Official Freewing 90mm Eurofighter Typhoon EDF Jet Thread

[Evan D]

Some bad news. First the Spek batteries you have are hard cased. I won't go into what is bad about hard vs soft... they are 40*47*138 on line but you show 39mm wide so I'll go with 47*78*138 for the two.

The battery bay can fit a battery 170mm long so no problem there. They can fit 55mm high so no problem there. I had to make a block 78mm wide to test the width. I think you can just barely have a 78mm wide battery laying on the battery tray though maybe not with the battery strap. But the problem is the fuselage narrows at the top so you can't fit them in to get them to the battery tray. the width along the canopy edge is 73mm. Maybe putting in one and then trying to squeeze the other in, maybe. But also the battery strap thickness will be an issue.

Also the weight. I am balancing mine a bit aft of the book CG and the battery is all the way back, battery wires pointed aft and I added quite a bit of tail weight. As I said I'm flying 6S and 650g batteries. I think you really should shop for better fitting/ balancing/ performing batteries.


Note to Hugh, both the 6S and 8S use the same ESC.

• I own sepktrum 4S - 3200mah - 50c - 320g each. But I'm afraid the flight will be too short, what do you think ?
• I also have sepktrum 4S - 5000mah - 100c - 480g each: but they are too big according to the photo and both are too heavy (960g) what do you think ?

[Hugh Wiedman]

Hello

I plan to buy the 8S version but I need to clarify several points:

• Apart from the 4075-1350Kv (8S) motor, what are the other differences with the 6S version ?
• CG: on Motion website the manuals are the same for the 6S and the 8S, do you confirm that the CG is the same for the 2 versions ?
• What is the minimum and maximum weight that you recommend for the 2 lipos ?
• how do you hold the 2 lipos 4S - 5000mah recommended by Motion in the compartment 70mm wide and 55mm high (as indicated in the manual) ? Do you confirm these actual sizes of the lipo compartment ?

In advance Thank you for your answers

regards
Olivier

Oliver:

Good plan to get the 8S version, I love mine.
1) no other differences except ESC/Motor (which will be slightly heavier than the 6S-helping to get the CG back)
2) CG is same as there is no difference in the airframe-Although I feel the better balance point is at least 20mm aft of manual, so you will need to install the cylindrical weight it comes with in the tail extension from fuselage that you glue on (just drill out some foam to fit it in). You may also need to add extra weight to get to your desired CG
3) The lighter the better, as usual. I'm using either 2 SMC HiV 4400 4S, dimensions 30x45x140, weight 408 gr. (total 816 gr) and my preferred pack is the new 8S SMC HiV 4400 pack (no need for adapter) 58x45x140, weight 780 gr. so the compartment dimension you listed sound about right. I get 4:00 flight time with aggressive flying on the 4400's. 5000's might be a bit heavy adding at least 150 more gr. My flying buddy also has the 8S and he flew it on 2 SMC 5300's, got plenty of flight time but just not as enjoyable as with the 4400's he also now uses. SMC also makes a HiV 8S 5300 pack weighing 964 gr and is 61x50x150 that would fit nice, but you'll have to see what you like best.

You'll really enjoy this model!

[Olivier_]

Other than the EDF unit the two are the same. I think under 4000 8s is too small though it would help with fit and balance. I had to add weight using 650g batteries so you’ll probably need to too, depending on where you like to balance it. If no one answers I’ll lower mine from the ceiling and check measurements when I have the earliest opportunity.

thank you for your answer !

[Evan D]

Other than the EDF unit the two are the same. I think under 4000 8s is too small though it would help with fit and balance. I had to add weight using 650g batteries so you’ll probably need to too, depending on where you like to balance it. If no one answers I’ll lower mine from the ceiling and check measurements when I have the earliest opportunity.

[Olivier_]

That’s the only difference.

This doesn’t balance without adding tail weight even for 6S. You will have to balance the plane.

personal preference. Too light means a small mAh pack , too heavy and difficult to balance and may not fit the area.

Mine is hanging up but that sounds right.


Maybe tell us what you propose to use and we can say how it’ll fit and balance?

• I own sepktrum 4S - 3200mah - 50c - 320g each. But I'm afraid the flight will be too short, what do you think ?
• I also have sepktrum 4S - 5000mah - 100c - 480g each: but they are too big according to the photo and both are too heavy (960g) what do you think ?

[Olivier_]

Hello,
For those who have the 8S version, do you confirm the weight announced by Motion without battery: 3230g ?
I ask this because Motion lists the same weight for the 8S and 6S version.

[Evan D]

That’s the only difference.

This doesn’t balance without adding tail weight even for 6S. You will have to balance the plane.

personal preference. Too light means a small mAh pack , too heavy and difficult to balance and may not fit the area.

Mine is hanging up but that sounds right.


Maybe tell us what you propose to use and we can say how it’ll fit and balance?

[Olivier_]

Hello

I plan to buy the 8S version but I need to clarify several points:

• Apart from the 4075-1350Kv (8S) motor, what are the other differences with the 6S version ?
• CG: on Motion website the manuals are the same for the 6S and the 8S, do you confirm that the CG is the same for the 2 versions ?
• What is the minimum and maximum weight that you recommend for the 2 lipos ?
• how do you hold the 2 lipos 4S - 5000mah recommended by Motion in the compartment 70mm wide and 55mm high (as indicated in the manual) ? Do you confirm these actual sizes of the lipo compartment ?

In advance Thank you for your answers

regards
Olivier

[Evan D]

I am eagerly waiting to see what you come up with and how it works on the model. Good luck and please report back the results. And welcome to the forums.

[Fastjet57]

The overall foreplane setting schedule is a function of mainly AoA & Mach Number, so essentially open loop. There is a special set of settings for takeoff & landing (if you know this you can see the 'odd' foreplane setting undercarriage down). The foreplanes are also used for stabilisation which is closed loop through the quadruplex Flight Control System. My idea would be, with a bit of experimentation, to 'gear' the foreplane (negative) setting directly to pitch stick (which should give a relatively linear relationship to AoA).

[kallend]

Having watched many YouTube vids of the Freewing Eurofighter flying (looks terrific) I am quite amazed and astounded at the foreplane 'schedule' that has been chosen. If you look at any vid of a real Typhoon flying at moderate to high angle of attack the foreplane is very roughly the negative of the angle of attack. Freewing have basically the opposite. Also the foreplanes absolutely DO NOT work asymmetrically for roll, they only ever work symmetrically. Having worked in the BAeSystems Aerodynamics department for 10 years in the early days of Typhoon I know exactly why the real aircraft has such a (negative setting) schedule with AoA. It is for fundamental aerodynamics reasons of 1) lateral stability and control at high AoA, 2) foreplane pitch power/effectiveness at high AoA and 3) optimised drag. We tested small scale Typhoons in the wind tunnel repeatedly and a Freewing model is exactly the same but unconstrained by wind tunnel walls!! With this knowledge I want to bypass all the 'daft' foreplane mixing and do 'a correct job' in the transmitter. How can I get rid of the 'mixing board' on the jet? Are all the servo connectors available individually downstream to plug separately into a 8/10 channel receiver? Cheers in advance.

Is the canard control in the real plane open loop control, or closed loop with feedback from airflow and attitude sensors? If the latter it would be hard to emulate in the model.

[Evan D]

Just unplug the canard servos from the board and plug them into individual slots on your receiver and do your mixing, you may need an extension but it's that easy. The main wing has ribbon cables so if you want go ahead and bypass them too though it sounds like you are more concerned with the canards.

[Fastjet57]

Having watched many YouTube vids of the Freewing Eurofighter flying (looks terrific) I am quite amazed and astounded at the foreplane 'schedule' that has been chosen. If you look at any vid of a real Typhoon flying at moderate to high angle of attack the foreplane is very roughly the negative of the angle of attack. Freewing have basically the opposite. Also the foreplanes absolutely DO NOT work asymmetrically for roll, they only ever work symmetrically. Having worked in the BAeSystems Aerodynamics department for 10 years in the early days of Typhoon I know exactly why the real aircraft has such a (negative setting) schedule with AoA. It is for fundamental aerodynamics reasons of 1) lateral stability and control at high AoA, 2) foreplane pitch power/effectiveness at high AoA and 3) optimised drag. We tested small scale Typhoons in the wind tunnel repeatedly and a Freewing model is exactly the same but unconstrained by wind tunnel walls!! With this knowledge I want to bypass all the 'daft' foreplane mixing and do 'a correct job' in the transmitter. How can I get rid of the 'mixing board' on the jet? Are all the servo connectors available individually downstream to plug separately into a 8/10 channel receiver? Cheers in advance.

[chriskwlee]

Thanks Hugh for ur personal experience. I’m pretty sure that I still heard 7beeps fully charged packs but I’m willing to give it another shot. I’ll let u know if this solves it otherwise back to the drawing board.

[Hugh Wiedman]

I got the 8S PNP Eurofighter which comes with the new FW 120A esc. After connecting to the batts (2nos. 4S w/Y-cable), it only beeps 7 times. I've tried changing ESC parameters but can not find the "8S" option. So is my ESC faulty or is the "Auto" feature messed up? If 7beeps is correct in that it means it recognises an 8s setup then I'll settle for that. However, if not, what do I need to do to make it recognise 8S (btw, there is no option for 8S in the pregrammable state).

Are you plugging in fully charged 8S batteries? I'm using the new SMC HiV 8s 4400 packs charged to 4.35 V per cell and when plugged in at a storage charge of 3.8 V per cell, the ESC only beeps 7 times (thinking it's a fully charged 7S), however, when plugged in fully charged packs, it beeps 8 times. Same with my other pack options of using 2 SMC 4S HiV 4400's. So I'll wager it beeps 8 times when you plug in a fully charged pack/packs.

[Evan D]

I don't know where to get the manual for the FreeWing version but this is a link for the original HobbyWing version. It may help.

HW-SM100DUL-V3.1_FlyFun-V5_180712 (shopify.com)

[chriskwlee]

I got the 8S PNP Eurofighter which comes with the new FW 120A esc. After connecting to the batts (2nos. 4S w/Y-cable), it only beeps 7 times. I've tried changing ESC parameters but can not find the "8S" option. So is my ESC faulty or is the "Auto" feature messed up? If 7beeps is correct in that it means it recognises an 8s setup then I'll settle for that. However, if not, what do I need to do to make it recognise 8S (btw, there is no option for 8S in the pregrammable state).

[kallend]

I bought one this week from AmainHobbies. Why MRC don't sell it instead of offering one that doesn't work?

"It is a riddle, wrapped in a mystery, inside an enigma"; Winston Churchill.;

[Coconut]

I bought one this week from AmainHobbies. Why MRC don't sell it instead of offering one that doesn't work?

[kallend]

Out of curiosity I checked the default settings of the reversible 6S 120A ESC in the new Eurofighter. (The ESC's programming lead is quite difficult to access, being short and tucked under the ESC which itself is hard to access).

It comes with reverse enabled (obviously, but unlike the Hobbywing default for stand-alone ESCs) and 20 degree timing. There are 8 timing levels available, from zero to 30 degrees. I left mine at 20. LVC is at 2.8V/cell by default which is pretty low, but you don't want the ESC cutting out due to a tired pack with high IR. Everything else is what you'd expect.

I'd recommend getting the Hobbywing LED programming box, it's inexpensive and allows you easily to check on what you have, and make changes if you wish. I got mine in 4 days from Hobbywing Direct. It works with the 100A ESCs in the new Avanti and other updated 80mm FW jets too. https://www.hobbywingdirect.com/products/led-pc2c

You can program these new reversible ESCs from the transmitter but it's more awkward and doesn't tell you what the ESC's current settings are.



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