2011, 05:50 PM
"Take Off" eh!
vettster's Avatar
Canada, ON, Beeton
Joined Aug 2008
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Lets compare this jet to one of the best! The $5000!!! BVM Electra http://www.bvmjets.com/Pages/kits/Electra_ARF.htm

Electra
WS..154cm
length.170cm

Viper
WS..125cm
Length..125cm

There's only a diffrence of 29cm there in the WS. And thats what really matters.

Here's the BIGGY!

Electra
14-15lbs

Viper
9lbs

I think if the Viper has any kind of half decent setup, it will fly just fine

Yes! the Electra has a 110mm fan, but then again, the Viper isnt going to be carrying the extra 6lbs, now is it
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Old Sep 30, 2011, 06:02 PM
Never fly an A model anything!
jayb1rdz's Avatar
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MOTORS

The Het 700-83-975 is supposed to be the affordable benchmark in this range. I have heard nothing bad about it but I have swayed more to Mega motors as they drive my pylon and hot liners smoothly and with huge power.

I've had some customs built via Gary at Efflux specifically for Stumax fans. In fact, I have 4 motors and a SM90 and a SM100 on the Mega factory being tested as we type.

It's a slow process, I am hoping to have everything back inn Sydney in the next 5-6 weeks.

FYI cost have been comparable to HET and a fair bit less than some others. J
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Old Sep 30, 2011, 06:09 PM
"Take Off" eh!
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Thanks Jay!

Now have at er guys

Im heading to the basement

Oh yeah.. since I didnt pay the extra $400 for the instructions..I have some guess work to be done. I think White glue should do just fine to hold the wings on
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