Skip to main content

Electric Winch Launch for FES

The Problem

I believe in 10-20 years soaring is going to look very different than it does today...  Why?  Ops, Oil and popularity.

Here's how gliding works today in the United States... You find a club, maybe they have a "demonstration flight", but probably they don't and you have immediately fork upwards of $200 "membership fee", then you sit around the field every weekend for two months (just the nice days) and "hope" you get a ride (after all the regulars get launched for the day) if your extra lucky you get two.  To make a day happen you have to have a tow pilot, an instructor and at least a couple extra guys mulling around to crew.


In percentages...

Flying = Weather * Tow Pilot * Instructor * Tow Plane * Glider / StudentCount

That's CRAZY!

Here's a typical example;  

Flying = 60% * 80% * 80% * 0.92 * 0.98 % / 3  = 11.52%

From my experience at some clubs... that's pretty accurate.  I'm fortunate the club I'm in now is more like this...

Flying = 80% * 95% * 95% * 0.96 * 0.99 %  / 2  = 34.29%

That seems about right for any given weekend.

So no wonder it takes a year to get your private pilot glider.  That's crazy!

We can eliminate some factors in this equation...

Flying = Weather * Instructor * Glider / StudentCount

The IDEA

Front-Electric/Launch-Assist-Front  (FE/LA)

I have to admit this isn't my idea, but it makes a ton of sense.  A short 300-500' launch using a pickup truck, mini-winch or short aero-tow, then engage the FE at low-power settings to find a thermal and stay up for as long as you can.

The on-board FE system can be minimal (15-30kw), simple and reliable and you get the added benefit of being able to self-save.

Comments

Popular posts from this blog

Electric aviation

... but electric and to build it, use this... Maslow CNC Maslow CNC is a large format 2D CNC router.  It can precisely cut 48"x96"x1.5" foam sheets into fuselage slices and to cut a foam longerons to self-jig those slices precisely in place.   The wing will be constant chord for all but the wing tips.  I'll start by building the front and rear spar,  I'll jig them securely then push the entire jigged spar through a 1'-wide-full-cross-section mold to form the skin in 1' per-mold-session sections.  I will build the full-length flapperons directly into the mold connected on the top skins. When it goes all the way through... it will be ready to install less wingtips. Motor... 45kw (60hp) BLDC with 500A 120v ESC controller Last and most importantly, the battery... 20000mah 6s Battery setup in a 4S 3P configuration.  That's a net 24S 3P, good for 6.4kwh and 600A peak discharge.

Fuel tank work

I took off the right fuel tank, pulled the inspection plate and found the leak problem.  The front bracket's rivets where all not driven correctly... Just sheered a little, so the bracket was loose and mostly held in by a little rivet sheer and some tank sealer acting like glue (it's pretty strong).  Butt here's no doubt that's what caused the leak. I also made a new re-enforced backing plate.  I also added a fuel return fitting so the regulator return lines will go through my new dual fuel selector that will also direct the return lines to the tank they came from.  I also plan to add two fuel filters, one per fuel tank. For logistic reasons, I have to swap the fuel from the left to the right tank (have about 18g in the plane and jerry can).  So I can't work on both tanks at the same time.  The left tank's drain as come lose from its fitting inside the tank, so it will also need to be taken apart, I can also inspect the front tank bracket while it's out...