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Feb 22, 2020, 03:01 PM
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davereap's Avatar
Almost finished.. needs props and the differential thrust better tuned in..
weight with a 3s 450 is 7.4oz... 210g... 3.86ozsqft 1.91666sqft
colour and props required,
Last edited by davereap; Feb 23, 2020 at 04:11 PM.
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Feb 23, 2020, 04:20 AM
Reap the wild wind
headlessagain's Avatar
Looking good Dave
Feb 23, 2020, 09:25 PM
just Some Useless Geek
210 grams is rockin' light, Dave. Proud of you, man. Keep showing the yoot how it's done.
Feb 24, 2020, 01:10 PM
Out Standing In The Field
RexGalore's Avatar
Originally Posted by headlessagain
Looking good Dave

Looking forward to seeing the maiden video!
Feb 24, 2020, 08:40 PM
Registered User
EasySimes's Avatar
Can't wait for the video. Must be bad weather in UK?
Feb 25, 2020, 12:27 AM
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davereap's Avatar
As usual its wet and windy... today light showers and fresh breeze... lol
My field here is too wet, and muddy, winds today are 16-18mph.. its always drizzling.. I havnt been able to fly outside all winter..
Forecast for the weekend 40mph and raining..
I have 5 models waiting on maiden flights, it does get frustrating..
However we are lucky here in Ashford...the far south east is better off than most.. and I can fly indoors once a week.

vast areas of the UK are totally flooded, with snow up country
Last edited by davereap; Feb 25, 2020 at 12:53 AM.
Feb 25, 2020, 01:00 AM
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davereap's Avatar
The paint job and a set of removable wheels has taken the weight as seen here to 232g with a 3s 450 lipo... it now got props at 239gAUW

2 5"x3" counter rotating give enough thrust for vertical... the wheels are left on for indoor flying and removable for hand launching over grass..
Ive put the model onto my Horus, so I have throttle cut and switchable differential..
Last edited by davereap; Feb 26, 2020 at 05:19 AM.
Feb 25, 2020, 01:27 PM
Registered User
Originally Posted by davereap
The paint job and a set of removable wheels has taken the weight as seen here to 232g with a 3s 450 lipo... it now got props at 239gAUW
2 5"x3" counter rotating give enough thrust for vertical...
Looks fantastic.
Feb 26, 2020, 10:53 AM
Thomas B.'s Avatar

Bicyclette de Pischoff

Georg's scratchbuilt KFm2 bicyclette.
✈ Bicyclette de Pischof Himmelsmoped Depron 650 mm (3 min 17 sec)
Feb 26, 2020, 01:53 PM
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Gregco10's Avatar
Have the fuse/hatch/motormount completed. The step is Dollar tree no paper stuck with 3m77 then packing tape covering. Name: 20200225_210208.jpg
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Feb 28, 2020, 02:14 AM
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davereap's Avatar
It works well... The model can be flown on low power at a low speed for indoors..
Bump up the throttle and its rocket fast.. good for gets smoother as it speeds up
Like the Ultrix it was based on its well agile...

This first flight got it trimmed, starting with the twin motors , I adjusted the rudder trim to get it running/rolling straight enough for a trial flight..
Then I adjusted the elevon trim in flight to get it cruising level at less than half power.. again fine trimming out the motors to get a better straight line flight
The differential , which is highly effective, was set on 50% rates and 50% expo and that needs to be lowered for finer control,

Rudder rates ..100 with 50% expo...50 with 50% expo..and 0, the zero turning off the differential...
the 50 % mid position is now turned down to a 30% rate
24inch kfm2 twin delta from 8mm EPP 3S 450 trimming (8 min 1 sec)
Last edited by davereap; Mar 02, 2020 at 01:05 AM.
Feb 28, 2020, 02:18 PM
Registered User
Can you run without any vertical stabilizers using the differential thrust setup for yaw stability?
Feb 28, 2020, 11:07 PM
flyin' fool
goldguy's Avatar
Do you have the torque steer feature of the E-flite design?
Feb 29, 2020, 01:41 AM
Registered User
davereap's Avatar
torque steer ? what do you mean?
it turns using differential, or bank and yank..
I have got to reduce the lower rates for the rudder , at 50% its still much too strong..
and I need to raise the 0% a tiny fraction to enable easier balancing of the motor speeds when basically the differential is off.. or perhaps there is another way..perhaps one of the many trims..

no stabilisers... I have flown KF wings with no fins, They are fairly stable... but my fins are glued on, so I wont be trying that any time soon...
However visibility with no fins is much reduced, edge on even bigger models can be difficult to see at distance.. And the fins do make any model fly better
I put the tip fins back on my fin less V wing
Last edited by davereap; Feb 29, 2020 at 01:50 AM.
Feb 29, 2020, 03:44 AM
flyin' fool
goldguy's Avatar
The E-Flite Ultrix has a torque steer feature, as in you can speed up/slow down one or the other motors with the rudder stick. Hence the instant crazy flat spins, the super easy prop hanging feature and nasty violent snaps that you can pull off.
Last edited by goldguy; Feb 29, 2020 at 12:56 PM.

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