DAG120 Build - Page 2 - RC Groups
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May 30, 2018, 04:48 PM
BigTradioman's Avatar
First engine start and tune up today. All went very well with the NGH 38 Fs, it sounds really nice and suitable. Taxi trials followed and a to do list compiled.
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Jun 10, 2018, 11:05 AM
BigTradioman's Avatar
As reported elsewhere all did not go to perfectly to plan with the 2cnd and 3rd taxi trials. This is often the way with these large models. On the the 3rd outing the DAG popped off the ground and as I was instructed by the owner during pre flight not to do any circuits, the throttle was closed and the model deposited into the standing crop off barley at less than walking speed. However the crop grabbed the undercart and lifted the tail. 2 blades where stopped by the crop but the 3rd blade struck the fuz in front of tail plane and smashed it off.
6 hours later the mess was repaired, reinforced with glass fiber and ready for recovering. At least we now the blades work!

Mods now done include: strengthening the undercarriage to take the landing loads, modifying to the carb intake to inside the fuz, this will enable the cowl to be fitted as at the moment the engine does not like the set up. Bigger prop to utilize the huge torque of the motor.

Next we will take it to a club with a longer and flatter flying site for some more trimming hops.

Attached are some pictures pre flight
Jun 10, 2018, 12:04 PM
Registered User
106flyer's Avatar
Wow it's a monster but looks fantastic !!!!!

Jun 10, 2018, 12:52 PM
What could possibly go wrong!!
Bring it to OW for some test hops.............and maybe more!

Jun 10, 2018, 03:33 PM
BigTradioman's Avatar

DAG120 Build

Thats the plan Chas, I will let you know in advance so we have a witness and a video of the event.
Last edited by BigTradioman; Jun 11, 2018 at 03:04 AM.
Jun 10, 2018, 03:34 PM
BigTradioman's Avatar
Originally Posted by 106flyer
Wow it's a monster but looks fantastic !!!!!

the pictures dont do it justice. John has done a great job of inventive engineering and building.
Jun 10, 2018, 04:58 PM
The 1st Sofaman
Sofaman NJ's Avatar
What a gorgeous DAG-120!!!! Well done sir!
Jun 11, 2018, 12:54 AM
What could possibly go wrong!!
Originally Posted by BigTradioman
Thats the plan Chas, I will let you know in advance son we have a witness and a video of the event.
Camera is on charge
Jun 22, 2018, 01:40 AM
BigTradioman's Avatar
See Another DAG But This Is A DAG 120
Jun 22, 2018, 01:41 AM
BigTradioman's Avatar
After the small matter of the blade chopping through the fuz, the rebuild and recover is now complete. Also modifications to the carb intake which is now ducted to the interior of the fuz behind the firewall. This means that there is no change to the engine tune cowl on or off. This was done using parts scavenged from an old Quadra and vehicle silicone heating pipe. Another benefit of this is that the intake roar is much reduced so the overall Lisa levels are now down to around 84 db. We visited the patch and carried out some further taxi trials and to test the blade spin up in a 18 mph wind. Conclusions are that the tail wheel still needs work to keep it tracking, ground handling is not great, maybe a car steering Gyro? Blades are awesome, scary to be near. Nearly set for a proper test flight but it will need to be a bigger patch and the right wind.

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