TBY's blog View Details
Archive for March, 2021
Posted by TBY | Mar 02, 2021 @ 07:50 AM | 7,751 Views
Hi
A mini review and some small upgrades on the Volantex Phoenix V2 2000mm Wingspan EPO glider.

My Shopping experience:
Bought the first one on Banggood. It went missing somewhere in China 😊
Banggood sent me a second one. Arrived broken☹
The third one I have ordered from https://www.der-schweighofer.at/. It’s under the name “MODSTER PHOENIX V2 2000MM” (same plane) and they had a big discount. This time, it has arrived in mint condition.

What I like:
Plug-in system for the wings on the fuselage using a snap lock (see pic.).
Flap servo is “inverted” (see pic.). You can use two standard servos for flaps with Y connection.
A lot of place in the front fuselage. Got an elevated “balcony” for the receiver (see pic.).
Plastic fuselage.

What I don’t like:
Very low-grade servos. 3 broke after few flights without any hard landings.
A bit heavy and needs about 15gr in the tail for a 3S 2200mah.
Spinner looks a bit flimsy.

Flight experience:
It flies a bit faster than Multiplex EasyGlider.
I do not think that it's very good with thermal soaring. Did not fly a lot so I am not sure about it. Please comment on this if you have other experience.

Some ideas:
Address the servos issue!
If you choose to stay with the original servos: Check servos carefully before each takeoff and
Install servo covers.
There is an opening in the rear end of the body that enables you to add a balancing weight inside the body.
I have added a tube inside the body where the wing rods are (see pic.). That prevents the rods from contacting the servo cables each time I insert them.
I have changed to Aero-naut propeller.

Bottom line, for the right price it is a very nice value for money PNP glider…
Posted by TBY | Mar 01, 2021 @ 05:38 AM | 6,955 Views
Hi
FRSKY Archer SR8 PRO has an External Voltage measurement via AIN2. The manual describes this as:
Voltage Measurement Range via AIN2 (External device): 0-36V (Battery Voltage Division Ratio: 1:10).
No other explanations for this feature.
I’ll write down my experience with this option:

The AI2, green cable, will go to the external battery +
The -, black cable, will go to the external battery -

Be aware that this receiver accepts 0-36V. It has its own voltage divider inside. Other receivers might accept lower voltage!!!!
The other issue is the Voltage Division Ratio. The manual declares 1:10 ratio. Setting this sensor up with 1:10 ratio gave me unreasonable outcome.
I have used two batteries (3s and 4s) and a multimeter and started to “play” with the values. For this receiver, the best values were a Ratio of 35 and an offset of 0.57V. Got a good voltage reading for the two measurement points that I used.
My colleague, Lior Zahavi - i3dm, suggested that the difference (ratio) is because I’m using OpenTX.

Hope that this small “how to” helps.

Please feel free to add your division ratio values and/or comment on this issue.

TNX