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Nov 16, 2012, 09:22 AM
Registered User
The_RattleSnake's Avatar
Quote:
Originally Posted by headlessagain
I agree. I once asked why the Rare Bear with it's fat fuse and big frontal area is the fastest of the Skyangel/HK Funfighters. The answer was the lack of panel lines. I believe they have had one at around 136 mph on a different motor.
Andy
I also herd that the airfoil used was a big factor.
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Nov 18, 2012, 10:46 AM
Upstanding Member
Kurt's Avatar
The Dually is painted up and almost flight ready.
Went a little wacky on the paint scheme. Would have liked to go with a more correct silver/red/blue Red Bull scheme but none of the silver paint I had left a decently smooth finish like white. Should be good for vis anyway which is the most important thing.

Took her out to the field yesterday but it was a bit windy and I didn't have time to go through all of her systems thoroughly so the maiden will have to wait.

For the first flight at least I'll probably not worry about differential thrust (or counter rotating props), just make sure she flies and handles well before adding this extra layer of complexity.
Got the central elevator mixed in to the elevons, batteries wired in parallel so the motors spin at the same RPM, and left/right sides balanced.
Not sure if I'll launch her from the skid I glued in the center, or maybe an underhand toss grabbing the leading edge-side of the central wing.
Any other ideas?
Nov 18, 2012, 11:44 AM
Reap the wild wind
headlessagain's Avatar
Nice paint job on the twin. Looking forward to the maiden flight report.
Andy
Nov 18, 2012, 07:59 PM
Turbine pilot
setxws6's Avatar
LOL that's awesome. Should be an interesting maiden!
Nov 19, 2012, 06:41 AM
Registered User
The_RattleSnake's Avatar
Great job you are doing there.
Quote:
Originally Posted by Kurt

For the first flight at least I'll probably not worry about differential thrust (or counter rotating props), just make sure she flies and handles well before adding this extra layer of complexity.


Just wondering why you say this.
You will have double torque roll if they both spin the sameway, none of you use counter rotating props.

Counter rotating is a must with duel props!
Nov 19, 2012, 07:33 AM
Turbine pilot
setxws6's Avatar
Quote:
Originally Posted by The_RattleSnake
Great job you are doing there.

Just wondering why you say this.
You will have double torque roll if they both spin the sameway, none of you use counter rotating props.

Counter rotating is a must with duel props!
Agreed
Nov 19, 2012, 04:29 PM
Upstanding Member
Kurt's Avatar
Quote:
Originally Posted by The_RattleSnake
Just wondering why you say this.
You will have double torque roll if they both spin the sameway, none of you use counter rotating props.

Counter rotating is a must with duel props!
Since I had flew my JPower P-38 without counter rotating props and the Radjet's 6x4s are smaller and lighter I didn't think it would be necessary but now you have me wondering... that's not a bad idea.
It wouldn't hurt anything to go this route so I'll do it.

Just ordered 2 of each of these:
http://www3.towerhobbies.com/cgi-bin...ZK90&search=Go
http://www3.towerhobbies.com/cgi-bin...PVF3&search=Go

tally ho!
Nov 19, 2012, 06:38 PM
Augermeister
dahawk47's Avatar
Very few full scale twins actually have counter-rotating props. Few RC civilian twins have them either. My DH-88 Comet has them and they are nice but would the plane get airborne without them ? Probably
Nov 20, 2012, 05:21 AM
Registered User
harlyquin76's Avatar
That came up well Kurt, good job, cant wait to see a video of it flying!!!
Nov 20, 2012, 05:04 PM
Reap the wild wind
headlessagain's Avatar
Solentlife has a different approach to converting an HK airframe to a twin with his Parkjet twin. https://www.rcgroups.com/forums/show...postcount=1292 but will be first to maiden? He is going for contra rotating props on his set up
Andy
Nov 24, 2012, 09:43 PM
Registered User
Emil in Oz's Avatar

RadJet Settings


Hi all,,i will be buying a Radjet 800 pnp very soon,,my set up is Spektrum6ch,AR600Rx,,Eflight 30amp esc,,flightmax 1600mah batt.Before i learn how to launch this bird,could someone pls be able to give me some start-off settings for the Rad? I probably will start off slow just to get the feel of it,,wat % for the High@Low rates is a good starting point,,,i really want to get my head around this Jet and i dont particually want to be spending$ on fix ups so i thought it would be a good idea to get some info-i also have numerous peices of carbon fibre rods so any areas that require strength would be appreciated,,,thanks fellas hopefully i can come back with some on bourd footage ,,Emil W.A
Nov 25, 2012, 12:23 AM
Registered User
The_RattleSnake's Avatar
Quote:
Originally Posted by Emil in Oz
Hi all,,i will be buying a Radjet 800 pnp very soon,,my set up is Spektrum6ch,AR600Rx,,Eflight 30amp esc,,flightmax 1600mah batt.Before i learn how to launch this bird,could someone pls be able to give me some start-off settings for the Rad? I probably will start off slow just to get the feel of it,,wat % for the High@Low rates is a good starting point,,,i really want to get my head around this Jet and i dont particually want to be spending$ on fix ups so i thought it would be a good idea to get some info-i also have numerous peices of carbon fibre rods so any areas that require strength would be appreciated,,,thanks fellas hopefully i can come back with some on bourd footage ,,Emil W.A


If you are using the stock motor you wont need to reinforce it with carbonfibre.
Its very sensative on the roll so %100 for pitch and %60 rates for roll

Set the COG to 400mm from the tip of the nose (measure this BEFORE it gets blunt :P ).
Nov 25, 2012, 09:30 PM
Registered User
I would run one - or two - CF spar(s) right across into each wing. I used just the one 5mm CF tube spar, but wood skewers for and aft of that to keep thins aligned and their small 'joint support' they will give.
This is because pretty well no foam wing stays on a foamie 'properly' with just glue. Nothing glues it properly... and nothing can hold the forces a wing can have at 90deg to the joint some times. So eventually it will crack and/or break, if no spar.
Dec 02, 2012, 07:59 AM
Registered User
The_RattleSnake's Avatar
I broke the 150 MPH barrier in my RadJet today!.
Now i just need to edit it and get a doppler reading for confirmation.
Dec 02, 2012, 04:14 PM
Turbine pilot
setxws6's Avatar
Quote:
Originally Posted by The_RattleSnake
I broke the 150 MPH barrier in my RadJet today!.
Now i just need to edit it and get a doppler reading for confirmation.
We need details on what you did to get that extra mph


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