Spezis Racewhoop - world first light whoop 17.2 g / 35mm props
Check out my previous mod:
https://rotorbuilds.com/build/30190

Note: For this Mod you have to do cutouts at the ducts. Many competitions (Igow, Racegow, US Races) only accept fully ducted whoops. This whoop does not have the requirements for some competitions. If you also want to compete, check out my Pusher Mod. https://rotorbuilds.com/build/30190

This is the lightest whoop on 35mm props.
A new mod makes it possible to fly the Meteor Pro Frame sub 20 g. This time as normal upright whoop.

Why do we need a mod?
The goal is to fly a light whoop on 35mm props. However, you can only mount Betafpv FC (external VTX necessary) in the Betafpv meteor pro frame, which is the reason for a higher weight. The frame uz65 got similiar problems and overall is not as good as the betafpv pro.

Why not mounting another fc with aio rx and vtx?
The problem is it doesn't fit in. You would have to put the flight controller higher with spacers. This causes the problem that the whole profile of the whoop gets higher which also negatively affects the center of gravity. We cut out pieces and add a printed PLA stabilization which also has new motor cable protections. With this new way it is possible that different flight controllers fits well into the frame.

Advantages of my Mod:

• Easy to reach sub 20 grams on 35 mm props !!
• you can use Happymodel FCs (Full size and Diamond FC) in meteor pro frame

What do you need?

• Meteor Pro Frame and 35mm Props
• printed 3d stl. file in pla or abs https://www.thingiverse.com/thing:5712441
• Hardware

The Mod:

• We cut out the inside of each duct where a normal full size flight controller would press on the frame. (Check out picture 4)
• Since we removed parts of the ducts the frame is very unstable. In addition, the motor cables are not protected.
• This STL: https://www.thingiverse.com/thing:5712441 is designed to bring back stability. Furthermore, these small struts protecting the motor cables of each motor. bend them slightly around the motor cables and push them inward.
• Like in the previous pusher mod we remove struts to improve airflow and save weight
• Without removing the struts, the additional weight due to the printed STL is only +0.15 g.(see pictures)
• If you also remove the struts, the weight is below that of a stoked meteor pro frame.
• place the printed PLA part in the frame (picture 4)
• build your whoop as usual
• (additionally. Did you know that there are pads under the camera connector of the Diamond FCs for soldering cameras directly? You can save about 0.3 grams by soldering the camera directly.)

Spezis Racewhoop
Since we know how the mod is done. What are the best parts?
This is my setup:

• happymodel diamond fc
• 0702 hm 26.000kv motors (--> I also recommend 0802 rcin 27.000kv)
• 2/3 nylon screws per motor
• 20 awg BT2.0 lipo cable
• runcam nano 3
• angry dons tpu mount
• meteor pro frame with 35mm gemfan props

At first it was just a test. I was skeptical if the motor cable protectors might break or get caught in the propellers. But that didn't happen once.It is important to print them in 100% infill pla or abs.
I've been flying this kind of whoop for a few days and also in one race. There were no problems. It is also very crash resistant.
As with the Pusher Mod, the combination of light weight and 35mm props feels very powerfull.

For more details follow me @ insta: https://www.instagram.com/spezi_lover/?hl=de

Thx and have fun.