Still having decision troubles

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Still having decision troubles

PostPosted: Mon Sep 03, 2012 7:43 pm

I recently buy a mojo with removable wing kit. And sell a OS FS95V engine, because its weight of 650gr
Asking a lot of times to Dave McDDD tell me that is very important to use a 55AX which has an aprox weight of 525gr

So, because i also decided to buy a removable wing kit, Dave tells me that maybe at 2650 altitude 55AX won´t perform well

Said that, i´m considering to buy a YS-FZ70s or Webra 50 GT (new one) or could you people suggest me somthing?

I still want to go nitro, although Dave suggest me EP option.

Thanks

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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 7:52 pm

Unless it has changed I believe the removable wing is only an option for the 60 size Mojo. For a 60 size Mojo on glow you have to go with a Saito 100, there is no more perfect engine for it, I promise.

For a 40 size Mojo the 55AX is about as perfect as it gets, but the YS or Webra will also do just fine. They are all 3 very good engines
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 7:54 pm

40 size has removable wing option also
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 8:04 pm

Man, that 55ax is a monster. The others will probally outperform it...at leas the ys, but seriosily the 55 will be fine (and ALOT cheaper). I flew a 4lb 11oz Slide at around 5000' ASL (Doinkedit - that thing rocks) and it was not at all lacking in power, it did have a MCP on it, but those are cheap to build
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 8:05 pm

gard72977 wrote:40 size has removable wing option also


Hmm, I sure don't remember that and couldn't get to Swany's site while I was posting a few minutes ago. Thanks for the correction.
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 8:19 pm

In fact, i previously had a 55AX, but on a plane much heavier than mojo 40 or primo 40. But I want 40 Size because of his easy to transporting them
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 8:29 pm

Based on some previous correspondence with rafaxddd, a few things need to be clarified.

He is at an altitude of 2650 meters, which is 8700 feet. No matter how you look at it, that's pretty high up there.

He was trying to decide between a 65AX and a 55AX for a Mojo 40. IMHO, the 55AX is the only choice between those two engines.

He mentioned wanting to add the removable wing option. I advised against it because of the extra weight, especially at his altitude.

I own a few Webra 50 engines. They run great, but the 55AX has more power, which he will need for the high altitude.

Not sure how a YS 70 compares in power and weight to a 55AX, so I'll let someone else chime in on that one.
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 8:36 pm

Thanks Dave for the clarification. Yes, my two planes come very soon (Mojo and Primo 40), and i´m now concerned about what engine should i buy...

Thanks, seriously i want, and need to learn 3D, because my old trainers don´t do what i want and need to do...or try...

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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 8:55 pm

Wow, yeah at that altitude it would be tough to do better than a 55AX W/MCP if going glow power.

I agree with Dave that e-power would probably suit you better being at 8700' ASL.
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 9:00 pm

So, could YS FZ70s be my better option over 55AX, or 55AX could do this job, with 13x4 APC? Or even a Saito 82???

Thanks to all

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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 9:06 pm

I have both AX55 and YS70. They are about even on top end power with a proper exhaust on the 55 (not stock).
I havn't flown either above 1000'ASL but I think the 2-stroke will lose more power at altitude.
Both props lose a bunch of efficiency at that altitude.
Electric doesn't lose anything at altitude and the efficiency loss can be made up with more pitch and diameter.

At altitude like that, electric is the right answer.
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 9:08 pm

ft vs m makes a big difference, like thumbskull said -go E :gay:
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 9:10 pm

Even although i will try with 20/20 Fuel?

ThumbSkull wrote:I have both AX55 and YS70. They are about even on top end power with a proper exhaust on the 55 (not stock).
I havn't flown either above 1000'ASL but I think the 2-stroke will lose more power at altitude.
Both props lose a bunch of efficiency at that altitude.
Electric doesn't lose anything at altitude and the efficiency loss can be made up with more pitch and diameter.

At altitude like that, electric is the right answer.
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 9:15 pm

40% nitro won't make up the difference.
If I had to pick a glow engine for that altitude, there isn't a better option than the YS70 on 30/20. It might work with a 14x6 Xoar.
Given your geographic challenge, I'd still go electric and I love my YS70.
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 9:19 pm

About your YS70 Experience, could you please tell me some things like:

1) Durability (what broken parts, loosening parts, leakages, etc.)
2) Tuning
3) Spare parts at LHS (Valves, cranlshaft, anything tha you probably broke accidentaly)

Thanks, i appreciate a lot your inputs

RafaxDDD

ThumbSkull wrote:40% nitro won't make up the difference.
If I had to pick a glow engine for that altitude, there isn't a better option than the YS70 on 30/20. It might work with a 14x6 Xoar.
Given your geographic challenge, I'd still go electric and I love my YS70.
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 9:26 pm

8700?
Go electric, G32 with an APC 15x6 to start, you are probably going to be able to use a 15x7 on hot days to compensate.

No glow engine will match the performance of the E setup at that altitude.
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 9:31 pm

gus wrote:8700?
Go electric, G32 with an APC 15x6 to start, you are probably going to be able to use a 15x7 on hot days to compensate.

No glow engine will match the performance of the E setup at that altitude.


That last statement is important enough that it needs to be repeated.

No glow engine will match the performance of the E setup at that altitude.
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 9:32 pm

gus wrote:8700?
Go electric, G32 with an APC 15x6 to start, you are probably going to be able to use a 15x7 on hot days to compensate.
No glow engine will match the performance of the E setup at that altitude.

That's what I suggest but he's insisting on glow.

You won't find ANY engine spare parts at most LHS unless you live near central hobbies, horizon, or amain.
I've got just over a gallon and a half through my 70 and it's settling in nicely.
Tuning is easy and holds well once it's broken in.
These new YS engine have only two adjustments like most others HSN and LSN. The new regulators are non-adjustable.
Central hobbies and ysengines.net carry the full line of YS parts.
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 9:41 pm

I just don´t want to go electric not for been fool but in my country (because restrictions on postal services) lipo´s are very expensive. As an example, if a 14.8V Lipo at 4000 mah costs 30-60USD´s in Mexico will cost 80-150 USD´s not considering shipping and handling...So, if two lipos cost to me 300 USD´s, i do prefer to buy YS or two 55AX, but still need to know about your experience people...

Thanks to all, you´re very kind people,
maybe i will buy a YS and 55AX..
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Re: Still having decision troubles

PostPosted: Mon Sep 03, 2012 9:55 pm

I can understand wanting to use a glow engine instead of E-power. I feel the same way. There is something about the sound of the engine and the smell of the exhaust that adds to the enjoyment of flying that the electric planes simply can't match.

If maximum 3D performance is your goal, then electric power is really your only choice at 8700 feet.......period.

If glow power is your goal, and you are willing to settle for less than maximum 3D performance, then a 55AX or a YS 70 are your two best options. You should still have enough power for 3D flying, but the plane will probably feel underpowered most of the time. The 65AX will be more powerful, but the extra weight of that engine will kill the 3D flying capabilities of the plane itself.
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