# Boris eFoil attempt: planing but not flying
**URL:** https://foil.zone/t/boris-efoil-attempt-planing-but-not-flying/12934
**Category:** Builds
**Created:** [June 23, 2021, 5:05am UTC](https://foil.zone/t/boris-efoil-attempt-planing-but-not-flying/12934 "2021-06-23T05:05:59Z")
**Posts on this page:** 5
**Page:** 2
### Author:  [@smus](https://foil.zone/u/smus)
#### Post date: [November 2, 2021, 7:30pm UTC](https://foil.zone/t/boris-efoil-attempt-planing-but-not-flying/12934/21 "2021-11-02T19:30:46Z")
Interesting point. There might be some weird fluid dynamics issues there too.
How is yours build going? Looks like the FR prop? Did you manage to get flying?
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### Author:  [@smus](https://foil.zone/u/smus)
#### Post date: [August 30, 2022, 1:19am UTC](https://foil.zone/t/boris-efoil-attempt-planing-but-not-flying/12934/22 "2022-08-30T01:19:56Z")
Quick update. I have very little time because two young kids, but did manage to get back on the foil this summer.
Some tweaks WRT OP:
- Cleaned up the wires in the back (read: duct-taped)
- Removed the duct completely.
- Installed a much more reliable fully mechanical kill switch (see thread)
Results:
- I am no longer overheating, able to go ~2mi on one charge (just 6Ah)
- Went quite a bit faster, peaking at 21 km/h, still not planing!
Open questions:
- I still don’t have great analytics since telemetry is being sent to the remote, and there’s no logging for later as far as I can tell.
- Should I get a new prop? Am eyeing these props: [Flipsky Motor – HighFly - WaterSports](https://highfly-watersport.com/collections/flyipsk)
- Maybe it’s my wingset? I really should be getting up at this speed. I’m definitely planing but also definitely not on the wing.
- Any tips for batteries? I was going to upgrade to a pair of these to go to 20Ah, but they’re out of stock again: [https://hobbyking.com/en\_us/turnigy-high-capacity-battery-20000mah-6s-12c-drone-lipo-pack-xt90.html?wrh\_pdp=2](https://hobbyking.com/en_us/turnigy-high-capacity-battery-20000mah-6s-12c-drone-lipo-pack-xt90.html?wrh_pdp=2)
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### Author:  [@alexander1](https://foil.zone/u/alexander1)
#### Post date: [September 27, 2022, 4:07pm UTC](https://foil.zone/t/boris-efoil-attempt-planing-but-not-flying/12934/23 "2022-09-27T16:07:50Z")
> [@smus](#):
>
> - Went quite a bit faster, peaking at 21 km/h, still not planing!
— At this speed, you should be on foil already. I suspect it could be the foil set you are using. I am using a large 2100 cm2 front wing and I could get on foil at around 10 - 12 mph.
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### Author:  [@smus](https://foil.zone/u/smus)
#### Post date: [September 27, 2022, 4:51pm UTC](https://foil.zone/t/boris-efoil-attempt-planing-but-not-flying/12934/24 "2022-09-27T16:51:18Z")
Hmm. I’m using the 2019 Naish Thrust Windsurf foil. Just looked up its specs, seems substantially smaller surface area than yours (1220 cm^2).
Also expecting a FR prop soon (it shipped!), so will try to see if that makes a difference
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### Author:  [@Foliengriller](https://foil.zone/u/Foliengriller)
#### Post date: [September 28, 2022, 9:20am UTC](https://foil.zone/t/boris-efoil-attempt-planing-but-not-flying/12934/25 "2022-09-28T09:20:38Z")
I would assume the area is not the issue, more the shape of the wing - no idea what “Modified Delta Planform” means; but it’s clearly not saying “high lift” as for most of the others…
A lot of people are using the Gong curve MT which has only 1150cm² which flies aroun 16-18km/h.
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