×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# Can Cessna trap the Otter?

## Can Cessna trap the Otter?

(OP)
In my news feed this week:

http://txtav.com/en/newsroom/2017/11/textron-aviat...

This doesn't sound like good news for Viking Air, which is struggling to keep the Twin Otter line alive.

The key seems to be the endorsement of FedEx, but it seems to me several things had to be done to get FedEx on board:
• Fit a 64" LD3 container in the cabin (and through the loading door)
• Fuel in the wing, not in the belly
• No short-field take-off/landing capability
Does this kill the Twin Otter?

STF

### RE: Can Cessna trap the Otter?

I can't understand why they didn't just go with a 12,499 lb airframe that looks like a bigger version of the Caravan, you can get 3 LD3 cans in an airframe that big & the single engine cost verse twin engine would more than cover any payload loss.

I can't see this directly killing the Otter, but they are pretty vague on detail.
Where does the passenger bags go & are they loaded through the same door as the passengers (big pain in the ass).
What keeps the cans out of the cockpit, nets need a lot of space.
Is it pressurized don't think its likely is but it would really open up the market if it is. As then it would be a replacement for J31/32 series, Sa227 & 1900 series plus numerous cessna & piper twins otherwise it is a somewhat crowded market (Technam, Beechcraft, Dornier, Otter). FedEx apparently really don't like buying airframes with passenger windows or even seeing presentations with airframe models with windows.

### RE: Can Cessna trap the Otter?

The other thing Textron will be fighting , is that the development costs on the twin otter are already paid for.
B.E.

You are judged not by what you know, but by what you can do.

### RE: Can Cessna trap the Otter?

And throw in the lost design skills for small aircraft as demonstrated by two spinning events they had with the skycatcher (which were simply lack of tail).

### RE: Can Cessna trap the Otter?

(OP)

Who knows what introductory price FedEx paid, but the Cessna press release quotes an initial 5.5 million USD price, while Viking's Twin Otter now starts at 6.5M USD.
Cessna has some room to stretch. I can't see an instrument panel or avionic spec's in the brief or on the website. Kitting up with weather and nav could even the odds.

STF

### RE: Can Cessna trap the Otter?

btw, "Otter" is the DHC3, "Twin Otter" is the DHC6.

That pricing is stunning, maybe Viking should protest "dumping"; a la Boeing vs CSeries ??

But I guess the major difference is that the DHC6 was never designed for the LD3 ... I don't think it existed in the early 60s !?
Although it does have a big cargo door ?

### RE: Can Cessna trap the Otter?

(OP)
The original Otter, and the derived Twin Otter that uses the same basic fuselage, were designed to haul crates measuring roughly 4 feet wide and high. There are no standard containers that fit that space. There were no standard containers at the time of the Otter type design, as others have observed. The smallest LD that I could find was only slightly smaller than the LD3, but still far too tall to fit in the Otter cabin or through the door. A very very rough sketch of the Cessna 408 cross-section, superimposed on a fairly accurate sketch of the Otter:

STF

### RE: Can Cessna trap the Otter?

This boxy acft appears roughly similar to the Dornier Do 228 https://en.wikipedia.org/wiki/Dornier_Do_228 ... except with a T-Tail.

Cessna made an odd/complex design-choice for this new twin TPE cargo bird: a T tail is guaranteed to complicate the design... aerodynamics, structures, mechanical systems, maintenance... relative to a conventional fuselage-mounted stab. I hope Cessna didn't build-in a T-tail for reasons other than solid value-added engineering [IE: 'aesthetics']. Unfortunately another project... the Scorpion inherited twin vertical stabs... for reasons that don't necessarily add value to the design [light attack].

KC-390 [] is a new Embraer cargo and air refueling [AR] tanker with twin TFEs + a T-tail... the following incident highlights an IFE that was almost catastrophic when pitch control was compromised during a test flight... but, then similar things have happened to conventional tailed TPE transport acft [IE: 'special configuration' C-130]

Hair-raising test flight of Embraer KC-390!!
http://www.airliners.net/forum/viewtopic.php?f=10&...

Follow-on articles say that primary structure is ~undamaged; and that worst damage was limited to secondary structure... expecting this test acft was will fly again, soon, after repairs/parts-replacement.
https://www.flightglobal.com/news/articles/dubai-e...

### RE: Can Cessna trap the Otter?

tbuelna... Good point about composite airframe... and in line with the shadow-merger of Cessna and Beechcraft under Textron.

Beech has an impressive composites capability... so Cessna shouldn't have much all-composite airframe development 'pain'; and it makes 'sense' for both companies to cooperate.

Regards, Wil Taylor

o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]

### RE: Can Cessna trap the Otter?

ah yes .. the Starship ... (smile), I know Beech have done other projects with composites.

### RE: Can Cessna trap the Otter?

(OP)

#### Quote (tbuelna)

It looks like this aircraft gets better performance from using a composite airframe rather a metal airframe.

Can you show me where you saw a reference to a composite airframe? The press release from Textron says it's all-aluminum:

I wouldn't expect Cessna (or FedEx) to be keen to repeat the composite problems experienced on the Cessna 350/TTX/Corvalis/Columbia (whatever they call it) program.
Some of us will remember the 2011 in-flight wing delam during certification flight tests: https://www.flyingmag.com/news/faa-hits-cessna-25-...

I've been poking around the subject and discovered the LET 410 already has the cabin size (barely) big enough to fit one of these palletized containers. Unfortunately the door is too small (by half).

STF

### RE: Can Cessna trap the Otter?

Beechcraft Premier series jets are all-composite airframes. https://en.wikipedia.org/wiki/Beechcraft_Premier_I

NOTE.
As far as I can recall, Cessna has had relatively solid history for adhesive-bonded aluminum structure.

Regards, Wil Taylor

o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]

### RE: Can Cessna trap the Otter?

(OP)
"Solid history" yeah, I'd have to agree with that... Ever try to get the nacelle cowling off of a Cessna 425? You could call that solid, for sure. But seriously, I think Cessna is still staying away from the composite airframe world, with the sole exception of the Columbia single.

There are many important similarities in the mindsets required to build good long-term reliable adhesively bonded metallic structures and good long-term reliable all-composite structures.
But I don't think you can walk the team of people out of one building and into another, say "hey let's cure a whole new carbon wing today" and just roll up your sleeves.
I'm waiting for Tbuelna to clarify if they know something I don't about the 408 airframe (it wouldn't be the first time, or the last). Cessna is still building its bizjets from aluminum. For now I'm taking Cessna at its word: all-aluminum structure for the 408.

I'm not seeing the relationship between Beech and Cessna as clearly as others seem to. True, they both got bought by the same parent company. Does that mean there is an active cross-pollination going on? Somehow, that just sounds like business-is-business. Wouldn't it be more likely that folks at one or the other will expect their company to get sold someday, to the next musical chairs partner, so why erode the value by giving away the family secrets?

STF

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!