That Happymodel Larva-x is a great value bind and fly ultralight toothpick-style quad which I reviewed and provided and improved tune for here. This is their first model to come without a battery which is due to the fact that many international shipping suppliers are banning lipo batteries from shipment. Stock propellers are the Emax Avan Rush 2.5 but due to supply issues HQ Prop 2.5x2.5x3 are also included as spares. My full review is here where I flew almost exclusively on the HQ 2.5x2.5x3, not because they were necessarily better but because they were less stiff and transmit less impact to what is a relatively weak motor (see my review for more details including a response from Happymodel).
If you're new here you'll find I'm never satisfied with status quo and like to tinker. Propellers and batteries are dispoable items so I've chosen to share the outcome of my tinkering with these. What I did find however is that this quad is very sensitive to these combinations and although some improvements can be had, there are also some very poor combinations that are inefficient and noisy with less than stellar performance.
HQ T65 - In practice
Firstly, as you can see from the images above, the HQ T65mm props are a full 2.5g lighter across the set compared to the HQ 2.5x2.5x3. This is a lot of weight (5% in fact) for such a small quad. If you are brave enough to use these without screws you can acutally save another 2g total.
As expected 2s was too slow on this prop: low motor kv, low prop pitch and only 2 blades means that this is not worthwhile on 2s unless you simply want maximum endurance.
On 3s these props are fast but they are not as good as I thought and here's why:
300mah 3s is about right - it's quieter (not as quiet as 3 blade) and it is easier to tune. You will need a good battery though and I strongly recommend the GNB HV 80c 3s 300mah rather than the Tattu 3s 300mah I was using. If you can perservere you'll be rewarded with some impressive speed. I only had a brief play but you can see my results in the DVR below.
I think these will be my prop of choice moving forward. They just seem to offer so much more versatility on this particalur setup and for me the advantages as listed below certainly outweigh the surprisngly small disadvantage in speed and efficiency:
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Here's all the parts mentioned in my review: