Official Freewing 90mm Eurofighter Typhoon EDF Jet Thread

[xviper]

When I said that ultimate speed when going more cells, won't produce that much "gain", I should have qualified that with more detail. As already discovered by "Learj" with his previous version Typhoon, he did not feel he gained much when going to 8S. The perception of "gains" is in the eye and mind of the beholder. I was also not referring to aftermarket, high zoot fans, but rather, 8s upgrades by the same manufacturer (eg, FW, FMS) because that was what Learj was asking about - 6s vs 8s version of the stock Typhoon. In my experience, going stock 8s from stock 6s did not make my planes go that much faster at my altitude (which I also stated). It was the "grunt" (or torque in car terms) that I noticed the most.
As Dougcarr posted, when he went from 6s to 8s, his plane went from 121 mph to 133 mph (in a diving run). I don't consider this to be a linear or huge increase in top speed, considering a 1/3 increase in cell count, keeping in mind that it was cell count that was spoken of. Like performance automobiles (or motorcycles), it takes an exponential increase in power to just get an arithmetic increase in top speed. (Drag goes up exponentially as speed increases.)
PS. It is my opinion (and belief) that high alpha flight can benefit from more "grunt", not higher speed capability.

[Dougcarr73]

Sorry I disagree. Most 8S versions that FW has compared to 6 will give you more speed. I do agree on grunt. The 8S pushes out more air so it will help you get off the ground. As far as the don't bother... We don't have the plane yet so we, I don't really know how well the new 6S fan in this will perform in this specific plane. I may be good or it may be not so good.

I've converted all my Freewing jets to 8s. I've even put a 6s and 3s battery in to fly it on 9s and I always get more speed and grunt than the 6s setup. For example, in this F-18 video (https://youtu.be/VSUKAARvWqI) my buddy did some fancy editing to create the illusion of a fast pass followed by an inverted gear deployment. What actually happened was a full flap touch-and-go followed by a full power squat to the vertical and then remained inverted with gear and flaps deployed the whole time (1min 5 sec mark in this video) . I could never have done that on 6s. It would've ended with a full power tail slide to a stall and faceplant into the deck... guess how I know.

This flight was with two 4s, LiHv, SMC, 5300mah packs. I plan on putting the same setup in my 8s Eurofighter.

Here are some top speeds I've hit after a dive (1350kv 8s motor):
6s - 121mph
8s - 133mph
9s - 140mph

I'm expecting the Typhoon to be faster... I hope. I don't care much about high-alpha flight, although it's cool; I mainly like to see some good high speed passes.

[kallend]

I would like an update as to when to expect delivery

As would most of us.

[TonyTaff]

I would like an update as to when to expect delivery

[Learj]

Thanks a bunch for the info. Anyone actually flying one with 8s yet?

[Evan D]

Sorry I disagree. Most 8S versions that FW has compared to 6 will give you more speed. I do agree on grunt. The 8S pushes out more air so it will help you get off the ground. As far as the don't bother... We don't have the plane yet so we, I don't really know how well the new 6S fan in this will perform in this specific plane. I may be good or it may be not so good.

If you are talking a custom 8S set up you can select a fan and motor combination designed for speed at the cost of higher amps and watts or flight time and lower stress on the motor with lower amps and watts. Watts is a pretty good determination of the thrust a plane will make. Watts is volts times amps. If you set up a 6s system at a general 100A you get about 2280W. At 8S the 100A gives you 3040W or to get the same wattage age the6S 100A system you could get a motor that would only pull 75A.

[xviper]

Hi all, is the 8s worth it? I would think the added weight would negate any gain. just curious. I plan on painting mine as I did my V2 that's still on the line and flying it is 8s as well. but I didn't gain much converting to 8s on the V2.

It depends on what you were trying to "gain". If it's speed, then no, 8S isn't going to do it. What 8S "gains" you is "grunt" - a better ability to power out of trouble if and when you get into it. I plan on flying mine with all the missiles attached. If I get into a near stall situation, I want 8S grunt to power my way out of trouble. People always seem to think that going higher cell count will make your plane go much, much faster. If that's what you are expecting to "gain", then don't bother with 8S.
I fly off grass sometimes. 8S gives me the grunt needed to power up to speed to take off from grass. I've had a few duplicate planes in the past. Where the 6S plane won't get up enough speed whille rolling agains the grass resistence, the same 8S plane will.
Oh, and the elevation at which you fly. I fly at near 3500 feet. 8S has way more push at that altitude. If you're at sea level, don't bother with 8S.

[Learj]

Hi all, is the 8s worth it? I would think the added weight would negate any gain. just curious. I plan on painting mine as I did my V2 that's still on the line and flying it is 8s as well. but I didn't gain much converting to 8s on the V2.

[Evan D]

Okay Motion, your site still says mid March. I consider early to be days 1-10, mid 10-20… that’s 11 days away so you should have an idea of when the ship comes in and when you’ll get it. Time for an update!

[Radar-Guy]

Thanks - saves me a bunch of effort.

You're welcome. Check these out, I'm glad to make changes when needed!

Here's another thought regarding tail weight. It's possible to add ballast into that tail body between the nozzles. I've already designed a slightly nicer looking replacement for the "drag chute hatch". I will make the entire rear-looking face as a 3DP part, so it would be easy to remove foam inside, add ballast and close it again with that part.

[kallend]

Just in case someone can't wait. 55mm exhaust diameter. Three different versions:
1. Simple Replacement
2. Lengthened thrust tube. The hollow can be filled with additional ballast. "Foam bearer" on fuselage needs to be removed.
3. Solid version."Foam bearer" on fuselage needs to be removed.

https://cults3d.com/en/3d-model/vari...hter-v3-nozzle

Thanks - saves me a bunch of effort.

[Radar-Guy]

Some cosmetic parts for the wingtip pods (DASS on the FSA) that Freewing omitted. I'll upload these as well when there's sufficient interest.

[Radar-Guy]

Just in case someone can't wait. 55mm exhaust diameter. Three different versions:
1. Simple Replacement
2. Lengthened thrust tube. The hollow can be filled with additional ballast. "Foam bearer" on fuselage needs to be removed.
3. Solid version."Foam bearer" on fuselage needs to be removed.

https://cults3d.com/en/3d-model/vari...hter-v3-nozzle

[kallend]

Looks like some "Kallend's Heavy Nozzles" are called for.

[Alpha10]

He said it was balanced 20mm aft of the marks and very nose heavy.

Yes, that's the video I was watching... It might need 30mm tbh? I really want to test one myself, but I don't want to buy it if that's the case haha!

The 8s fan is a BRICK and likely why it's not a severely nose heavy compared to the lighter 6s version.

[xviper]

That may explain why I don't seem to have a problem with balancing this plane.

[Evan D]

The 8S has a much larger motor and a metal fan.

[Evan D]

He said it was balanced 20mm aft of the marks and very nose heavy.

Yes, that's very strange because I've seen this plane be flown with a small 690g 6s pack all the way back to the bulkhead WITH 20g of tailweight and it's extremely nose heavy (Considering the true cg will likely be about 15-25mm aft of the manual)

[xviper]

Yes, that's very strange because I've seen this plane be flown with a small 690g 6s pack all the way back to the bulkhead WITH 20g of tailweight and it's extremely nose heavy (Considering the true cg will likely be about 15-25mm aft of the manual)

Do you have the 6s? I have the 8s. Perhaps the 8s fan is heavier? I haven't checked the weight of the 2 fans so can't say what the difference is. In this recent video from Arthur RC, you can see where his battery is (later in the video) - right at the rearmost part of the tray, up against that rear lip and the plane seems to fly quite well (aside from him chopping the centerburner light wires). He's using 70C CNHL LiPo, which tend to be on the heavy end of the scale for batteries in any size range.

[Alpha10]

Something is not quite right. I'm going fly this with twin 6000mah, 4s batteries weighing a total of about >900g and with both batteries pushed as far back as possible, I can achieve a CG of about 10mm AFT of the marks on the wing. If you use a 6s battery weighing less thatn 900g, it should not be nose heavy. When I use my twin SMC HV, I'll relocate the control box and slide one battery on it's edge up into that spot OR I'll just use that supplied cylindrical weight they provided.

Yes, that's very strange because I've seen this plane be flown with a small 690g 6s pack all the way back to the bulkhead WITH 20g of tailweight and it's extremely nose heavy (Considering the true cg will likely be about 15-25mm aft of the manual)